Ultrasonic transducer EVM evaluates sensor signal conditioner and H-bridge driver

08-06-2020 | Texas Instruments | Design & Manufacture

Texas Instruments BOOSTXL-TUSS4470 Ultrasonic Transducer EVM allows users to completely evaluate the TUSS4470 ultrasonic sensor signal conditioner and H-bridge driver.

Transducer compatibility is extended to open or closed-top transducers operating between 30kHz to 1000kHz. The transducer drive stage is an internal H-bridge that is able to be configured to drive transducer in direct-drive mode to deliver maximum voltage over the transducer or can be configured as a pre-driver for external FETs, facilitating higher current and voltage drive for larger transducers. The drivers can be either controlled directly via MCU for complete customisation of the burst signal or can be programmed via SPI with customisable burst length. The receive signal path incorporates a low-noise linear amplifier, a bandpass filter followed by a logarithmic gain amplifier for input dependent amplification. This provides for high sensitivity for weak signals and gives excellent input dynamic range across a full signal range. The associated TUSS Generation III EVM GUI can be employed to customise, configure, and control the ultrasonic setup, and monitor the performance of the resulting ultrasonic activity.

The EVM includes one H-bridge driven closed-top transducer.

By Natasha Shek