OPAMP - Operational Amplifier#

Operational Amplifier (OPAMP) peripheral API.

This module contains functions to:

OPAMP_Enable() Configure and enable OPAMP.
OPAMP_Disable() Disable OPAMP.

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

If the available gain values don't 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
                |___________|

Modules#

OPAMP_Init_TypeDef

Enumerations#

enum

OPAMP_TypeDef {

OPA0 = 0

OPA1 = 1

OPA2 = 2

}

OPAMP selector values.

enum

OPAMP_NegSel_TypeDef {

opaNegSelDisable = DAC_OPA0MUX_NEGSEL_DISABLE

opaNegSelUnityGain = DAC_OPA0MUX_NEGSEL_UG

opaNegSelResTap = DAC_OPA0MUX_NEGSEL_OPATAP

opaNegSelNegPad = DAC_OPA0MUX_NEGSEL_NEGPAD

}

OPAMP negative terminal input selection values.

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

}

OPAMP positive terminal input selection values.

enum

OPAMP_OutMode_TypeDef {

opaOutModeDisable = DAC_OPA0MUX_OUTMODE_DISABLE

opaOutModeMain = DAC_OPA0MUX_OUTMODE_MAIN

opaOutModeAlt = DAC_OPA0MUX_OUTMODE_ALT

opaOutModeAll = DAC_OPA0MUX_OUTMODE_ALL

}

OPAMP output terminal selection values.

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

}

OPAMP gain values.

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

}

OPAMP resistor ladder input selector values.

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.

Macros#

#define

OPA_INIT_UNITY_GAIN undefined

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

#define

OPA_INIT_UNITY_GAIN_OPA2 undefined

Configuration of OPA2 in unity gain voltage follower mode.

#define

OPA_INIT_NON_INVERTING undefined

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

#define

OPA_INIT_NON_INVERTING_OPA2 undefined

Configuration of OPA2 in non-inverting amplifier mode.

#define

OPA_INIT_INVERTING undefined

Configuration of OPA0/1 in inverting amplifier mode.

#define

OPA_INIT_INVERTING_OPA2 undefined

Configuration of OPA2 in inverting amplifier mode.

#define

OPA_INIT_CASCADED_NON_INVERTING_OPA0 undefined

Configuration of OPA0 in cascaded non-inverting amplifier mode.

#define

OPA_INIT_CASCADED_NON_INVERTING_OPA1 undefined

Configuration of OPA1 in cascaded non-inverting amplifier mode.

#define

OPA_INIT_CASCADED_NON_INVERTING_OPA2 undefined

Configuration of OPA2 in cascaded non-inverting amplifier mode.

#define

OPA_INIT_CASCADED_INVERTING_OPA0 undefined

Configuration of OPA0 in cascaded inverting amplifier mode.

#define

OPA_INIT_CASCADED_INVERTING_OPA1 undefined

Configuration of OPA1 in cascaded inverting amplifier mode.

#define

OPA_INIT_CASCADED_INVERTING_OPA2 undefined

Configuration of OPA2 in cascaded inverting amplifier mode.

#define

OPA_INIT_DIFF_DRIVER_OPA0 undefined

Configuration of OPA0 in two-opamp differential driver mode.

#define

OPA_INIT_DIFF_DRIVER_OPA1 undefined

Configuration of OPA1 in two-opamp differential driver mode.

#define

OPA_INIT_DIFF_RECEIVER_OPA0 undefined

Configuration of OPA0 in three-opamp differential receiver mode.

#define

OPA_INIT_DIFF_RECEIVER_OPA1 undefined

Configuration of OPA1 in three-opamp differential receiver mode.

#define

OPA_INIT_DIFF_RECEIVER_OPA2 undefined

Configuration of OPA2 in three-opamp differential receiver mode.

Enumeration Documentation#

OPAMP_TypeDef#

OPAMP_TypeDef

OPAMP selector values.

Enumerator
OPA0	Select OPA0.
OPA1	Select OPA1.
OPA2	Select OPA2.

Definition at line 80 of file platform/emlib/inc/em_opamp.h

OPAMP_NegSel_TypeDef#

OPAMP_NegSel_TypeDef

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 96 of file platform/emlib/inc/em_opamp.h

OPAMP_PosSel_TypeDef#

OPAMP_PosSel_TypeDef

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 175 of file platform/emlib/inc/em_opamp.h

OPAMP_OutMode_TypeDef#

OPAMP_OutMode_TypeDef

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 256 of file platform/emlib/inc/em_opamp.h

OPAMP_ResSel_TypeDef#

OPAMP_ResSel_TypeDef

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 335 of file platform/emlib/inc/em_opamp.h

OPAMP_ResInMux_TypeDef#

OPAMP_ResInMux_TypeDef

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 360 of file platform/emlib/inc/em_opamp.h

Function Documentation#

OPAMP_Disable#

void OPAMP_Disable (DAC_TypeDef * dac, OPAMP_TypeDef opa)

Disable an Operational Amplifier.

Parameters

[in]	dac	A pointer to the DAC peripheral register block.
[in]	opa	Selects an OPA, valid values are OPA0, OPA1, and OPA2.

Definition at line 252 of file platform/emlib/src/em_opamp.c

OPAMP_Enable#

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

Configure and enable an Operational Amplifier.

Parameters

[in]	dac	A pointer to the DAC peripheral register block.
[in]	opa	Selects an OPA, valid values are OPA0, OPA1, and OPA2.
[in]	init	A pointer to a structure containing OPAMP initialization information.

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;

Definition at line 363 of file platform/emlib/src/em_opamp.c

Macro Definition Documentation#

OPA_INIT_UNITY_GAIN#

#define OPA_INIT_UNITY_GAIN

Value:

{ \

opaNegSelUnityGain, /* Unity gain. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 530 of file platform/emlib/inc/em_opamp.h

OPA_INIT_UNITY_GAIN_OPA2#

#define OPA_INIT_UNITY_GAIN_OPA2

Value:

{ \

opaNegSelUnityGain, /* Unity gain. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 552 of file platform/emlib/inc/em_opamp.h

OPA_INIT_NON_INVERTING#

#define OPA_INIT_NON_INVERTING

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeMain, /* Main output enabled. */ \

opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

true, /* Negative pad enabled, used as signal ground. */ \

true, /* Positive 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 574 of file platform/emlib/inc/em_opamp.h

OPA_INIT_NON_INVERTING_OPA2#

#define OPA_INIT_NON_INVERTING_OPA2

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeMain, /* Main output enabled. */ \

opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

true, /* Negative pad enabled, used as signal ground. */ \

true, /* Positive 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 596 of file platform/emlib/inc/em_opamp.h

OPA_INIT_INVERTING#

#define OPA_INIT_INVERTING

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeMain, /* Main output enabled. */ \

opaResSelR2eqR1, /* R2 = R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

true, /* Negative pad enabled, used as signal input. */ \

true, /* Positive 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 618 of file platform/emlib/inc/em_opamp.h

OPA_INIT_INVERTING_OPA2#

#define OPA_INIT_INVERTING_OPA2

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeMain, /* Main output enabled. */ \

opaResSelR2eqR1, /* R2 = R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

true, /* Negative pad enabled, used as signal input. */ \

true, /* Positive 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 640 of file platform/emlib/inc/em_opamp.h

OPA_INIT_CASCADED_NON_INVERTING_OPA0#

#define OPA_INIT_CASCADED_NON_INVERTING_OPA0

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeAll, /* Both main and alternate outputs. */ \

opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA1). */ \

true, /* Negative pad enabled, used as signal ground. */ \

true, /* Positive 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 662 of file platform/emlib/inc/em_opamp.h

OPA_INIT_CASCADED_NON_INVERTING_OPA1#

#define OPA_INIT_CASCADED_NON_INVERTING_OPA1

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelOpaIn, /* Positive input from OPA0 output. */ \

opaOutModeAll, /* Both main and alternate outputs. */ \

opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA2). */ \

true, /* Negative pad enabled, used as signal ground. */ \

false, /* Positive 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 684 of file platform/emlib/inc/em_opamp.h

OPA_INIT_CASCADED_NON_INVERTING_OPA2#

#define OPA_INIT_CASCADED_NON_INVERTING_OPA2

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelOpaIn, /* Positive input from OPA1 output. */ \

opaOutModeMain, /* Main output enabled. */ \

opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

true, /* Negative pad enabled, used as signal ground. */ \

false, /* Positive 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 706 of file platform/emlib/inc/em_opamp.h

OPA_INIT_CASCADED_INVERTING_OPA0#

#define OPA_INIT_CASCADED_INVERTING_OPA0

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeAll, /* Both main and alternate outputs. */ \

opaResSelR2eqR1, /* R2 = R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA1). */ \

true, /* Negative pad enabled, used as signal input. */ \

true, /* Positive 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 728 of file platform/emlib/inc/em_opamp.h

OPA_INIT_CASCADED_INVERTING_OPA1#

#define OPA_INIT_CASCADED_INVERTING_OPA1

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA2). */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 750 of file platform/emlib/inc/em_opamp.h

OPA_INIT_CASCADED_INVERTING_OPA2#

#define OPA_INIT_CASCADED_INVERTING_OPA2

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 772 of file platform/emlib/inc/em_opamp.h

OPA_INIT_DIFF_DRIVER_OPA0#

#define OPA_INIT_DIFF_DRIVER_OPA0

Value:

{ \

opaNegSelUnityGain, /* Unity gain. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA1). */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 794 of file platform/emlib/inc/em_opamp.h

OPA_INIT_DIFF_DRIVER_OPA1#

#define OPA_INIT_DIFF_DRIVER_OPA1

Value:

{ \

opaNegSelResTap, /* Negative input from resistor ladder tap. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 816 of file platform/emlib/inc/em_opamp.h

OPA_INIT_DIFF_RECEIVER_OPA0#

#define OPA_INIT_DIFF_RECEIVER_OPA0

Value:

{ \

opaNegSelUnityGain, /* Unity gain. */ \

opaPosSelPosPad, /* Positive input from pad. */ \

opaOutModeAll, /* Both main and alternate outputs. */ \

opaResSelR2eqR1, /* R2 = R1 */ \

opaResInMuxNegPad, /* Resistor ladder input from negative 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA2). */ \

true, /* Negative pad enabled, used as signal ground. */ \

true, /* Positive 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 838 of file platform/emlib/inc/em_opamp.h

OPA_INIT_DIFF_RECEIVER_OPA1#

#define OPA_INIT_DIFF_RECEIVER_OPA1

Value:

{ \

opaNegSelUnityGain, /* Unity gain. */ \

opaPosSelPosPad, /* Positive 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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

true, /* Pass output to next stage (OPA2). */ \

false, /* Negative pad disabled. */ \

true, /* Positive 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 860 of file platform/emlib/inc/em_opamp.h

OPA_INIT_DIFF_RECEIVER_OPA2#

#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 positive pad. */ \

false, /* No low pass filter on negative pad. */ \

false, /* No nextout output enabled. */ \

false, /* Negative pad disabled. */ \

false, /* Positive 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 882 of file platform/emlib/inc/em_opamp.h