The EV4835A-RD-03A is an evaluation board designed for the MP4835A, a high-voltage, 32-channel analog switch. The MP4835A is designed for medical ultrasound applications. It can also be used for non-destructive tests (NDTs), as the application is very similar to medical ultrasound.  

The high-voltage analog switches are used to multiplex the transmitter and receiver circuitries to different piezoelectric transducer (PZT) elements. The MP4835A has a resistor connected from the ground to the output pins (SWOUTx, where x = 0–31). This ensures that a significant DC voltage does not build up across the PZT element. The switches can be turned on/off via a serial 32-bit shift register. The serial control interface minimizes the number of input/output (I/O) connections. 

The EV4835A-RD-03A has two discrete high-voltage transmitters (TX1 and TX2) to help evaluate the performance of the MP4835A. TX1 is configured as 1:2 and TX2 is configured as 1:3, which are the two most common configurations. 

The EV4835A-RD-03A is designed to work with MPS’s ultrasound controller board, the EV-EVK-RD-01A. A graphical user interface (GUI) is provided to easily control the analog switch states, transmitters (TX1 and TX2),  pulse widths, and pulse cycles.  

The MP4835A is available in a QFN-72 (10mmx10mm) package.