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4-585
RF3374
Rev A8 050524
Pin
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.
R
V
SUPPLY
V
DEVICE
–
()
I
CC
-------------------------------------------------------
=
RF IN
RF OUT
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