TIDA-01035

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

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

Industrial

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.

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Design guide — TIDA-01035

TIDUCM5A.PDF (2414 K)

Reference design overview and verified performance test data

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Schematic — TIDA-01035

TIDRPA5.PDF (1275 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-01035

TIDRPA6.PDF (238 K)

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

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Assembly drawing — TIDA-01035

TIDRPA7.PDF (848 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-01035

TIDRPA9.ZIP (5420 K)

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

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Gerber file — TIDA-01035

TIDCD16.ZIP (458 K)

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

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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 — Single 2-input, 1.65-V to 5.5-V AND gate

Data sheet

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Buck modules (integrated inductor)

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

Data sheet

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Digital isolators

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

Data sheet

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Digital isolators

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

Data sheet

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Fully differential amplifiers

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

Data sheet

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I2C isolators

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

Data sheet

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Inverting buffers & drivers

SN74LVC1G04 — Single 1.65-V to 5.5-V inverter

Data sheet

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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

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Linear & low-dropout (LDO) regulators

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

Data sheet

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Precision ADCs (<=10MSPS)

ADS8900B — 20-Bit, 1-MSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface

Data sheet

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Precision op amps (Vos<1mV)

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

Data sheet

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Series voltage references

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

Data sheet

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Transformer drivers

SN6501 — Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet

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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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