RF2422
Pin
1
Function Description
Interface Schematic
Reference voltage for the I mixer. This voltage should be the same as
I REF
Q REF
GND2
Q SIG
Q REF
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.
100Ω
100Ω
425Ω
425Ω
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.
2
3
Q SIG
Q REF
100Ω
100Ω
425Ω
425Ω
5
Ground connection of the LO phase shift network. This pin should be
connected directly to the ground plane.
Same as pin 3.
Same as pin 3.
4
5
6
GND2
GND2
LO
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 50Ω. This port is voltage driven so matching at lower fre-
quencies is not required.
LO
Power supply for all circuits except the RF output stage. An external
capacitor is needed if no other low frequency bypass capacitor is
nearby.
7
8
VCC1
PD
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
VCC
200 Ω
"high" (V ), all circuits are operating normally. If PD is below V , out-
CC
CC
PD
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.
This is the 50Ω 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.
9
RF OUT
RF OUT
Ground connection for the RF output stage. This pin should be con-
nected directly to the ground plane.
10
11
12
GND3
VCC2
GND1
Power supply for the RF Output amplifier. An external capacitor is
needed if no other low frequency bypass capacitor is near by.
Ground connection for the LO and baseband amplifiers, and for the
mixers. This pin should be connected directly to the ground plane.
Same as pin 12.
Same as pin 12.
13
14
15
GND1
GND1
Q SIG
Baseband input to the Q mixer. This pin is DC-coupled. Maximum out- See pin 2.
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 (V
- peak modulation amplitude)
REF
should never drop below 2.0V. The peak maximum voltage on this pin
(V + peak modulation amplitude) should never exceed 4.0V.
REF
Rev A5 010817
5-31
RFMD [ RF MICRO DEVICES ]
