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TIDA-01035

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

Design files

TIDA-01035

Design files

Overview

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

Features
  • 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.

download Design guide — TIDA-01035
TIDUCM5A.PDF (2414 K)

Reference design overview and verified performance test data

download Schematic — TIDA-01035
TIDRPA5.PDF (1275 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-01035
TIDRPA6.PDF (238 K)

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

download Assembly drawing — TIDA-01035
TIDRPA7.PDF (848 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-01035
TIDRPA9.ZIP (5420 K)

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

download Gerber file — TIDA-01035
TIDCD16.ZIP (458 K)

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

download PCB layout — TIDA-01035
TIDRPA8.PDF (4897 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

AND gates

SN74LVC1G08 — 1-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate

Data sheet: PDF
Digital isolators

ISO7840 — Highest isolation rating, quad-channel, 4/0, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7842 — Highest isolation rating, quad-channel, 2/2, reinforced digital isolator

Data sheet: PDF | HTML
Fully differential amplifiers

THS4551 — Low Noise, Precision, 150MHz, Fully Differential Amplifier

Data sheet: PDF | HTML
I2C isolators

ISO1541 — 2.5-kVrms, isolated unidirectional clock, bidirectional I2C isolator

Data sheet: PDF | HTML
Inverting buffers & drivers

SN74LVC1G04 — Single 1.65-V to 5.5-V inverter

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

TPS709 — 150-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

TPS7A47 — 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

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

LMZ14203 — SIMPLE SWITCHER® 6V to 42V, 3A Power Module in Leaded Surface Mount TO Package

Data sheet: PDF | HTML
Precision ADCs

ADS8900B — 20-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)

OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Data sheet: PDF | HTML
Series voltage references

REF5050 — 5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML
Transformer drivers

SN6501 — Low-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

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

Reference designs

REFERENCE DESIGN
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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