OPAMP
[EM_Library]

Operational Amplifier (OPAMP) peripheral API. More...

Collaboration diagram for OPAMP:

Data Structures

struct  OPAMP_Init_TypeDef

Defines

#define OPA_INIT_UNITY_GAIN
#define OPA_INIT_UNITY_GAIN_OPA2
#define OPA_INIT_NON_INVERTING
#define OPA_INIT_NON_INVERTING_OPA2
#define OPA_INIT_INVERTING
#define OPA_INIT_INVERTING_OPA2
#define OPA_INIT_CASCADED_NON_INVERTING_OPA0
#define OPA_INIT_CASCADED_NON_INVERTING_OPA1
#define OPA_INIT_CASCADED_NON_INVERTING_OPA2
#define OPA_INIT_CASCADED_INVERTING_OPA0
#define OPA_INIT_CASCADED_INVERTING_OPA1
#define OPA_INIT_CASCADED_INVERTING_OPA2
#define OPA_INIT_DIFF_DRIVER_OPA0
#define OPA_INIT_DIFF_DRIVER_OPA1
#define OPA_INIT_DIFF_RECEIVER_OPA0
#define OPA_INIT_DIFF_RECEIVER_OPA1
#define OPA_INIT_DIFF_RECEIVER_OPA2

Enumerations

enum  OPAMP_TypeDef {
  OPA0 = 0,
  OPA1 = 1,
  OPA2 = 2
}
enum  OPAMP_NegSel_TypeDef {
  opaNegSelDisable = DAC_OPA0MUX_NEGSEL_DISABLE,
  opaNegSelUnityGain = DAC_OPA0MUX_NEGSEL_UG,
  opaNegSelResTap = DAC_OPA0MUX_NEGSEL_OPATAP,
  opaNegSelNegPad = DAC_OPA0MUX_NEGSEL_NEGPAD
}
enum  OPAMP_PosSel_TypeDef {
  opaPosSelDisable = DAC_OPA0MUX_POSSEL_DISABLE,
  opaPosSelDac = DAC_OPA0MUX_POSSEL_DAC,
  opaPosSelPosPad = DAC_OPA0MUX_POSSEL_POSPAD,
  opaPosSelOpaIn = DAC_OPA0MUX_POSSEL_OPA0INP,
  opaPosSelResTapOpa0 = DAC_OPA0MUX_POSSEL_OPATAP
}
enum  OPAMP_OutMode_TypeDef {
  opaOutModeDisable = DAC_OPA0MUX_OUTMODE_DISABLE,
  opaOutModeMain = DAC_OPA0MUX_OUTMODE_MAIN,
  opaOutModeAlt = DAC_OPA0MUX_OUTMODE_ALT,
  opaOutModeAll = DAC_OPA0MUX_OUTMODE_ALL
}
enum  OPAMP_ResSel_TypeDef {
  opaResSelDefault = DAC_OPA0MUX_RESSEL_DEFAULT,
  opaResSelR2eq0_33R1 = DAC_OPA0MUX_RESSEL_RES0,
  opaResSelR2eqR1 = DAC_OPA0MUX_RESSEL_RES1,
  opaResSelR1eq1_67R1 = DAC_OPA0MUX_RESSEL_RES2,
  opaResSelR2eq2R1 = DAC_OPA0MUX_RESSEL_RES3,
  opaResSelR2eq3R1 = DAC_OPA0MUX_RESSEL_RES4,
  opaResSelR2eq4_33R1 = DAC_OPA0MUX_RESSEL_RES5,
  opaResSelR2eq7R1 = DAC_OPA0MUX_RESSEL_RES6,
  opaResSelR2eq15R1 = DAC_OPA0MUX_RESSEL_RES7
}
enum  OPAMP_ResInMux_TypeDef {
  opaResInMuxDisable = DAC_OPA0MUX_RESINMUX_DISABLE,
  opaResInMuxOpaIn = DAC_OPA0MUX_RESINMUX_OPA0INP,
  opaResInMuxNegPad = DAC_OPA0MUX_RESINMUX_NEGPAD,
  opaResInMuxPosPad = DAC_OPA0MUX_RESINMUX_POSPAD,
  opaResInMuxVss = DAC_OPA0MUX_RESINMUX_VSS
}

Functions

void OPAMP_Disable (DAC_TypeDef *dac, OPAMP_TypeDef opa)
 Disable an Operational Amplifier.
void OPAMP_Enable (DAC_TypeDef *dac, OPAMP_TypeDef opa, const OPAMP_Init_TypeDef *init)
 Configure and enable an Operational Amplifier.

Detailed Description

Operational Amplifier (OPAMP) peripheral API.

This module contains functions to:

All OPAMP functions assume that the DAC clock is running. If the DAC is not used, the clock can be turned off when the opamp's are configured.

If the available gain values dont suit the application at hand, the resistor ladders can be disabled and external gain programming resistors used.

A number of predefined opamp setup macros are available for configuration of the most common opamp topologies (see figures below).

Note:
The terms POSPAD and NEGPAD in the figures are used to indicate that these pads should be connected to a suitable signal ground.


Unity gain voltage follower.
Use predefined macros OPA_INIT_UNITY_GAIN and OPA_INIT_UNITY_GAIN_OPA2.


                       |\
            ___________|+\
                       |  \_______
                    ___|_ /    |
                   |   | /     |
                   |   |/      |
                   |___________|
   


Non-inverting amplifier.
Use predefined macros OPA_INIT_NON_INVERTING and OPA_INIT_NON_INVERTING_OPA2.


                       |\
            ___________|+\
                       |  \_______
                    ___|_ /    |
                   |   | /     |
                   |   |/      |
                   |_____R2____|
                   |
                   R1
                   |
                 NEGPAD 


Inverting amplifier.
Use predefined macros OPA_INIT_INVERTING and OPA_INIT_INVERTING_OPA2.


                    _____R2____
                   |           |
                   |   |\      |
            ____R1_|___|_\     |
                       |  \____|___
                    ___|  /
                   |   |+/
                   |   |/
                   |
                 POSPAD 


Cascaded non-inverting amplifiers.
Use predefined macros OPA_INIT_CASCADED_NON_INVERTING_OPA0, OPA_INIT_CASCADED_NON_INVERTING_OPA1 and OPA_INIT_CASCADED_NON_INVERTING_OPA2.


                       |\                       |\                       |\
            ___________|+\ OPA0      ___________|+\ OPA1      ___________|+\ OPA2
                       |  \_________|           |  \_________|           |  \_______
                    ___|_ /    |             ___|_ /    |             ___|_ /    |
                   |   | /     |            |   | /     |            |   | /     |
                   |   |/      |            |   |/      |            |   |/      |
                   |_____R2____|            |_____R2____|            |_____R2____|
                   |                        |                        |
                   R1                       R1                       R1
                   |                        |                        |
                 NEGPAD                   NEGPAD                   NEGPAD 


Cascaded inverting amplifiers.
Use predefined macros OPA_INIT_CASCADED_INVERTING_OPA0, OPA_INIT_CASCADED_INVERTING_OPA1 and OPA_INIT_CASCADED_INVERTING_OPA2.


                    _____R2____              _____R2____              _____R2____
                   |           |            |           |            |           |
                   |   |\      |            |   |\      |            |   |\      |
            ____R1_|___|_\     |     ____R1_|___|_\     |     ____R1_|___|_\     |
                       |  \____|____|           |  \____|___|            |  \____|__
                    ___|  /                  ___|  /                  ___|  /
                   |   |+/ OPA0             |   |+/ OPA1             |   |+/ OPA2
                   |   |/                   |   |/                   |   |/
                   |                        |                        |
                 POSPAD                   POSPAD                   POSPAD 


Differential driver with two opamp's.
Use predefined macros OPA_INIT_DIFF_DRIVER_OPA0 and OPA_INIT_DIFF_DRIVER_OPA1.


                                     __________________________
                                    |                          +
                                    |        _____R2____
                       |\           |       |           |
            ___________|+\ OPA0     |       |   |\ OPA1 |
                       |  \_________|____R1_|___|_\     |      _
                    ___|_ /         |           |  \____|______
                   |   | /          |        ___|  /
                   |   |/           |       |   |+/
                   |________________|       |   |/
                                            |
                                          POSPAD 


Differential receiver with three opamp's.
Use predefined macros OPA_INIT_DIFF_RECEIVER_OPA0, OPA_INIT_DIFF_RECEIVER_OPA1 and OPA_INIT_DIFF_RECEIVER_OPA2.


                       |\
             __________|+\ OPA1
            _          |  \_________
                    ___|_ /    |    |        _____R2____
                   |   | /     |    |       |           |
                   |   |/      |    |       |   |\      |
                   |___________|    |____R1_|___|_\     |
                                                |  \____|___
                       |\            ____R1_ ___|  /
            +__________|+\ OPA0     |       |   |+/ OPA2
                       |  \_________|       |   |/
                    ___|_ /    |            R2
                   |   | /     |            |
                   |   |/      |          NEGPAD OPA0
                   |___________|
   

Define Documentation

#define OPA_INIT_CASCADED_INVERTING_OPA0
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA1).       */ \
    true,                           /* Neg pad enabled, used as signal input.  */ \
    true,                           /* Pos pad enabled, used as signal ground. */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0 in cascaded inverting amplifier mode.

Definition at line 380 of file em_opamp.h.

#define OPA_INIT_CASCADED_INVERTING_OPA1
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxOpaIn,               /* Resistor ladder input from OPA0.        */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA2).       */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal ground. */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA1 in cascaded inverting amplifier mode.

Definition at line 402 of file em_opamp.h.

#define OPA_INIT_CASCADED_INVERTING_OPA2
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxOpaIn,               /* Resistor ladder input from OPA1.        */ \
    DAC_OPA0MUX_OUTPEN_OUT0,        /* Alternate output 0 enabled.             */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal ground. */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA2 in cascaded inverting amplifier mode.

Definition at line 424 of file em_opamp.h.

#define OPA_INIT_CASCADED_NON_INVERTING_OPA0
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelR2eq0_33R1,            /* R2 = 1/3 R1                             */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA1).       */ \
    true,                           /* Neg pad enabled, used as signal ground. */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0 in cascaded non-inverting amplifier mode.

Definition at line 314 of file em_opamp.h.

#define OPA_INIT_CASCADED_NON_INVERTING_OPA1
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelOpaIn,                 /* Pos input from OPA0 output.             */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelR2eq0_33R1,            /* R2 = 1/3 R1                             */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA2).       */ \
    true,                           /* Neg pad enabled, used as signal ground. */ \
    false,                          /* Pos pad disabled.                       */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA1 in cascaded non-inverting amplifier mode.

Definition at line 336 of file em_opamp.h.

#define OPA_INIT_CASCADED_NON_INVERTING_OPA2
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelOpaIn,                 /* Pos input from OPA1 output.             */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eq0_33R1,            /* R2 = 1/3 R1                             */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    DAC_OPA0MUX_OUTPEN_OUT0,        /* Alternate output 0 enabled.             */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    true,                           /* Neg pad enabled, used as signal ground. */ \
    false,                          /* Pos pad disabled.                       */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA2 in cascaded non-inverting amplifier mode.

Definition at line 358 of file em_opamp.h.

#define OPA_INIT_DIFF_DRIVER_OPA0
Value:
{                                                                               \
    opaNegSelUnityGain,             /* Unity gain.                             */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelDefault,               /* Resistor ladder is not used.            */ \
    opaResInMuxDisable,             /* Resistor ladder disabled.               */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA1).       */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0 in two-opamp differential driver mode.

Definition at line 446 of file em_opamp.h.

#define OPA_INIT_DIFF_DRIVER_OPA1
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxOpaIn,               /* Resistor ladder input from OPA0.        */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal ground. */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA1 in two-opamp differential driver mode.

Definition at line 468 of file em_opamp.h.

#define OPA_INIT_DIFF_RECEIVER_OPA0
Value:
{                                                                               \
    opaNegSelUnityGain,             /* Unity gain.                             */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA2).       */ \
    true,                           /* Neg pad enabled, used as signal ground. */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0 in three-opamp differential receiver mode.

Definition at line 490 of file em_opamp.h.

#define OPA_INIT_DIFF_RECEIVER_OPA1
Value:
{                                                                               \
    opaNegSelUnityGain,             /* Unity gain.                             */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeAll,                  /* Both main and alternate outputs.        */ \
    opaResSelDefault,               /* Resistor ladder is not used.            */ \
    opaResInMuxDisable,             /* Disable resistor ladder.                */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    true,                           /* Pass output to next stage (OPA2).       */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA1 in three-opamp differential receiver mode.

Definition at line 512 of file em_opamp.h.

#define OPA_INIT_DIFF_RECEIVER_OPA2
Value:
{                                                                               \
    opaNegSelResTap,                /* Input from resistor ladder tap.         */ \
    opaPosSelResTapOpa0,            /* Input from OPA0 resistor ladder tap.    */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxOpaIn,               /* Resistor ladder input from OPA1.        */ \
    DAC_OPA0MUX_OUTPEN_OUT0,        /* Enable alternate output 0.              */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    false,                          /* Neg pad disabled.                       */ \
    false,                          /* Pos pad disabled.                       */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA2 in three-opamp differential receiver mode.

Definition at line 534 of file em_opamp.h.

#define OPA_INIT_INVERTING
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    true,                           /* Neg pad enabled, used as signal input.  */ \
    true,                           /* Pos pad enabled, used as signal ground. */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0/1 in inverting amplifier mode.

Definition at line 270 of file em_opamp.h.

#define OPA_INIT_INVERTING_OPA2
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eqR1,                /* R2 = R1                                 */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    DAC_OPA0MUX_OUTPEN_OUT0,        /* Alternate output 0 enabled.             */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    true,                           /* Neg pad enabled, used as signal input.  */ \
    true,                           /* Pos pad enabled, used as signal ground. */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA2 in inverting amplifier mode.

Definition at line 292 of file em_opamp.h.

#define OPA_INIT_NON_INVERTING
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eq0_33R1,            /* R2 = 1/3 R1                             */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    true,                           /* Neg pad enabled, used as signal ground. */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0/1 in non-inverting amplifier mode.

Definition at line 226 of file em_opamp.h.

#define OPA_INIT_NON_INVERTING_OPA2
Value:
{                                                                               \
    opaNegSelResTap,                /* Neg input from resistor ladder tap.     */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelR2eq0_33R1,            /* R2 = 1/3 R1                             */ \
    opaResInMuxNegPad,              /* Resistor ladder input from neg pad.     */ \
    DAC_OPA0MUX_OUTPEN_OUT0,        /* Alternate output 0 enabled.             */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    true,                           /* Neg pad enabled, used as signal ground. */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA2 in non-inverting amplifier mode.

Definition at line 248 of file em_opamp.h.

#define OPA_INIT_UNITY_GAIN
Value:
{                                                                               \
    opaNegSelUnityGain,             /* Unity gain.                             */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelDefault,               /* Resistor ladder is not used.            */ \
    opaResInMuxDisable,             /* Resistor ladder disabled.               */ \
    0,                              /* No alternate outputs enabled.           */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA0/1 in unity gain voltage follower mode.

Definition at line 182 of file em_opamp.h.

#define OPA_INIT_UNITY_GAIN_OPA2
Value:
{                                                                               \
    opaNegSelUnityGain,             /* Unity gain.                             */ \
    opaPosSelPosPad,                /* Pos input from pad.                     */ \
    opaOutModeMain,                 /* Main output enabled.                    */ \
    opaResSelDefault,               /* Resistor ladder is not used.            */ \
    opaResInMuxDisable,             /* Resistor ladder disabled.               */ \
    DAC_OPA0MUX_OUTPEN_OUT0,        /* Alternate output 0 enabled.             */ \
    _DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting.             */       \
    _DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting.        */       \
    false,                          /* No low pass filter on pos pad.          */ \
    false,                          /* No low pass filter on neg pad.          */ \
    false,                          /* No nextout output enabled.              */ \
    false,                          /* Neg pad disabled.                       */ \
    true,                           /* Pos pad enabled, used as signal input.  */ \
    false,                          /* No shorting of inputs.                  */ \
    false,                          /* Rail-to-rail input enabled.             */ \
    true,                           /* Use factory calibrated opamp offset.    */ \
    0                               /* Opamp offset value (not used).          */ \
  }

Configuration of OPA2 in unity gain voltage follower mode.

Definition at line 204 of file em_opamp.h.


Enumeration Type Documentation

OPAMP negative terminal input selection values.

Enumerator:
opaNegSelDisable 

Input disabled.

opaNegSelUnityGain 

Unity gain feedback path.

opaNegSelResTap 

Feedback resistor ladder tap.

opaNegSelNegPad 

Negative pad as input.

Definition at line 78 of file em_opamp.h.

OPAMP output terminal selection values.

Enumerator:
opaOutModeDisable 

OPA output disabled.

opaOutModeMain 

Main output to pin enabled.

opaOutModeAlt 

Alternate output(s) enabled (not OPA2).

opaOutModeAll 

Both main and alternate enabled (not OPA2).

Definition at line 97 of file em_opamp.h.

OPAMP positive terminal input selection values.

Enumerator:
opaPosSelDisable 

Input disabled.

opaPosSelDac 

DAC as input (not OPA2).

opaPosSelPosPad 

Positive pad as input.

opaPosSelOpaIn 

Input from OPAx.

opaPosSelResTapOpa0 

Feedback resistor ladder tap from OPA0.

Definition at line 87 of file em_opamp.h.

OPAMP resistor ladder input selector values.

Enumerator:
opaResInMuxDisable 

Resistor ladder disabled.

opaResInMuxOpaIn 

Input from OPAx.

opaResInMuxNegPad 

Input from negative pad.

opaResInMuxPosPad 

Input from positive pad.

opaResInMuxVss 

Input connected to Vss.

Definition at line 120 of file em_opamp.h.

OPAMP gain values.

Enumerator:
opaResSelDefault 

Default value when resistor ladder is unused.

opaResSelR2eq0_33R1 

R2 = 0.33 * R1

opaResSelR2eqR1 

R2 = R1

opaResSelR1eq1_67R1 

R2 = 1.67 R1

opaResSelR2eq2R1 

R2 = 2 * R1

opaResSelR2eq3R1 

R2 = 3 * R1

opaResSelR2eq4_33R1 

R2 = 4.33 * R1

opaResSelR2eq7R1 

R2 = 7 * R1

opaResSelR2eq15R1 

R2 = 15 * R1

Definition at line 106 of file em_opamp.h.

OPAMP selector values.

Enumerator:
OPA0 

Select OPA0.

OPA1 

Select OPA1.

OPA2 

Select OPA2.

Definition at line 70 of file em_opamp.h.


Function Documentation

void OPAMP_Disable ( DAC_TypeDef *  dac,
OPAMP_TypeDef  opa 
)

Disable an Operational Amplifier.

Parameters:
[in] dac Pointer to DAC peripheral register block.
[in] opa Selects an OPA, valid vaules are OPA0, OPA1 and OPA2.

Definition at line 207 of file em_opamp.c.

References OPA0, and OPA1.

void OPAMP_Enable ( DAC_TypeDef *  dac,
OPAMP_TypeDef  opa,
const OPAMP_Init_TypeDef init 
)

Configure and enable an Operational Amplifier.

Note:
The value of the alternate output enable bit mask in the OPAMP_Init_TypeDef structure should consist of one or more of the DAC_OPA[opa#]MUX_OUTPEN_OUT[output#] flags (defined in <part_name>_dac.h) OR'ed together.

For OPA0:
  • DAC_OPA0MUX_OUTPEN_OUT0
  • DAC_OPA0MUX_OUTPEN_OUT1
  • DAC_OPA0MUX_OUTPEN_OUT2
  • DAC_OPA0MUX_OUTPEN_OUT3
  • DAC_OPA0MUX_OUTPEN_OUT4
For OPA1:
  • DAC_OPA1MUX_OUTPEN_OUT0
  • DAC_OPA1MUX_OUTPEN_OUT1
  • DAC_OPA1MUX_OUTPEN_OUT2
  • DAC_OPA1MUX_OUTPEN_OUT3
  • DAC_OPA1MUX_OUTPEN_OUT4
For OPA2:
  • DAC_OPA2MUX_OUTPEN_OUT0
  • DAC_OPA2MUX_OUTPEN_OUT1
E.g:
init.outPen = DAC_OPA0MUX_OUTPEN_OUT0 | DAC_OPA0MUX_OUTPEN_OUT4;
Parameters:
[in] dac Pointer to DAC peripheral register block.
[in] opa Selects an OPA, valid vaules are OPA0, OPA1 and OPA2.
[in] init Pointer to a structure containing OPAMP init information.

Definition at line 268 of file em_opamp.c.

References OPAMP_Init_TypeDef::bias, OPAMP_Init_TypeDef::defaultOffset, OPAMP_Init_TypeDef::halfBias, OPAMP_Init_TypeDef::hcmDisable, OPAMP_Init_TypeDef::lpfNegPadDisable, OPAMP_Init_TypeDef::lpfPosPadDisable, OPAMP_Init_TypeDef::negSel, OPAMP_Init_TypeDef::nextOut, OPAMP_Init_TypeDef::npEn, OPAMP_Init_TypeDef::offset, OPA0, OPA1, OPAMP_Init_TypeDef::outMode, OPAMP_Init_TypeDef::outPen, OPAMP_Init_TypeDef::posSel, OPAMP_Init_TypeDef::ppEn, OPAMP_Init_TypeDef::resInMux, OPAMP_Init_TypeDef::resSel, OPAMP_Init_TypeDef::shortInputs, and SYSTEM_GetCalibrationValue().

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