20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate


Design files


The TIDA-01035 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design demonstrating how to resolve and optimize performance challenges typical of digitally isolated data acquisition systems.

  • Significantly improves high frequency AC signal chain performance (SNR  and THD) by effectively mitigating ADC  sample clock jitter across isolation boundary
  • Maximizes sample rate by eliminating/minimizing  propagation delay introduced by a digital isolator
  • Provides option to evaluate performance with and without jitter mitigation technique with jumper
  • Includes detailed timing analysis detailing the isolator’s additive jitter impact on data throughput

  • Isolated 20-bit, 1-MSPS, single channel  differential Input Data Acquisition (DAQ) system
  • Jitter mitigation technique realizes more than 18-dB  system-level SNR improvement for high frequency input signals (100 kHz Fin, 1 MSPS)
  • Reduced logic (on isolated ADC side) eliminates need for higher power and complex PLL solutions
  • Achieves 1-MSPS sampling rate while preserving low SPI CLK rates with the ADS8900B ADC’s innovative multiSPI™ and ADC-master or Source-Synchronous mode digital interfaces
  • Includes theory, calculations, component selection, PCB design and measurement results
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data

TIDRPA5.PDF (1275 K)

Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRPA9.ZIP (5420 K)

Files used for 3D models or 2D drawings of IC components

TIDCD16.ZIP (458 K)

Design file that contains information on physical board layer of design PCB

TIDRPA8.PDF (4897 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AND gates

SN74LVC1G081-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate

Data sheet: PDF
Digital isolators

ISO7840Highest isolation rating, quad-channel, 4/0, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7842Highest isolation rating, quad-channel, 2/2, reinforced digital isolator

Data sheet: PDF | HTML
Fully differential amplifiers

THS4551Low Noise, Precision, 150MHz, Fully Differential Amplifier

Data sheet: PDF | HTML
General-purpose transceivers

SN74LVC1G04Single 1.65-V to 5.5-V inverter

Data sheet: PDF
I2C isolators

ISO15412.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Power modules (integrated inductor)

LMZ14203SIMPLE SWITCHER® 6V to 42V, 3A Power Module in Leaded Surface Mount TO Package

Data sheet: PDF | HTML
Precision ADCs

ADS8900B20-bit, 1-MSPS, one-channel SAR ADC with internal VREF buffer, internal LDO and enhanced SPI

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA376Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Data sheet: PDF | HTML
Series voltage references

REF50505-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML
Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide 20-bit, 1 MSPS Isolated Data Acquisition (DAQ) Optimizing Jitter Design Guide (Rev. A) Jan. 17, 2017
Application note Fully-Differential Amplifiers (Rev. E) Sep. 19, 2016
Application note Noise Analysis In Operational Amplifier Circuits (Rev. B) May 23, 2007

Related design resources

Hardware development

ADS8900BEVM-PDK ADS8900B Fully-Differential Input, 20-Bit SAR ADC EVM Performance Demonstration Kit (PDK)

Reference designs

TIDA-00732 18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate TIDA-01036 High-Q Active Differential Bandpass Filter Reference Design for Instrumentation Qualification TIDA-01037 20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate TIDA-01050 Optimized Analog Front End DAQ System Reference Design for 18 bit SAR Data Converters TIDA-01051 Reference Design Optimizing FPGA Utilization and Data Throughput for Automatic Test Equipment TIDA-01052 ADC Driver Reference Design Improving Full Scale THD Using Negative Supply TIDA-01053 ADC Driver Reference Design Optimizing THD, Noise, and SNR for High Dynamic Range Instrumentation TIDA-01054 Multi-Rail Power Reference Design for Eliminating EMI Effects in High Performance DAQ Systems TIDA-01055 ADC Voltage Reference Buffer Optimization Reference Design for High Performance DAQ Systems TIDA-01056 20-bit 1MSPS DAQ Reference Design Optimizing Power Supply Efficiency While Minimizing EMI TIDA-01057 Reference Design Maximizing Signal Dynamic Range for True 10 Vpp Differential Input to 20 bit ADC

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