Transimpedance amplifier circuit with MSP430 smart analog combo




Some MSP430™ microcontrollers (MCUs) contain configurable integrated signal chain elements such as op-amps, DACs and programmable gain stages. These elements make up a peripheral called the smart analog combo (SAC). For information on the different types of SACs and how to leverage their configurable analog signal chain capabilities, visit MSP430 MCUs smart analog combo training. To get started with your design, download the MSP430 transimpedance amplifier circuit design files. The transimpedance op amp circuit configuration converts an input current source into an output voltage. The current to voltage gain is based on the feedback resistance. The circuit can maintain a constant voltage bias across the input source as the input current changes, which benefits many sensors. The characteristics of the Transimpedance Amplifier (TIA) module in MSP430FR2311 make it especially suited for this functionality; however, this circuit can also be implemented with the MSP430FR2311 SAC_L1, or with the MSP430FR2355 SAC_L3 with additional built-in DAC and PGA capabilities. The output of these integrated amplifiers can be sampled directly by the on-board ADC or monitored by the on board comparator for further processing inside the MCU.
  • Input: I = 0 A to 30 µA
  • Output: Vo = 0.2 V to 3.2 V
  • BW: fp = 10 kHz
  • Supply:
    • Vcc = 3.3 V
    • Vee = 0 V


Design tool

MSP430 Transimpedance Amplifier Circuit Design Files SLAC804.ZIP (63KB)

Supported products & hardware

Supported products & hardware

MSP430 microcontrollers
MSP430FR2311 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2355 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Technical documentation

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Type Title Date
* Circuit design Transimpedance amplifier circuit with MSP430 smart analog combo (Rev. A) Mar. 06, 2020

Related design resources

Design tools & simulation

PSPICE-FOR-TI PSpice® for TI design and simulation tool TINA-TI SPICE-based analog simulation program
ANALOG-ENGINEER-CALC Analog engineer's calculator

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