Data Acquisition Optimized for Lowest Distortion, Lowest Noise, 18 bit, 1Msps Reference Design

(ACTIVE) TIPD115

Description & Features

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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
    •  


View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  



Schematic/Block Diagram

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Test Data

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Design Files

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Bill of Materials (BOM)

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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, 1MSPS, Serial Interface, microPower, True Differential-Input SAR ADC  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS9110  18-Bit, 2MSPS, 15mW SAR ADC With multiSPI™ Digital 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  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
ADS9110 Download Download
OPA333 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

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 944 13 Oct 2015 141
Selection guides (1)
Title Abstract Type Size (KB) Date Views
PDF 9699 22 Mar 2017 860
Design files (3)
Title Abstract Type Size (KB) Date Views
ZIP 354 20 Sep 2013 12
PDF 71 20 Sep 2013 14
PDF 31 20 Sep 2013 58
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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