Data acquisition optimized for low distortion, low noise 18-bit 1-MSPS reference design


Design files


This verified design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide the lowest noise & distortion solution for a full scale input sinewave of 10 KHz. This leads to a maximum possible value for Effective Number of Bits (ENOB) at a total power consumption of less than 50mW. The input driver for the ADC uses the fully-differential THS4521 for extremely low distortion, noise and high small signal bandwidth. The reference buffer drive utilizes a composite buffer made out of THS4281 & OPA333 to get the desired performance at lowest power consumption.

  • 18 Bit, 1Msps Sampling Rate
  • DC, 10kHz AC
  • Optimization: ENOB
  • Power: 50mW @ AVDD = 5V
  • Utilizes ADS8881 (18bit, 1Msps SAR ADC), THS4521 (Input), OPA333 + THS4281 + REF5045 (Reference)
This Verified Design Includes:
  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options
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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.

TIDR211.PDF (31 K)

Detailed schematic diagram for design layout and components

SLAC585.ZIP (959 K)

Detailed schematic diagram for design layout and components

TIDR212.PDF (71 K)

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

TIDC159.ZIP (354 K)

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


Includes TI products in the design and potential alternatives.

Precision ADCs

ADS888118-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

Data sheet: PDF | HTML
Precision ADCs

ADS911018-bit, 2-MSPS, one-channel SAR ADC with enhanced serial peripheral interface (SPI)

Data sheet: PDF | HTML
Fully differential amplifiers

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

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

THS4281Very Low-Power High Speed Rail-To-Rail Input/Output Voltage Feedback Operational Amplifier

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

OPA333Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF50454.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* User guide 18-Bit 1-MSPS DAQ Optimized for Lowest Distortion and Noise Design Guide (Rev. A) Oct. 13, 2015
Technical article Go differential to differentiate your precision design PDF | HTML Aug. 11, 2016

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

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