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TIDA-00732

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

Design files

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
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Design files & products

Design files

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

download Design guide — TIDA-00732
TIDUB85A.PDF (4089 KB)

Reference design overview and verified performance test data

download Assembly drawing — TIDA-00732
TIDRL59.PDF (467 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — TIDA-00732
TIDRL58.PDF (81 KB)

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

download CAD/CAE symbol — TIDA-00732
TIDRL61A.ZIP (25672 KB)

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

download Gerber file — TIDA-00732
TIDCC14.ZIP (682 KB)

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

download PCB layout — TIDA-00732
TIDRL60.PDF (3526 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — TIDA-00732
TIDRL57A.PDF (3438 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

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

Data sheet: PDF
Power modules (integrated inductor)

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

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
LVDS, M-LVDS & PECL ICs

SN65LVDS4 — 500-Mbps LVDS single high-speed receiver

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
AND gates

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

Data sheet: PDF | HTML
Oscillators

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

Data sheet: PDF | HTML
Precision ADCs

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

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
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
Series voltage references

REF50 — Low-noise, very low-drift, wide-VIN precision 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
Comparators

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

Data sheet: PDF | HTML
Digital isolators

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

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

ADS9110EVM-PDK — ADS9110 performance demonstration kit for 18-bit, 2-MSPS, one-channel SAR ADC with enhanced SPI

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 (...)
EVM user’s guide: PDF | HTML
Supported products & hardware

Supported products & hardware

Hardware development
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
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ADS9110EVM-PDK — ADS9110 performance demonstration kit for 18-bit, 2-MSPS, one-channel SAR ADC with enhanced SPI

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Hardware development
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
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 18-Bit, 2-MSPS Isolated Analog Acquisition Reference Design for Maximum SNR (Rev. A) Apr 1, 2016

Related design resources

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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