RF2628
Pin
1
Function Description
Interface Schematic
Balanced IF input pin. This pin is internally DC-biased and should be
IF+
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, as well as single-ended,
input impedance is 265Ω. The IF input should be used differentially
when the part is used as a BPSK modulator.
IF+
IF-
BIAS
Same as pin 1, except complementary input.
See pin 1.
2
3
IF-
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
Bypass connection for the LO. A capacitor of 100pF to ground should
be connected to this pin
4
LO BYPASS
LO
BYPASS
LO
BIAS
Balanced LO input pin. This pin is internally DC-biased and should be See pin 4.
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. The balanced, as well single-ended,
input impedance is 50Ω.
5
LO
6
Same as pin 3.
6
7
GND
VCC
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.
RF output pin. This pin is internally DC-blocked. The output impedance
is 50Ω.
8
RF OUT
RF OUT
Rev B4 010720
6-21
RFMD [ RF MICRO DEVICES ]
