Data Acquisition for 10kHz AC, 35mW, 18 bit, 1Msps Reference Design
TIPD113
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Key Document

Description

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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Features
  • 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
  •  


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Schematic/Block Diagram

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Design Files

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8881  18-Bit, 1-MSPS, 1-ch SAR ADC with true-ifferential input, SPI interface and daisy-chain  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
OPA2320  Precision, Zero-Crossover, 20MHz, 0.9pA Ib, RRIO, CMOS Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA333  1.8-V, 17-µA, microPower, precision, zero-drift CMOS op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5045  Low Noise, Very Low Drift, Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
REF6045  5ppm/C High-Precision Voltage Reference with Integrated High-Bandwidth Buffer  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
THS4281  Very Low-Power High Speed Rail-To-Rail Input/Output Voltage Feedback Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8881 Download Download
OPA2320 Download Download
Download Download
Download -
Download
OPA333 Download Download
Download Download
Download Download
REF5045 Download Download
Download Download
REF6045 Download Download
THS4281 Download Download
Download Download
Download Download

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Technical Documents

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 1876 17 Feb 2017
Design files (3)
Title Type Size (KB) Date
PDF 99 21 Feb 2017
PDF 174 21 Feb 2017
ZIP 1530 20 Sep 2013
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

Software (2)



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