18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate
TIDA-00732
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Key Document

Description

This “18-bit, 2-Msps Isolated Data Acquisition Reference Design to achieve maximum SNR and sampling rate”  illustrates how to overcome performance-limiting challenges typical of isolated data acquisition system design:

  • Maximizing sampling rate by minimizing propagation delay introduced by digital isolator
  • Maximizing high-frequency AC signal chain performance (SNR) by effectively mitigating ADC sampling clock jitter introduced by the digital isolator

Features
  • 18-Bit, 2Msps, 1-Ch, differential input, isolated data acquisition (DAQ) system
  • Leverages multiSPI™ digital interface of ADS9110 to achieve 2MSPS sampling rate while maintaining a low SPI data rate
  • Source synchronous SPI data transfer mode to minimize isolator propagation delay and improve sampling rate
  • Techniques to reduce Isolator-induced jitter resulting in 12dB improvement in SNR (100kHz Fin, 2-MSPS)
  • Tested design includes theory and calculations, component selection, PCB design, and measurement results

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TI Devices (17)

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Part Number Name Product Family Sample & Buy 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
ISO1541  2.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator  Isolated interfaces  Sample & Buy View Design Kits & Evaluation Modules
ISO7840  Highest isolation rating, quad-channel, 4/0, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7842  Highest isolation rating, quad-channel, 2/2, reinforced 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) regulators  Sample & Buy View Design Kits & Evaluation Modules
OPA376  Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA378  Low-Noise, 900kHz, RRIO, Precision Operational Amplifier, Zerø-Drift Series   Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA625  High Bandwidth, High Precision, Low Noise & Distortion Amplifier SAR ADC Driver with Power Scaling  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5045  4.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN6505A  Low-noise, 1-A, 160-kHz transformer driver with soft start 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
SN74LVC1G08  Single 2-Input Positive-AND Gate  Gate  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G17  Single Schmitt-Trigger Buffer  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
TLV3012  Low-power comparator with reference (push-pull)  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS9110 Download Download
ISO1541 Download Download
ISO7840 Download Download
Download
ISO7842 Download Download
Download Download
LMK61E2 Download Download
LMZ14203 Download Download
OPA376 Download Download
Download Download
Download Download
OPA378 Download Download
Download Download
OPA625 Download Download
REF5045 Download Download
Download Download
SN6505A Download Download
SN65LVDS4 Download Download
SN74LVC1G08 Download Download
Download Download
Download
Download Download
Download -
Download Download
Download Download
SN74LVC1G17 Download -
Download -
Download Download
Download Download
Download
Download Download
Download Download
Download Download
TLV3012 Download Download
Download Download
TPS709 Download
Download
TPS7A47 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4088 01 Apr 2016
Design files (6)
Title Type Size (KB) Date
ZIP 25672 03 Jun 2016
PDF 3438 03 Jun 2016
ZIP 681 04 Apr 2016
PDF 3526 04 Apr 2016
PDF 467 04 Apr 2016
PDF 80 04 Apr 2016
Related Tools & Software

Reference Designs (12)

Name Part Number Tool Type
20-bit 1MSPS DAQ Reference Design Optimizing Power Supply Efficiency While Minimizing EMI  TIDA-01056  Reference design 
20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate  TIDA-01035  Reference design 
20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate  TIDA-01037  Reference design 
ADC Driver Reference Design Improving Full Scale THD Using Negative Supply  TIDA-01052  Reference design 
ADC Driver Reference Design Optimizing THD, Noise, and SNR for High Dynamic Range Instrumentation  TIDA-01053  Reference design 
ADC Voltage Reference Buffer Optimization Reference Design for High Performance DAQ Systems  TIDA-01055  Reference design 
Data Acquisition Optimized for Lowest Distortion, Lowest Noise, 18 bit, 1Msps Reference Design  TIPD115  Reference design 
Data Acquisition for 10kHz AC, 35mW, 18 bit, 1Msps Reference Design  TIPD113  Reference design 
Multi-Rail Power Reference Design for Eliminating EMI Effects in High Performance DAQ Systems  TIDA-01054  Reference design 
Optimized Analog Front End DAQ System Reference Design for 18 bit SAR Data Converters  TIDA-01050  Reference design 
Reference Design Maximizing Signal Dynamic Range for True 10 Vpp Differential Input to 20 bit ADC  TIDA-01057  Reference design 
Reference Design Optimizing FPGA Utilization and Data Throughput for Automatic Test Equipment  TIDA-01051  Reference design 

Hardware development (1)

Name Part Number Tool Type
ADS9110 18-Bit, 2MSPS, 15mW SAR ADC EVM Performance Demonstration Kit (PDK)  ADS9110EVM-PDK  Evaluation board 

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