Voltage & Current (Power) Measurement AFE for mV Output Sensor Interface to SAR ADC Reference Design


Design files


This reference design is a fixed-gain amplifier stage for measuring low-amplitude voltage and current inputs accurately over a wide dynamic range using SAR ADC for power measurement applications. Low-amplitude AC voltage from voltage dividers, current transformers or split-core current sensors with a 333-mV output can be accurately measured.

  • Op amp-based fixed-gain amplifier stage for voltage and current inputs with output compatible to ADS8688 input range of ±2.56 V, ±5.12 V and ±10.24 V
  • Configurations provided:
    • Voltage input with resistor divider > 1-MΩ impedance (no external PT required)
    • 333-mV AC voltage output-type current sensor interface
    • CT secondary input with burden resistor: single-ended and differential
  • Onboard programmable reference provided for single-ended measurement applications.
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUA01.PDF (3948 K)

Reference design overview and verified performance test data

TIDRFK9.PDF (1273 K)

Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRFL3.ZIP (1863 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

LCD & OLED display power & drivers

TPS65131Split-Rail Converter with Dual, Positive and Negative Outputs (750mA typ)

Data sheet: PDF | HTML
Precision ADCs

ADS868816-bit, 500-kSPS, 8-channel, single-supply SAR ADC with bipolar input ranges

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA41800.1 uV/C Drift, Quad, Low Noise, Rail-to-Rail, 36V Zero Drift Op Amp

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Power Measurement AFE for mV Output Sensors Interfaced to SAR ADC Design Guide Jun. 19, 2015

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