20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate
TIDA-01037
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Key Document

Description

TIDA-01037 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design that utilizes two different isolator devices to maximize signal chain SNR and sample rate performance. For signals requiring low jitter, such as ADC sampling clocks, TI’s ISO73xx family of low jitter devices are used whereas TI’s high speed ISO78xx family of devices are used to maximize data sample rate. By combing these two isolator solutions, high frequency performance is significantly improved by minimizing sample clock jitter across the isolation boundary, and data throughput is improved by maximizing isolator signaling rate. Additional improvements are realized by utilizing TI’s advanced ADC multiSPITM and source-synchronous features. Finally, all key design theories are described and measured results presented.

Features
  • Differential input, isolated, 20-bit, 1-MSPS, Data Acquisition (DAQ) reference design
  • Optimized isolator solution for input signals up to 100 kHz
  • Additional jitter mitigation circuitry not required
  • Demonstrates low SPI clock rates with the TI’s innovative multiSPI™ and source-synchronous  mode ADC digital interfaces
  • Provides capaility to evaluate system SNR performance due to sample clock jitter
  • Includes theory, calculation, component selection, PCB design and measurement results

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Design Files

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TI Devices (15)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8900B  20-Bit, 1-MSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO1541  2.5-kVrms isolated unidirectional clock, bidirectional I2C isolator  Isolated interfaces  Sample & Buy View Design Kits & Evaluation Modules
ISO7840  High-immunity, 100-Mbps, 5.7-kVRMS reinforced quad-channel 4/0 digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7842  5.7-kVrms, 100-Mbps, reinforced 4-channel 2/2 digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LMK61E2  Ultra-Low Jitter Fully Programmable Oscillator, Integrated EEPROM, +/-50ppm  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
LMZ14203  SIMPLE SWITCHER® 6V to 42V, 3A Power Module in Leaded Surface Mount TO Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5050  3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN65LVDS4  500-Mbps LVDS single high-speed transceiver  Interface  Sample & Buy View Design Kits & Evaluation Modules
SN74AHC1G04  Single Inverter Gate  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G08  Single 2-Input Positive-AND Gate  Gate  Sample & Buy View Design Kits & Evaluation Modules
THS4551  Low Noise, Precision, 150MHz, Fully Differential Amplifier  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-IQ wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36-V, 1-A, 4.17-μVRMS, RF low-dropout (LDO) voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8900B Download
ISO1541 Download Download
ISO7840 Download Download
SOIC (DWW)| 16 Download
ISO7842 Download Download
SOIC (DWW)| 16 Download Download
LMK61E2 Download Download
LMZ14203 Download Download
OPA376 Download Download
Download Download
Download Download
REF5050 Download Download
Download Download
SN6501 Download Download
SN65LVDS4 Download -
SN74AHC1G04 Download Download
Download Download
Download Download
SN74LVC1G08 Download Download
Download Download
Download
Download Download
Download -
Download Download
Download Download
THS4551 Download
Download -
Download Download
TPS709 Download
Download
TPS7A47 Download Download

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Technical Documents

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

Datasheet (1)
Title Type Size (KB) Date
PDF 3373 29 Jun 2017
Application notes (2)
Title Type Size (KB) Date
PDF 867 19 Sep 2016
PDF 199 23 May 2007
User guides (1)
Title Type Size (KB) Date
PDF 2173 27 Jan 2016
Design files (6)
Title Type Size (KB) Date
ZIP 496 16 Dec 2016
ZIP 4863 16 Dec 2016
PDF 5793 16 Dec 2016
PDF 973 16 Dec 2016
PDF 235 16 Dec 2016
PDF 2218 16 Dec 2016
Related Tools & Software

Reference Designs  ( 11 )

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
ADS8900B Fully-Differential Input, 20-Bit SAR ADC EVM Performance Demonstration Kit (PDK)  ADS8900BEVM-PDK  Evaluation Modules & Boards 

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