RF2878
Pin
1
Function
RF IN
Description
RF input pin. This pin is DC coupled and matched to 50Ω at 836 MHz.
Interface Schematic
To Bias
Circuit
RF OUT
RF IN
2
3
GND1
VPD
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
For low noise amplifier applications, this pin is used to control the bias cur-
rent. See plots for bias current settings. An external resistor (R1) can be
used to set the bias current for any V
PD
voltage.
For driver amplifier applications, this is the Power Down pin for the IC.
V
PD
=2.8V +/- 0.1V is required for proper operation. V
PD
< 0.9V turns off
the Part. External RF bypassing is required. The trace length between the
pin and the bypass capacitors should be minimized. The ground side of the
bypass capacitors should connect immediately to ground plane. Nominal
current required for V
PD
=2.8V is 2.0mA typical and 3.0mA Max (@
V
PD
=2.9V).
PD
4
RF OUT
5
GND2
Amplifier Output pin. This pin is an open-collector output. It must be biased
to either V
CC
or pin 4 through a choke or matching inductor. This pin is typi-
cally matched to 50Ω with a shunt bias/matching inductor and series
blocking/matching capacitor. Refer to application schematics.
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
Package Drawing
1.60
+ 0.01
0.400
1
0.15
0.05
2.90
+ 0.10
0.950
2.80
+ 0.20
3° MAX
0° MIN
0.45
+ 0.10
0.127
1.44
1.04
Dimensions in mm.
Rev A0 DS060206
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
5 of 14
RFMD [ RF MICRO DEVICES ]
