RF2638
Pin
1
Function Description
Interface Schematic
Balanced IF input pin. This pin is internally DC-biased and should be
IF-
BIAS
DC-blocked if connected to a device with a DC level present. For single-
ended input operation, one pin is used as an input and the other IF
input is AC-coupled to ground. The balanced, input impedance is
260Ω.
130 Ω
130 Ω
IF-
IF+
Same as pin 1, except complementary input.
See pin 1.
2
3
IF+
BYP
Bypass pin for internal bias circuitry. Bypass with a 1nF capacitor.
BYP
Balanced LO input pin. This pin is internally DC-biased and should be
DC-blocked if connected to a device with a DC level present. For single-
ended input operation, one pin is used as an input and the other LO
input is AC-coupled to ground.
4
LO-
BIAS
LO-
LO+
Same as pin 4, except complementary input.
See pin 4.
5
6
LO+
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
Supply voltage pin. External bypassing is required. External RF, LO,
and IF 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.
7
VCC
RF output pin.
8
RF OUT
300 Ω
RF OUT
Rev B15 060921
6-29
RFMD [ RF MICRO DEVICES ]
