RF2608 データシートの表示（PDF） - RF Micro Devices
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RF2608 Datasheet PDF : 4 Pages
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RF2608
Pin
1
2
3
4
Function
IF+
Description
Interface Schematic
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-
IF+
IF-
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.
BIAS
IF-
GND
LO BYPASS
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
See pin 1.
LO
LO
BYPASS
BIAS
5
LO
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,
6
input impedance is 50Ω.
6
GND
Same as pin 3.
7
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.
8
RF OUT RF output pin. This pin is internally DC-blocked. The output impedance
is 50Ω.
RF OUT
1 nF
IF+
1 nF
IF-
100 pF
Application Schematic
1
8
2
7
100 pF
3
6
RF OUT
VCC
100 nF
4
5
LO
100 pF
Rev B3 010720
6-17
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