RF3374 datasheet(3/8 Pages) RFMD

3 / 8 page

4-585

RF3374

Rev A7 050310

Function

Description

Interface Schematic

1RF IN

RF input pin. This pin is NOT internally DC blocked. A DC blocking

capacitor, suitable for the frequency of operation, should be used in

most applications. DC coupling of the input is not allowed, because this

will override the internal feedback loop and cause temperature instabil-

ity.

2GND

Ground connection.

3RF OUT

RF output and bias pin. Biasing is accomplished with an external series

resistor and choke inductor to VCC. The resistor is selected to set the

DC current into this pin to a desired level. The resistor value is deter-

mined by the following equation:

Because DC is present on this pin, a DC blocking capacitor, suitable for

the frequency of operation, should be used in most applications. The

supply side of the bias network should also be well bypassed. Care

should also be taken in the resistor selection to ensure that the cur-

rent into the part never exceeds 80mA over the planned operating

temperature.

4GND

Ground connection.

VSUPPLY VDEVICE

–

()

ICC

-------------------------------------------------------

RF IN

RF OUT

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