Transformer drive ultrasonic sensor IC with logarithmic amplifier

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.