CPC7512Z datasheet(15/18 Pages) IXYS

15 / 18 page

INTEGRATED CIRCUITS DIVISION

CPC7512

R01

www.ixysic.com

4.3 Driving Channel 1 Ultrasonic Transducer X1

To drive X1, the first transducer, switches SW1A and SW1B are closed and switch SW1C is opened. The closed

switches pass the high voltage 40-50kHz signal output by the drive circuitry through the series resistor to the

transducer.

In Channel 2, the portion of the high-voltage, high-frequency signal output by the drive circuitry that passes through

the open SW2A switch is shunted to ground through the closed SW2C switch.

Figure 8: Driving Ultrasonic Transducer X1

4.4 Ultrasonic Transducer X1 Drive Complete

Once the transducer is energized it is separated from the generator by opening Switches SW1A and SW1B. This

prevents the large stimulus source voltage from overwhelming the transducer’s much smaller output voltage created

from the energy of the reflected ultrasonic pulse. To assist in minimizing corruption of the X1 transducer’s output

signal, SW1C is closed. This enhances switch isolation. The X1 transducer’s output voltage is picked up by Receiver

Circuit 1 and sent on to the microcontroller.

Figure 9: Separating Drive Circuitry From Transducer X1

COM

SW1

SW2

To Receiver Circuit 1

To Receiver Circuit 2

COM

SW1

SW2

To Receiver Circuit 1

To Receiver Circuit 2

CPC7512Z Datasheet(PDF) 15 Page - IXYS Corporation