Data Acquisition Optimized for Lowest Distortion, Lowest Noise, 18 bit, 1Msps Reference Design TIPD115 (ACTIVE)

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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 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.

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Features
  • 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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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-Differential Input, SPI Interface and Daisy-Chain  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS9110  18-Bit, 2-MSPS, 1-Ch SAR ADC with Enhanced SPI Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
OPA333  1.8V, 17µA, 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
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
THS4521  Very low power rail-to-rail output fully differential amplifier  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8881 Download Download
ADS9110 Download Download
OPA333 Download Download
Download Download
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REF5045 Download Download
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THS4281 Download Download
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THS4521 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 944 13 Oct 2015
Selection guides (1)
Title Type Size (KB) Date
PDF 9699 22 Mar 2017
Design files (3)
Title Type Size (KB) Date
ZIP 354 20 Sep 2013
PDF 71 20 Sep 2013
PDF 31 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 (3)



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