RF2608
Pin
1
Function
IF+
Description
Balanced IF 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 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.
Same as pin 1, except complementary input.
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
Interface Schematic
IF+
IF-
BIAS
2
3
4
IF-
GND
LO BYPASS
See pin 1.
LO
LO
BYPASS
BIAS
5
LO
6
7
GND
VCC
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.
Same as pin 3.
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.
6
MIXERS
RF OUT
8
RF OUT
Application Schematic
1 nF
IF+
1 nF
IF-
2
3
100 pF
4
5
100 pF
LO
7
100 pF
6
100 nF
1
8
V
CC
RF OUT
Rev B3 010720
6-17
RFMD [ RF MICRO DEVICES ]
