GS1578A Data Sheet

33657 - 4

March 2006

10 of 15

The output protection diodes act as a varactor (voltage controlled capacitor) as

shown in Figure 4-3. Therefore, when measuring return loss at the GS1578A

output, it is necessary to take the measurement for both a logic high and a logic low

output condition.

Consequently, the output capacitance of the device is dependent on the logic state

of the output.

Figure 4-3: Static Protection Diodes

SDO

SDO

GS1578A