RF2422PCBA-41X 查看數據表（PDF） - RF Micro Devices
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RF2422PCBA-41X Datasheet PDF : 9 Pages
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RF2422
Pin Function Description
Interface Schematic
1
I REF
Reference voltage for the I mixer. This voltage should be the same as the
I SIG
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
100
I REF
100
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.
425
425
2
Q REF
Reference voltage for the Q mixer. This voltage should be the same as the
Q SIG
DC voltage supplied to the Q SIG pin. A voltage of 3.0V is recommended.
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. At frequencies higher than 2GHz this port is well-matched to
50. This port is voltage driven so matching at lower frequencies is not
LO
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"
VCC
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, output power and
PD
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.
9
RF OUT
This is the 50 RF Output. This pin has an internal DC-blocking capacitor.
At frequencies higher than 2GHz this port is well-matched. Typical imped-
ances at lower frequencies are: 24-j30 @ 1GHz, 27-j10 @ 1.4GHz, 31-
j3 @ 1.8GHz. At those frequencies, external matching may be needed to
optimize output power.
RF OUT
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.
15
Q SIG
Baseband input to the Q mixer. This pin is DC-coupled. Maximum output See pin 2.
power is obtained when the input signal has a peak to peak amplitude 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 modula-
tion amplitude) should never exceed 4.0V.
4 of 9
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DS121024
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