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5-27
RF2480
Rev A4 060329
Application Schematic
DC-Coupled
Pin
Function
Description
Interface Schematic
15
Q SIG
Baseband input to the Q mixer. This pin is DC-coupled. Maximum out-
put power is obtained when the input signal has a peak to peak ampli-
tude of 2V; for highly linear operation, the input signal (and output
power) must be reduced appropriately. The recommended DC level for
this pin is 3.0V. The peak minimum voltage on this pin (VREF - peak
modulation amplitude) should never drop below 2.0V. The peak maxi-
mum voltage on this pin (VREF + peak modulation amplitude) should
never exceed 4.0V. See pin 1 for more details.
16
I SIG
Baseband input to the I mixer. This pin is DC-coupled. Maximum output
power is obtained when the input signal has a peak to peak amplitude
of 2V; for highly linear operation, the input signal (and output power)
must be reduced appropriately. The recommended DC level for this pin
is 3.0V. The peak minimum voltage on this pin (VREF - peak modulation
amplitude) should never drop below 2.0V. The peak maximum voltage
on this pin (VREF + peak modulation amplitude) should never exceed
4.0V. See pin 1 for more details.
425
Ω
425
Ω
100
Ω
100
Ω
Q REF
Q SIG
425
Ω
425
Ω
100
Ω
100
Ω
I REF
I SIG
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Σ
POWER
CONTROL
-45°
+45°
100 nF
V
CC
100 nF
100 nF
PD
LO IN
I
REF
I SIG
Q SIG
V
CC
100 nF
RF OUT
100 nF
Q
REF
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