CPC7512

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R01

4. Design Example

The CPC7512 can be used to provide a multiplexer function in ultrasonic transducer applications allowing the

expense and the PCB real estate consumption of a transducer drive circuitry to be spread across multiple

transducers. The steps to implement this concept are shown in the minimal two channel example below.

connected to ground.

4.1 Startup State Following Power Up

To facilitate a stable and safe power up transition or recovery from a supply voltage droop, all of the switches in the

CPC7512 are preconditioned to the All-Off state upon power up. As can be seen in the figure below, all of the

switches are open.

Figure 6: Power Up Default State

4.2 Initial Configuration State

Following power up, the switches should be placed in the high impedance shunt isolation state. To provide maximum

state minimizes signal transfer through the open A and B switches.

Figure 7: Switches A and B Open With Shunt Isolation Enabled

S1

B

S1

C

S1

COM

S1

A

S2

B

S2

C

S2

COM

S2

A

SW1

A

SW1

B

SW1

C

SW2

A

SW2

B

SW2

C

X

1

X

2

To Receiver Circuit 1

To Receiver Circuit 2

S1

B

S1

C

S1

COM

S1

A

S2

B

S2

C

S2

COM

S2

A

SW1

A

SW1

B

SW1

C

SW2

A

SW2

B

SW2

C

X

1

X

2

To Receiver Circuit 1

To Receiver Circuit 2