Data Acquisition for 10kHz AC, 35mW, 18 bit, 1Msps Reference Design


Design files


This TI 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 power solution for a full scale input sine wave of 10 KHz. At a total power consumption of less than 35mW, this design has been optimized to achieve an effective resolution greater than 16 bits. The input driver for the ADC uses the OPA320 for low power, low noise and linear rail-to-rail input and output operation. The reference buffer drive utilizes a composite buffer made out of THS4281 & OPA333 to get the desired performance at lowest power consumption.

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  • 18 Bit, 1Msps Sampling Rate
  • DC, 10kHz AC
  • Optimized for Low Power and Low Noise
  • Power: 35mW @ AVDD = 5V
  • Utilizes ADS8881 (18bit, 1Msps SAR ADC), OPA2320 (Input), THS4281 + OPA333 + REF5045 (Reference)
This verified design includes
  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options

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.

TIDR201A.PDF (174 K)

Detailed schematic diagram for design layout and components

SLAC583.ZIP (3425 K)

Detailed schematic diagram for design layout and components

TIDR202A.PDF (99 K)

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

TIDC152.ZIP (1530 K)

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


Includes TI products in the design and potential alternatives.

Precision ADCs (<=10MSPS)

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

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)

OPA2320Dual, precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

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

OPA3331.8-V, 17-µA, microPower, precision, zero-drift CMOS op amp

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
Series voltage references

REF60454.5-V, 5-ppm/°C high-precision voltage reference with integrated buffer & enable pin

Data sheet: PDF | HTML

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Support software

TIPD113 Simulation — TIDC153.ZIP (1756 K)

Technical documentation

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Type Title Date
* User guide 18-Bit, 1-MSPS Data Acquisition (DAQ) Block Optimized for Lowest Power (Rev. C) Feb. 17, 2017

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

Support & training

TI E2E™ forums with technical support from TI engineers

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