TIDA-01351
High-Resolution, High-SNR True Raw Data Conversion Reference Design for Ultrasound CW Doppler
TIDA-01351
Overview
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.
Features
- 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
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUCD9B.PDF (8399 K)
Reference design overview and verified performance test data
TIDRPN7A.PDF (903 K)
Detailed schematic diagram for design layout and components
TIDRPN8.PDF (145 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRPN9.PDF (942 K)
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
Products
Includes TI products in the design and potential alternatives.
Fully differential amplifiers
THS4551 — Low Noise, Precision, 150MHz, Fully Differential Amplifier
Data sheetLinear & low-dropout (LDO) regulators
TPS7A88 — 1-A, low-noise, high-PSRR, dual-channel adjustable ultra-low-dropout voltage regulator
Data sheetPrecision ADCs (<=10MSPS)
ADS8900B — 20-Bit, 1-MSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface
Data sheetPrecision op amps (Vos<1mV)
OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp
Data sheetSeries voltage references
REF5050 — 5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference
Data sheetStart development
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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