2.3 nV/√Hz, Differential, Time Gain Control (TGC) DAC Reference Design for Ultrasound

(ACTIVE) TIDA-01427

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Key Document

Description

The TIDA-01427 reference design provides a solution for differential signal chain used for generating a time-varying control voltage (VCNTL) to drive multiple AFE devices in a parallel configuration. TI's low-noise analog front ends (AFEs) for medical ultrasound have a time gain control (TGC) feature that helps achieve best possible signal-to-noise ratio (SNR) for ultrasound applications. This reference design uses dual multiplying DACs (DAC8802) followed by current-to-voltage converters (OPA2209) to generate a 20-V swing. After filtering this 20-V swing with a multiple feedback filter (THS4130), it is attenuated to 1.5-V using a passive attenuator. The design can be powered using a ±15 or 5-V supply (onboard Fly-Buck converter LM5160 converts a 5-V input to ±15-V rails). The clean power suppplies for the entire signal chain are generated using the TPS7A39 and TPS7A47. The ±10-V references for the DAC are generated using the REF5010 and OPA2209.

Features
  • Low-noise (2.3nV/√Hz), differential TGC signal enables AFE58xx series devices to amplify lower amplitude signals resulting in higher depth of penetration in ultrasound imaging
  • Enables AFEs to resolve the data with lower noise resulting in high resolution ultrasound images
  • Full signal chain propagation delay of < 5µs improves overall system response time
  • Second-order Butterworth active low-pass filter with fc = 150 kHz helps smooth transition of control signal
  • Capable of driving up to 64+ channels of AFEs
  • Configurable output common-mode voltage from 0 to 2.5V to support AFEs with different control voltage requirements

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Design Files

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Bill of Materials (BOM)

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DAC8802  14-Bit, Dual Channel, Serial Interface, Multiplying Digital-to-Analog Converter  Digital-to-analog converters (DACs)  Sample & Buy Not Available
LM5160  LM5160 Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
OPA2209  2.2nV/rtHz, 18MHz, Precision, RRO, 36V Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5010  Low Noise, Very Low Drift, Precision Series Voltage Reference  Voltage references  Sample & Buy Not Available
THS4130  Fully Differential Input/Output Low Noise Amplifier With Shutdown  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A39  Dual, 150mA, Wide-Vin, Positive and Negative Low-Dropout (LDO) Voltage Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36V, 1A, 4.17μVRMS, RF Low-Dropout (LDO) Voltage Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
DAC8802 Download Download
LM5160 Download Download
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OPA2209 Download Download
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REF5010 Download Download
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THS4130 Download Download
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TPS7A39 Download Download
TPS7A47 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

Application notes (2)
Title Abstract Type Size (KB) Date Views
PDF 488 26 Apr 2017 74
PDF 319 02 Dec 2016 58
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 7231 08 Aug 2017 19
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1250 08 Aug 2017 4
ZIP 1373 08 Aug 2017 6
PDF 1059 08 Aug 2017 7
PDF 248 08 Aug 2017 5
PDF 103 08 Aug 2017 8
PDF 435 08 Aug 2017 63
Related Tools & Software

Software (1)


Models (1)

Title Category Type Size (KB) Date Views
TIDA-01427 TINA Simulation TINA-TI Reference Design ZIP 24 KB 10 Aug 2017 3 views

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