Texas Instruments TUSS4470 Direct Drive Ultrasonic Sensor IC
Texas Instruments TUSS4470 Direct Drive Ultrasonic Sensor IC is a highly integrated transformer drive analog front end for industrial ultrasonic applications. The transducer drive stage is an internal H-bridge that can be configured to drive the transducer in direct-drive mode to achieve maximum voltage across the transducer. The internal H-bridge can also be configured as a pre-driver for external FETs, enabling higher current and voltage drive for larger transducers.
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 for 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 for complete customization of the burst signal or programmed through SPI with a customizable burst length. The Texas Instruments TUSS4470 can support a single transducer to send and receive burst signals or set up two transducers to split the send-and-receive functions.
Features
- Integrated driver for directly driving 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 1MHz
- 40KHz to 440KHz pre-driver mode
- Configurable drive stage
- Direct drive using internal H-Bridge for transducer excitation
- Pre-driver configuration to use internal H-bridge to drive external Field Effect Transistors (FETs) for higher current drive
- Configurable burst patterns using IO1 and IO2 pins
- For low-power applications
- 1.7mA (typical) standby mode
- 220µA (typical) sleep mode
- 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-TUSS4470 Ultrasonic Transducer EVM
Enables full evaluation of the TUSS4470 ultrasonic sensor signal conditioner and H-bridge driver.