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High-Resolution, High-SNR True Raw Data Conversion Reference Design for Ultrasound CW Doppler
TIDA-01351
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Key Document

High-Res, High-SNR True Raw Data Conversion Ref Design for Ultrasound CW Doppler (Rev. B) (PDF 8399 KB)
18 Oct 2017

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Description

The TIDA-01351 is a continuous wave (CW) signal conditioning subsystem 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. This TI Design consists of a fullydifferential signal path for I and Q channels, each using high-performance SAR analog-to-digital converters (ADCs) (ADS8900B), fully-differential precision amplifiers (THS4551), a dual low-noise, lowdropout (LDO) voltage regulator (TPS7A8801), and a precision voltage reference (REF5050). The 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 application (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 101.2dB and ENOB of 16.45
8-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 1ppm and SNR of 104.5dB

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Design Files

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TI Devices (5)

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Part Number	Name	Product Family	Sample & Buy	Design Kits & Evaluation Modules
ADS8900B	20-Bit, 1-MSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface	Analog-to-digital converters (ADCs)	Sample & Buy	View Design Kits & Evaluation Modules
OPA376	Precision, Low Noise, Low Iq Operational Amplifier	Operational amplifiers (op amps)	Sample & Buy	View Design Kits & Evaluation Modules
REF5050	3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference	Voltage references	Sample & Buy	View Design Kits & Evaluation Modules
THS4551	Low Noise, Precision, 150MHz, Fully Differential Amplifier	Special function amplifiers	Sample & Buy	View Design Kits & Evaluation Modules
TPS7A88	Dual 1A Low-Noise (3.8μVRMS) LDO Voltage Regulator	Power management	Sample & Buy	View Design Kits & Evaluation Modules

CAD/CAE symbols

Part #	Package \| Pins	CAD File (.bxl)	STEP Model (.stp)
ADS8900B	VQFN (RGE) \| 24		Download
OPA376	SOT-23 (DBV) \| 5	Download	Download
	SOT-SC70 (DCK) \| 5	Download	Download
	SOIC (D) \| 8	Download	Download
REF5050	SOIC (D) \| 8	Download	Download
	VSSOP (DGK) \| 8	Download	Download
THS4551	VSSOP (DGK) \| 8		Download
	WQFN (RUN) \| 10	Download	-
	VQFN (RGT) \| 16	Download	Download
TPS7A88	WQFN (RTJ) \| 20	Download	Download

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Technical Documents

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Datasheet (1)

Title	Type	Size (KB)	Date
ADS890xB 20-Bit, High-Speed SAR ADCs With Integrated Reference Buffer, and Enhanced Performance Features datasheet (Rev. A)	PDF	3373	29 Jun 2017

Application notes (3)

Title	Type	Size (KB)	Date
Precision Sum Circuit Support Hi Output Current Multiple AFEs in Ultasound App	PDF	422	20 Nov 2017
Improving Resolution of SAR ADC	PDF	78	14 Jun 2017
DC Controlled Low Pass Filter	PDF	410	09 Mar 2017

User guides (1)

Title	Type	Size (KB)	Date
High-Res, High-SNR True Raw Data Conversion Ref Design for Ultrasound CW Doppler (Rev. B)	PDF	8399	18 Oct 2017

White papers (1)

Title	Type	Size (KB)	Date
Enabling Faster, Smarter, and More Robust Solutions for SAR ADSx With multiSPI	PDF	149	08 Nov 2016

Design files (6)

Title	Type	Size (KB)	Date
TIDA-01351 Schematic and Block Diagram (Rev. A)	PDF	903	31 Jul 2018
TIDA-01351 Gerber	ZIP	2381	31 Jan 2017
TIDA-01351 CAD Files	ZIP	2265	31 Jan 2017
TIDA-01351 PCB	PDF	4318	31 Jan 2017
TIDA-01351 Assembly Drawing	PDF	942	31 Jan 2017
TIDA-01351 BOM	PDF	145	31 Jan 2017

Related Tools & Software

Software (1)

ADS8900B IQ CAP EVM
(ZIP, 260184 KB) 28 Mar 2017

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