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


Design files


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

  • 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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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.

TIDUB85A.PDF (4088 K)

Reference design overview and verified performance test data

TIDRL57A.PDF (3438 K)

Detailed schematic diagram for design layout and components

TIDRL58.PDF (80 K)

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

TIDRL59.PDF (467 K)

Detailed overview of design layout for component placement

TIDRL61A.ZIP (25672 K)

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

TIDCC14.ZIP (681 K)

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

TIDRL60.PDF (3526 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Precision ADCs

ADS911018-bit, 2-MSPS, one-channel SAR ADC with enhanced serial peripheral interface (SPI)

Data sheet: PDF | HTML
AND gates

SN74LVC1G081-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength 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

TLV3012Low-power comparator with reference (push-pull)

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
High-speed op amps (GBW ≥ 50 MHz)

OPA625High Bandwidth, High Precision, Low Noise & Distortion Amplifier SAR ADC Driver with Power Scaling

Data sheet: PDF | HTML
I2C isolators

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

Data sheet: PDF | HTML

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
Noninverting buffers & drivers

SN74LVC1G17Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs

Data sheet: PDF | HTML

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

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
Precision op amps (Vos<1mV)

OPA378Low-noise, 900-kHz, RRIO, precision operational amplifier, zero-drift series

Data sheet: PDF
Series voltage references

REF50454.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML
Transformer drivers

SN6505ALow-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

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

Reference designs

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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