Transformer drive ultrasonic sensor IC with logarithmic amplifier


Product details


Type Analog front-end (AFE) Features Transformer drive Frequency (kHz) 40-400 kHz Gain (Min) (dB) 19 Gain (Max) (dB) 113 Number of input channels 1 Supply voltage (Max) 36 Operating temperature range (C) -25 to 105 Supply voltage (Min) 5 Interface type SPI Rating Catalog open-in-new Find other Ultrasonic sensor AFEs

Package | Pins | Size

WQFN (RTJ) 20 16 mm² 4 x 4 open-in-new Find other Ultrasonic sensor AFEs


  • Integrated driver for transformer driven transducers and receiver stage with analog output for ultrasound applications
  • 86-dB input dynamic range analog front-end
    • First stage low noise amplifier adjustable to 10, 12.5, 15 and 20 V/V
    • Configurable bandpass filter from 40 KHz to 500 KHz
    • Wide-band logarithmic amplifier
  • Supported transducer frequencies (controlled by external clock)
    • 40 KHz to 400 KHz
  • For low-power applications
    • Standby mode: 1.7 mA (typical)
    • Sleep mode: 220 µA (typical)
  • Configurable drive stage:
    • Complimentary low-side drivers with current limit for transformer based transducer excitation
    • Configurable burst patterns using IO1 and IO2 pins
  • Outputs:
    • Voltage output of the demodulated echo envelope on VOUT
    • Input signal zero crossing comparator output on OUT3 pin
    • Programmable VOUT threshold crossing on OUT4 pin
  • Serial Peripheral Interface (SPI) for configuration by microcontroller (MCU)

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The TUSS4440 is a highly integrated transformer drive analog front end for industrial ultrasonic applications. The transducer drive stage consists of low-side complementary drivers that can be configured to drive an ultrasonic transducer through a step-up transformer. The device delivers constant current to the primary side of the transformer.

The receive signal path includes a low-noise linear amplifier, a bandpass filter, followed by a logarithmic gain amplifier for input dependent amplification. The logarithmic amplifier allows for high sensitivity for weak echo signals and offers excellent input dynamic range over full range of reflected echoes.

The drivers can be controlled directly through the microcontroller for complete customization of the burst signal, or can be programmed through SPI with a customizable burst length. The TUSS4440 can support a single transducer to send and receive burst signals, or can set up two transducers to split the send and receive functions.

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Technical documentation

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Type Title Date
* Data sheet TUSS4440 Transformer Drive Ultrasonic Sensor IC With Logarithmic Amplifier datasheet Dec. 17, 2017
Technical article Shrink your solution size with transformer-less ultrasonic ICs Jun. 15, 2020
User guide TUSS44x0 EVM for Ultrasonic Sensors User's Guide (Rev. A) Apr. 02, 2020
Application note Ultrasonic Sensing Basics (Rev. C) Mar. 26, 2020
E-book Ein Techniker-Leitfaden für Industrieroboter-Designs Mar. 25, 2020
Application note TUSS44x0 Software Development Guide Mar. 17, 2020
Application note Logarithmic Amplifier for Ultrasonic Sensor Signal Conditioning Mar. 13, 2020
E-book E-book: An engineer’s guide to industrial robot designs Feb. 12, 2020
Technical article How ultrasonic technology improves convenience and performance in home automation Oct. 05, 2017
Technical article Power naps: saving energy using ultrasonic sensing Aug. 16, 2016

Design & development

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Hardware development

document-generic User guide
The TUSS4440 EVM is a collective of the BOOSTXL-TUSS4440 and MSP-EXP430F5529LP, which enables users to fully evaluate the TUSS4440 ultrasonic sensor signal conditioner and transformer driver. Transducer compatibility is expanded to open- or closed-top transducers operating between 30 to 500 kHz. The (...)
  • Compatible with ultrasonic transducers operating at frequencies between 30 to 500 kHz.
  • Able to generate maximum sound pressure level using a transformer driver.
  • Compatible with microcontrollers operating at 3.3 or 5 V for SPI communication.
  • Modular receive path filter value selector to support entire (...)

Software development

SLDC023.ZIP (57 KB)

Design tools & simulation

SLAC787.ZIP (21 KB)
SLDC024.ZIP (4505 KB)

CAD/CAE symbols

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QFN (RTJ) 20 View options

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