RF2480 データシートの表示（PDF） - RF Micro Devices
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RF2480 Datasheet PDF : 8 Pages
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RF2480
Pin Function Description
Interface Schematic
1
I 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
I SIG
I REF
REF and SIG inputs are interchangeable. If swapping the I SIG and I REF
100
100
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.
425
425
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 unde-
sired internal DC offsets; for optimum sideband suppression, phase and
signal 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.
2
Q 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.
Q SIG
See pin 1 for more details.
100
Q REF
100
425
425
3
GND2
Ground connection of the LO phase shift network. This pin should be con-
nected directly to the ground plane.
4
GND2
Same as pin 3.
5
GND2
Same as pin 3.
6
LO
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-
LO
cies is not required.
7
VCC1
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.
8
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 "high" (VCC),
VCC
all circuits are operating normally. If PD is below VCC, output power and
performance will be degraded. Operating in this region is not recom-
2 0 0
PD
mended, although it might be useful in some applications where power
control is required.
9
RF 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.
RF OUT
4 of 8
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
DS121024
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