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TIDA-01037

20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate

Design files

TIDA-01037

Design files

Overview

TIDA-01037 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design that utilizes two different isolator devices to maximize signal chain SNR and sample rate performance. For signals requiring low jitter, such as ADC sampling clocks, TI’s ISO73xx family of low jitter devices are used whereas TI’s high speed ISO78xx family of devices are used to maximize data sample rate. By combing these two isolator solutions, high frequency performance is significantly improved by minimizing sample clock jitter across the isolation boundary, and data throughput is improved by maximizing isolator signaling rate. Additional improvements are realized by utilizing TI’s advanced ADC multiSPITM and source-synchronous features. Finally, all key design theories are described and measured results presented.

Features
  • Differential input, isolated, 20-bit, 1-MSPS, Data Acquisition (DAQ) reference design
  • Optimized isolator solution for input signals up to 100 kHz
  • Additional jitter mitigation circuitry not required
  • Demonstrates low SPI clock rates with the TI’s innovative multiSPI™ and source-synchronous  mode ADC digital interfaces
  • Provides capaility to evaluate system SNR performance due to sample clock jitter
  • Includes theory, calculation, component selection, PCB design and measurement results
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Design files & products

Design files

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

download Design guide — TIDA-01037
TIDUCM8A.PDF (2173 KB)

Reference design overview and verified performance test data

download Assembly drawing — TIDA-01037
TIDRPB2.PDF (974 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — TIDA-01037
TIDRPB1.PDF (235 KB)

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

download CAD/CAE symbol — TIDA-01037
TIDRPB4.ZIP (4863 KB)

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

download Gerber file — TIDA-01037
TIDCD17.ZIP (497 KB)

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

download PCB layout — TIDA-01037
TIDRPB3.PDF (5794 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — TIDA-01037
TIDRPB0.PDF (2219 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Power modules (integrated inductor)

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

Data sheet: PDF | HTML
LVDS, M-LVDS & PECL ICs

SN65LVDS4 — 500-Mbps LVDS single high-speed receiver

Data sheet: PDF | HTML
AND gates

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

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
Oscillators

LMK61E2 — Ultra-low jitter, EEPROM programmable oscillator for medical imaging and test and measurement

Data sheet: PDF | HTML
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
Inverting buffers & drivers

SN74AHC1G04 — Single 2-V to 5.5-V inverter

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
Digital isolators

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

Data sheet: PDF | HTML
Transformer drivers

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

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

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

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
I2C isolators

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

Data sheet: PDF | HTML

Start development

Hardware development

Evaluation board

ADS8900BEVM-PDK — ADS8900B performance demonstration kit (PDK) for fully-differential input, 20-bit, SAR ADC

TIDA-01037 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design that utilizes two different isolator devices to maximize signal chain SNR and sample rate performance. For signals requiring low jitter, such as ADC sampling clocks, TI’s ISO73xx family of low jitter (...)
EVM user’s guide: PDF | HTML
Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-01035 — 20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate TIDA-01037 — 20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate
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ADS8900BEVM-PDK — ADS8900B performance demonstration kit (PDK) for fully-differential input, 20-bit, SAR ADC

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Hardware development
Reference design
TIDA-01035 — 20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate TIDA-01037 — 20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate
TI’s Standard Terms and Conditions for Evaluation Items apply.

Technical documentation

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Top documentation Type Title Format options Date
* Design guide 20Bit, 1MSPS Isolator Optimized Data Acquisition Ref Design (Rev. A) Jan 27, 2016
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

Reference designs

REFERENCE DESIGN
TIDA-00732 — 18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate TIDA-01035 — 20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate TIDA-01036 — High-Q Active Differential Bandpass Filter Reference Design for Instrumentation Qualification 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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