Overview
The Texas Instruments TUSS4470TRTJR is a highly integrated direct drive ultrasonic sensor IC designed for industrial ultrasonic applications. This IC features an internal H-bridge that can be configured to drive transducers in either direct-drive mode or as a pre-driver for external Field Effect Transistors (FETs) to achieve higher current and voltage drive. The receive signal path includes a low-noise linear amplifier, a configurable bandpass filter, and a wide-band logarithmic amplifier, which enhances sensitivity for weak echo signals and offers an excellent input dynamic range. The TUSS4470TRTJR supports low-power applications with standby and sleep modes, and it can be controlled and configured via a Serial Peripheral Interface (SPI) by a microcontroller.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 20-QFN |
| Operating Temperature Range | -25°C to 105°C |
| Input Dynamic Range | 86 dB |
| First Stage Low Noise Amplifier Gain | Adjustable to 10, 12.5, 15, and 20 V/V |
| Bandpass Filter Range | 40 KHz to 500 KHz |
| Supported Transducer Frequencies | 40 KHz to 1 MHz (controlled by external clock) |
| Pre-driver Mode Frequency Range | 40 KHz to 440 KHz |
| Standby Mode Current | 1.7 mA (typical) |
| Sleep Mode Current | 220 µA (typical) |
| 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 |
Key Features
- Integrated driver for directly driving transducers and receiver stage with analog output for ultrasound applications
- Configurable drive stage: Direct drive using internal H-Bridge for transducer excitation or pre-driver configuration for external FETs
- Configurable burst patterns using IO1 and IO2 pins
- Low-noise linear amplifier and wide-band logarithmic amplifier for high sensitivity and excellent input dynamic range
- Serial Peripheral Interface (SPI) for configuration by microcontroller (MCU)
- Support for single transducer or dual transducer setup for send and receive functions
- Low-power modes: Standby and sleep modes for energy efficiency
Applications
The TUSS4470TRTJR is designed for various industrial ultrasonic applications, including distance measurement, level detection, and object detection. It is particularly useful in environments where high sensitivity and a wide dynamic range are required, such as in industrial automation, medical devices, and non-destructive testing.
Q & A
- What is the primary function of the TUSS4470TRTJR? The primary function is to serve as a highly integrated direct drive ultrasonic sensor IC for industrial ultrasonic applications.
- What types of transducer drive configurations are supported by the TUSS4470TRTJR? It supports direct drive using an internal H-Bridge and pre-driver configuration to drive external FETs.
- What is the input dynamic range of the analog front-end? The input dynamic range is 86 dB.
- What are the adjustable gain values for the first stage low noise amplifier? The gain can be adjusted to 10, 12.5, 15, and 20 V/V.
- What is the frequency range of the configurable bandpass filter? The bandpass filter can be configured from 40 KHz to 500 KHz.
- What are the supported transducer frequencies? The supported frequencies range from 40 KHz to 1 MHz, controlled by an external clock.
- How can the burst signal be controlled? The burst signal can be controlled directly through a microcontroller or programmed through SPI with a customizable burst length.
- What are the typical current consumptions in standby and sleep modes? The typical current consumption is 1.7 mA in standby mode and 220 µA in sleep mode.
- What outputs are available from the TUSS4470TRTJR? The outputs include the voltage output of the demodulated echo envelope on VOUT, input signal zero crossing comparator output on OUT3 pin, and programmable VOUT threshold crossing on OUT4 pin.
- Can the TUSS4470TRTJR support multiple transducer setups? Yes, it can support a single transducer or a setup with two transducers to split the send and receive functions.
