3 of 8
RF3377
Rev A6 DS050524
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Package Drawing
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 applica-
tions. DC coupling of the input is not allowed, because this will override the
internal feedback loop and cause temperature instability.
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 determined by
the following equation:
Care should also be taken in the resistor selection to ensure that the cur-
rent into the part never exceeds 60mA over the planned operating temper-
ature. This means that a resistor between the supply and this pin is always
required, even if a supply near 3.6V is available, to provide DC feedback to
prevent thermal runaway. 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.
4GND
Ground connection.
R
V
SUPPLY
V
DEVICE
–
()
I
CC
-------------------------------------------------------
=
RF IN
RF OUT
Shaded lead is pin 1.
Dimensions in mm.
0.43
0.38
1.60
1.40
1.75
1.40
1.80
1.45
0.53
0.41
1.04
0.80
0.50
0.30
4.60
4.40
2.60
2.40
3.10
2.90
0.48
0.36
2 PL
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