TIDA-01037

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

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

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.

TIDUCM8A.PDF (2173 K)

Reference design overview and verified performance test data

TIDRPB0.PDF (2218 K)

Detailed schematic diagram for design layout and components

TIDRPB1.PDF (235 K)

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

TIDRPB2.PDF (973 K)

Detailed overview of design layout for component placement

TIDRPB4.ZIP (4863 K)

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

TIDCD17.ZIP (496 K)

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

TIDRPB3.PDF (5793 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

AND gates

SN74LVC1G08Single 2-input, 1.65-V to 5.5-V AND gate

Data sheet: PDF
Buck modules (integrated inductor)

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

Data sheet: PDF | HTML
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
I2C isolators

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

Data sheet: PDF | HTML
Inverting buffers & drivers

SN74AHC1G04Single 2-V to 5.5-V inverter

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

SN65LVDS4500-Mbps LVDS single high-speed receiver

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
Oscillators

LMK61E2156.250-MHz, ±50 ppm, ultra-low jitter, integrated EEPROM, fully programmable oscillator

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 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

Hardware development

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

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

Support & training

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