Three 12-Bit Data Acquisition Reference Designs Optimized for Low Power and Ultra-Small Form Factor
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Key Document


This Verified Precision Design details the design procedure, simulated results, and showcases the actual performance of a 12-bit discrete data acquisition block using the ADS7042, optimized for extremely low power, small form factor applications for the following three different optimizations: 

Optimization #1: 12 bit, 500ksps optimized for current monitoring, battery monitoring, electromyography (EMG), skin impedance, and wearable fitness

Optimization #2: 12 bit, 1Msps  optimized for hard disc drives, motor control, motor encoders, optical encoders, and optical modules

Optimization #3: 12 bit, < 1ksps optimized for tilt, gyro, pressure, temperature, gas, chemical, blood glucose, low voltage (1.8V-3.3V, JESD8-7A), and DC sensor measurements

  • Covers three different detailed implementations optimized for speed/power/performance
  • Contains Theory, Component Selection, Simulation, Schematic, PCB Layout, and Measured Performance Results for all three implementations
  • Includes detailed theory, calculations, and simulations of ADC drive circuitry
  • Demonstrated performance of ultra-low power (1mW) 12-bit SAR data acqusition
  • Features the ADS7042:  the world's smallest 12-bit SAR ADC

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Schematic/Block Diagram

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Design Files

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ADS7042 Evaluation Module


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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS7042  12-Bit 1MSPS Ultra-Low-Power Ultra-Small-Size SAR ADC With SPI Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
OPA835  Ultra Low Power, Rail to Rail Out, Negative Rail In, VFB Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS7042 Download Download
Download Download
OPA835 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 941 11 Jun 2014
Design files (4)
Title Type Size (KB) Date
ZIP 3361 08 Sep 2014
ZIP 3506 08 Sep 2014
PDF 93 06 Sep 2014
PDF 104 06 Sep 2014
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