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

(ACTIVE) 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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Design Files

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Bill of Materials (BOM)

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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, 2MSPS, 15mW SAR ADC With multiSPI™ Digital Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO1541  2.5 kVrms Isolated Unidirectional Clock, Bidirectional I2C Isolators  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7840  High-Immunity, 5.7kVRMS Reinforced Quad-Channel 4/0 Digital Isolator, 100Mbps  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  Clock & 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
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  Low Noise, Very Low Drift, Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN6505A  Low-noise 1-A, 160kHz transformer driver for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN65LVDS4  500 Mbps LVDS Single High Speed Transceiver  LVDS/M-LVDS/PECL  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  Nanopower, 1.8V, SOT23 Push-Pull Comparator with Voltage Reference  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)
ADS9110 Download 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
OPA378 Download Download
Download Download
OPA625 Download Download
REF5045 Download Download
Download Download
SN6505A Download Download
SN65LVDS4 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 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 4088 01 Apr 2016 0
Design files (6)
Title Abstract Type Size (KB) Date Views TI Recommends
ZIP 25672 03 Jun 2016 0
PDF 3438 03 Jun 2016 0
ZIP 681 04 Apr 2016 0
PDF 3526 04 Apr 2016 0
PDF 467 04 Apr 2016 0
PDF 80 04 Apr 2016 0
Related Tools & Software

Reference Designs  ( 12 )

Design Kits & Evaluation Modules  ( 1 )

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

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