4 of 8
RF2480
Rev A4 DS060329
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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 recommended.
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.
For optimum carrier suppression, the DC voltages on I REF, Q REF, I SIG
and Q SIG should be adjusted slightly to compensate for inherent undes-
ired internal DC offsets; for optimum sideband suppression, phase and sig-
nal amplitude on IREF, Q REF, I SIG and Q SIG should be adjusted slightly to
compensate for inherent undesired internal offsets. See RFMD AN0001 for
more detail.
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 recommended.
See pin 1 for more details.
3GND2
Ground connection of the LO phase shift network. This pin should be con-
nected 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 block-
ing capacitor. This port is voltage driven so matching at different frequen-
cies is not required.
7VCC1
Power supply for all circuits except the RF output stage. An external capaci-
tor 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" (V
CC),
all circuits are operating normally. If PD is below V
CC, output power and
performance will be degraded. Operating in this region is not recom-
mended, although it might be useful in some applications where power
control is required.
9RF OUT
RF Output. This pin has an internal DC blocking capacitor. At some frequen-
cies, external matching may be needed to optimize output power.
10
GND3
Ground connection for the RF output stage. This pin should be connected
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.
425
Ω
425
Ω
100
Ω
100
Ω
I REF
I SIG
425
Ω
425
Ω
100
Ω
100
Ω
Q REF
Q SIG
LO
20 0
Ω
PD
V CC
RF OUT
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