nxp,opamp-fast

Description

NXP Fast slew rate Operational Amplifier (opamp_fast)

Properties

Properties not inherited from the base binding file.

Name

Type

Details

bias-current

int

 
Bias current config selection, change power consumption.
Reasons why set default value to 0:
1. Matches the value after register reset.
2. If there is no special power consumption requirement,
there is no need to change the bias current.
The actual meaning of each option:
0: Default value. Keep power consumption constant
1: Reduce power consumption to 1/4
2: Reduce power consumption to 1/2
3: Double the power consumption

Legal values: 0, 1, 2, 3

compensation-capcitor

int

 
Compensation capcitor config selection,
choose different bits to fit different gains.
The actual meaning of each option:
0: Fit 2X gains
1: Fit 4X gains
2: Fit 8X gains
3: Fit 16X gains
Reasons why set default value to 0:
1. Matches the value after register reset.

Legal values: 0, 1, 2, 3

is-reference-source

boolean

 
Indicates whether works as other OPAMPs' reference source.

functional-mode

string

 
Selects opamp functional mode.

a) differential mode

- Signals applied to both inputs
- Amplifies the difference between two input signals
- Common-mode signals are rejected
- Used in instrumentation and noise rejection
- Vout = (Rf/Rin) * (Vin2 - Vin1), where Rf is the feedback resistor
  and Rin is the input resistor, with gain (Rf/Rin)

         Rin        Rf
Vin1 --/\/\/\--*--/\/\/\-----
               |            |
               |     |\     |
               ------|- \   |
                     |   >--*-- Vout
               ------|+ /
               |     |/
               |
Vin2 --/\/\/\--*--/\/\/\-----
         Rin        Rf      |
                           GND

b) inverting mode

- Input signal applied to inverting (-) terminal
- Non-inverting (+) terminal connected to ground
- Feedback resistor connects output to inverting input
- Output is 180° out of phase with input
- Vout = (-Rf/Rin) * Vin, where Rf is the feedback resistor
  and Rin is the input resistor, s.t. gain is (-Rf/Rin)

        Rin        Rf
Vin --/\/\/\--*--/\/\/\-----
              |            |
              |     |\     |
              ------|- \   |
                    |   >--*-- Vout
              ------|+ /
              |     |/
            GND

c) non_inverting mode

- Input signal applied to non-inverting (+) terminal
- Inverting (-) terminal connected to feedback network
- Output is in phase with input
- Vout = (1 + (Rf/Rin)) * Vin, where Rf is the feedback resistor
  and Rin is the input resistor, s.t. gain is (1 + (Rf/Rin))

      Rin        Rf
 |--/\/\/\--*--/\/\/\-----
 |          |            |
GND         |     |\     |
            ------|- \   |
                  |   >--*-- Vout
        Vin ------|+ /
                  |/

d) follower mode (voltage follower or buffer)

- Special case of non-inverting amplifier
- Vout = 1 * Vin, s.t. gain is 1
- Direct feedback from output to inverting input
- Very high input impedance, very low output impedance
- Used for impedance matching

    --------------
    |            |
    |     |\     |
    ------|- \   |
          |   >--*-- Vout
Vin ------|+ /
          |/

e) standalone mode

- The opamp mode is defined by external circuitry

          |\
Vin- -----|- \
          |   >---- Vout
Vin+ -----|+ /
          |/

References:
  - https://www.electronics-tutorials.ws/category/opamp

This property is required.

Legal values: 'differential', 'inverting', 'non_inverting', 'follower', 'standalone'

programmable-gain

string-array

 
If the OPAMP supports programmable gain, then the gain of
the opamp can be changed dynamically at runtime. The gain
value needs to be one of the enumerations above.
Gain selection:
- OPAMP_GAIN_1_7  : x 1/7
- OPAMP_GAIN_1_3  : x 1/3
- OPAMP_GAIN_1    : x 1
- OPAMP_GAIN_5_3  : x 5/3
- OPAMP_GAIN_2    : x 2
- OPAMP_GAIN_11_5 : x 11/5
- OPAMP_GAIN_3    : x 3
- OPAMP_GAIN_4    : x 4
- OPAMP_GAIN_13_3 : x 13/3
- OPAMP_GAIN_7    : x 7
- OPAMP_GAIN_8    : x 8
- OPAMP_GAIN_15   : x 15
- OPAMP_GAIN_16   : x 16
- OPAMP_GAIN_31   : x 31
- OPAMP_GAIN_32   : x 32
- OPAMP_GAIN_33   : x 33
- OPAMP_GAIN_63   : x 63
- OPAMP_GAIN_64   : x 64

Legal values: 'OPAMP_GAIN_1_7', 'OPAMP_GAIN_1_3', 'OPAMP_GAIN_1', 'OPAMP_GAIN_5_3', 'OPAMP_GAIN_2', 'OPAMP_GAIN_11_5', 'OPAMP_GAIN_3', 'OPAMP_GAIN_4', 'OPAMP_GAIN_13_3', 'OPAMP_GAIN_7', 'OPAMP_GAIN_8', 'OPAMP_GAIN_15', 'OPAMP_GAIN_16', 'OPAMP_GAIN_31', 'OPAMP_GAIN_32', 'OPAMP_GAIN_33', 'OPAMP_GAIN_63', 'OPAMP_GAIN_64'

pinctrl-0

phandles

 
Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.

pinctrl-1

phandles

 
Pin configuration/s for the second state. See pinctrl-0.

pinctrl-2

phandles

 
Pin configuration/s for the third state. See pinctrl-0.

pinctrl-3

phandles

 
Pin configuration/s for the fourth state. See pinctrl-0.

pinctrl-4

phandles

 
Pin configuration/s for the fifth state. See pinctrl-0.

pinctrl-names

string-array

 
Names for the provided states. The number of names needs to match the
number of states.