High-Resolution, High-SNR True Raw Data Conversion Reference Design for Ultrasound CW Doppler


Design files


This reference design is a continuous wave (CW) signal conditioning for ultrasound imaging systems (64-, 128-, 192-, 256-channel ultrasound system). This design features 20-bit fully differential simultaneous sampling with true raw data available for processing. It consists of a fully-differential signal path for I and Q channels, each using high-performance SAR analog-to-digital converter (ADCs) (ADS8900B), fully-differential precision amplifier (THS4551), a dual low-noise, low dropout (LDO) voltage regulator (TPS7A8801) and a precision voltage reference (REF5050). TIDA-01351 can be interfaced with the PH1-EVM controller through the multiSPI™ digital interface, and the performance can be evaluated using a PC-based graphical user interface (GUI) from any PC through the USB interface.

  • Two simultaneous channels (I and Q) fully-differential signal chain providing zero-latency true raw data with SNR of 101.2 dB and ENOB of 16.45
  • Eight-channel summing, filtering, buffering and gain implemented in single-stage high-bandwidth, low-power, low-noise, single supply
  • High sampliing rate of 1 MSPS allows flexibility in post-processing to improve SNR and resolution
  • Bandpass filtering for frequency range of 50 Hz to 20 kHz
  • Operates from single 6-V power supply with total power consumption of 258 mW
  • Designed using 20-bit, 1-MSPS SAR ADC (ADS8900B) with INL of 1 ppm and SNR of 104.5 dB
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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRPO1.ZIP (2265 K)

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

TIDCD47.ZIP (2381 K)

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

TIDRPO0.PDF (4318 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Fully differential amplifiers

THS4551Low Noise, Precision, 150MHz, Fully Differential Amplifier

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

TPS7A881-A, low-noise, high-PSRR, dual-channel adjustable ultra-low-dropout voltage regulator

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

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Support software


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Supported products & hardware

Supported products & hardware

Precision ADCs
ADS8900B 20-bit, 1-MSPS, one-channel SAR ADC with internal VREF buffer, internal LDO and enhanced SPI


Latest version
Release date: 27 Mar 2017
lock = Requires export approval (1 minute)
Precision ADCs
ADS8900B 20-bit, 1-MSPS, one-channel SAR ADC with internal VREF buffer, internal LDO and enhanced SPI

Technical documentation

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Type Title Date
* Design guide High-Res, High-SNR True Raw Data Conversion Ref Design for Ultrasound CW Doppler (Rev. B) Oct. 18, 2017
Technical article Take your ultrasound design to the next level Feb. 08, 2018
Application note Precision Sum Circuit Support Hi Output Current Multiple AFEs in Ultasound App Nov. 20, 2017
Application note Improving Resolution of SAR ADC Jun. 14, 2017
Technical article How to enable high-accuracy CW Doppler through discrete, precision data converters Mar. 24, 2017
Application note DC Controlled Low Pass Filter Mar. 09, 2017
White paper Enabling Faster, Smarter, and More Robust Solutions for SAR ADSx With multiSPI Nov. 08, 2016

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