TIDA-00732

18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate

TIDA-00732

Design files

Overview

This “18-bit, 2-Msps Isolated Data Acquisition Reference Design to achieve maximum SNR and sampling rate” illustrates how to overcome performance-limiting challenges typical of isolated data acquisition system design:

Maximizing sampling rate by minimizing propagation delay introduced by digital isolator
Maximizing high-frequency AC signal chain performance (SNR) by effectively mitigating ADC sampling clock jitter introduced by the digital isolator

Features

18-Bit, 2Msps, 1-Ch, differential input, isolated data acquisition (DAQ) system
Leverages multiSPI™ digital interface of ADS9110 to achieve 2MSPS sampling rate while maintaining a low SPI data rate
Source synchronous SPI data transfer mode to minimize isolator propagation delay and improve sampling rate
Techniques to reduce Isolator-induced jitter resulting in 12dB improvement in SNR (100kHz Fin, 2-MSPS)
Tested design includes theory and calculations, component selection, PCB design, and measurement results

Industrial

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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.

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Design guide — TIDA-00732

TIDUB85A.PDF (4088 K)

Reference design overview and verified performance test data

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Schematic — TIDA-00732

TIDRL57A.PDF (3438 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-00732

TIDRL58.PDF (80 K)

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

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Assembly drawing — TIDA-00732

TIDRL59.PDF (467 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-00732

TIDRL61A.ZIP (25672 K)

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

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Gerber file — TIDA-00732

TIDCC14.ZIP (681 K)

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

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PCB layout — TIDA-00732

TIDRL60.PDF (3526 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

ADS9110 — 18-bit, 2-MSPS, one-channel SAR ADC with enhanced serial peripheral interface (SPI)

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

Comparators

TLV3012 — Low-power comparator with reference (push-pull)

Data sheet: PDF | HTML

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

High-speed op amps (GBW ≥ 50 MHz)

OPA625 — High Bandwidth, High Precision, Low Noise & Distortion Amplifier SAR ADC Driver with Power Scaling

Data sheet: PDF | HTML

I2C isolators

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

Data sheet: PDF | HTML

LVDS, M-LVDS & PECL ICs

SN65LVDS4 — 500-Mbps LVDS single high-speed receiver

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

Linear & low-dropout (LDO) regulators

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

Data sheet: PDF | HTML

Noninverting buffers & drivers

SN74LVC1G17 — Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs

Data sheet: PDF | HTML

Oscillators

LMK61E2 — 156.250-MHz, ±50 ppm, ultra-low jitter, integrated EEPROM, fully programmable oscillator

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 op amps (Vos<1mV)

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

Data sheet: PDF | HTML

Precision op amps (Vos<1mV)

OPA378 — Low-noise, 900-kHz, RRIO, precision operational amplifier, zero-drift series

Data sheet: PDF

Series voltage references

REF5045 — 4.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML

Transformer drivers

SN6505A — Low-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies

Data sheet: PDF | HTML

Technical documentation

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	Type	Title		Date
*	Design guide	18-Bit, 2-MSPS Isolated Analog Acquisition Reference Design for Maximum SNR (Rev. A)		Apr. 01, 2016

Related design resources

Hardware development

EVALUATION BOARD

ADS9110EVM-PDK — ADS9110 18-Bit, 2MSPS, 15mW SAR ADC EVM Performance Demonstration Kit (PDK)

Reference designs

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

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

TIPD113 — Data acquisition, 10-kHz AC, 35-mW 18-bit 1-MSPS reference design

TIPD115 — Data acquisition optimized for low distortion, low noise 18-bit 1-MSPS reference design

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