5-13
RF2422
Rev A6 060203
Pin
Function
Description
Interface Schematic
1I REF
Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. A voltage of 3.0V is recom-
mended. The SIG and REF inputs are inputs of a differential amplifier.
Therefore the REF and SIG inputs are interchangeable. If swapping the
I SIG and I REF pins, the Q SIG and Q REF also need to be swapped
to maintain the correct phase. It is also possible to drive the SIG and
REF inputs in a balanced mode. This will increase the gain.
2Q REF
Reference voltage for the Q mixer. This voltage should be the same as
the DC voltage supplied to the Q SIG pin. A voltage of 3.0V is recom-
mended.
3GND2
Ground connection of the LO phase shift network. This pin should be
connected directly to the ground plane.
4GND2
Same as pin 3.
5GND2
Same as pin 3.
6LO
The input of the phase shifting network. This pin has an internal DC-
blocking capacitor. At frequencies higher than 2GHz this port is well-
matched to 50
Ω. This port is voltage driven so matching at lower fre-
quencies is not required.
7VCC1
Power supply for all circuits except the RF output stage. An external
capacitor is needed if no other low frequency bypass capacitor is
nearby.
8PD
Power Down control. When this pin is "low", all circuits are shut off. A
"low" is typically 1.2V or less at room temperature.When this pin is
"high" (VCC), all circuits are operating normally. If PD is below VCC, out-
put power and performance will be degraded. Operating in this region is
not recommended, although it might be useful in some applications
where power control is required.
9RF OUT
This is the 50
Ω RF Output. This pin has an internal DC-blocking capac-
itor. At frequencies higher than 2GHz this port is well-matched. Typical
impedances at lower frequencies are: 24-j30
Ω @ 1GHz, 27-j10 Ω @
1.4GHz, 31-j3
Ω @ 1.8GHz. At those frequencies, external matching
may be needed to optimize output power.
10
GND3
Ground connection for the RF output stage. This pin should be con-
nected directly to the ground plane.
11
VCC2
Power supply for the RF Output amplifier. An external capacitor is
needed if no other low frequency bypass capacitor is near by.
12
GND1
Ground connection for the LO and baseband amplifiers, and for the
mixers. This pin should be connected directly to the ground plane.
13
GND1
Same as pin 12.
14
GND1
Same as pin 12.
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. 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 2.
425
Ω
425
Ω
100
Ω
100
Ω
Q REF
Q SIG
425
Ω
425
Ω
100
Ω
100
Ω
Q REF
Q SIG
LO
200 Ω
PD
V
CC
RF OUT
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