Data Acquisition for MUX and Step Inputs, 18 bits, 1uS Full Scale Response Reference Design

(ACTIVE) TIPD112

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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 18-bit settling performance for a Full Scale Step Input signal, thus leading to excellent system linearity. Such an input stimulus is more applicable in MUXed applications for transition between channels with different input voltages. The input driver for the ADC uses the OPA350 for high bandwidth (small & large signal), output current drive 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. This DAQ block achieves a ±2.5LSB INL performance for a total power consumption of less than 70mW.

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Features
  • 18 Bit, 1Msps Sampling Rate
  • DC, MUX'ed, and Full Scale Step Inputs
  • Optimization: Transient Settling
  • Power: 70mW @ AVDD = 5V
  • Utilizes ADS8881 (18bit, 1Msps SAR ADC), OPA2350 (Input), THS4281 + OPA333 + REF5045 (Reference)


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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
OPA2350  High-Speed, Single-Supply, Rail-to-Rail Operational Amplifiers MicroAmplifier™ Series  Operational amplifiers (op amps)  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
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
OPA2350 Download Download
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OPA333 Download Download
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REF5045 Download Download
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REF6045 Download Download
THS4281 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 1796 02 Feb 2017 2
Design files (3)
Title Abstract Type Size (KB) Date Views
PDF 172 02 Feb 2017 1 1
PDF 103 02 Feb 2017 0
ZIP 1436 29 Aug 2013 0
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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