Dual-channel data acquisition reference design for optical encoders, 12 bits, 1 MSPS


Design files


This TI Precision Verified Design provides the theory, component selection, simulation, PCB design, and measurement details for a 12-bit 1-MSPS single supply dual channel simultaneous data acquisition system. This circuit achieves 73 dB SINAD for a 4.5 V differential signal at 2 KHz input frequency. Differential input may have a wide range of common mode voltage. Circuit includes a low impedence buffer, low pass RC filter and 12 bit, Dual, Simultaneous Sampling SAR ADC with internal reference voltage source.

  • 12-Bit, 2-Channel, Simultaneous Data Acquisition at 1-MSPS Throughput
  • 72dB SNR, 85dB THD, 71.5dB SINAD AC Performance
  • ±4.5 V Differential Input Voltage Signal
  • Alternate component choices with measured results shown for 16-bit and 14-bit performance upgrade
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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.

SLAC587.ZIP (472 K)

Detailed schematic diagram for design layout and components

TIDR274.PDF (71 K)

Detailed schematic diagram for design layout and components

TIDR275.PDF (57 K)

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

TIDC009.ZIP (306 K)

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


Includes TI products in the design and potential alternatives.

Fully differential amplifiers

THS4521Very low power rail-to-rail output fully differential amplifier

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Fully differential amplifiers

THS4531Ultra low power 0.25mA, RRO, fully differential amplifier

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Precision ADCs

ADS725412 Bit, 1 MSPS, Dual, Simultaneous Sampling Differential SAR ADC

Data sheet: PDF | HTML
Precision ADCs

ADS7854SAR ADC, dual, differential input, 1 MSPS, 14-bit, simultaneous sampling

Data sheet: PDF | HTML
Precision ADCs

ADS8354Dual 700kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC)

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* User guide TIPD117 Verified Design Reference Guide Jun. 06, 2013
Technical article Designing an EMC-compliant interface to motor position encoders – Part 5 PDF | HTML Nov. 10, 2015
Analog Design Journal Closed-loop motor control: An introduction to rotary resolvers and encoders Apr. 11, 2014

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