Texas Instruments TUSS4440 Transformer Drive Ultrasonic Sensor IC
Texas Instruments TUSS4440 Transformer Drive Ultrasonic Sensor IC 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 receive signal path includes a low-noise linear amplifier and a bandpass filter, followed by a logarithmic gain amplifier for input-dependent amplification. The logarithmic amplifier allows high sensitivity for weak echo signals and offers excellent input dynamic range over the full range of reflected echoes.
The drivers can be controlled directly through the microcontroller to customize the burst signal completely or programmed through SPI with a customizable burst length. The TI 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.
Features
- Integrated driver for transformer-driven transducers and receiver stage with analog output for ultrasound applications
- 86dB input dynamic range analog front-end
- First stage low noise amplifier adjustable to 10, 12.5, 15 and 20V/V
- Configurable bandpass filter from 40KHz to 500KHz
- Wide-band logarithmic amplifier
- Supported transducer frequencies (controlled by an external clock)
- 40KHz to 400KHz
- For low-power applications
- 1.7mA (typical) standby mode
- 220µA (typical) sleep mode
- Configurable drive stage
- Complimentary low-side drivers with a 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)
Applications
- Position sensor
- Level transmitter
- Proximity sensor
Functional Block Diagram
Related Development Tool
Texas Instruments BOOSTXL-TUSS4440 Ultrasonic Transducer EVM
Enables full evaluation the TUSS4440 ultrasonic sensor signal conditioner and transformer driver.