rf2422 RF Micro Devices, rf2422 Datasheet - Page 4

• Manufacturer Part Number: rf2422
• Description: 2.5 Ghz Direct Quadrature Modulator Rf2422
• Manufacturer: RF Micro Devices

RF2422
4 of 10
Pin
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
Function
RF OUT
Q REF
GND2
GND2
GND2
GND3
GND1
GND1
GND1
Q SIG
VCC1
VCC2
I REF
PD
LO
Description
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.
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.
Ground connection of the LO phase shift network. This pin should be con-
nected directly to the ground plane.
Same as pin 3.
Same as pin 3.
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
50Ω. This port is voltage driven so matching at lower frequencies is not
required.
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.
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
all circuits are operating normally. If PD is below V
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.
This is the 50Ω 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 Ω @ 1GHz, 27-j10 Ω @ 1.4GHz, 31-
j3 Ω @ 1.8GHz. At those frequencies, external matching may be needed to
optimize output power.
Ground connection for the RF output stage. This pin should be connected
directly to the ground plane.
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.
Baseband input to the Q mixer. This pin is DC-coupled. Maximum output
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 (V
below 2.0V. The peak maximum voltage on this pin (V
tion amplitude) should never exceed 4.0V.
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REF
- peak modulation amplitude) should never drop
CC
, output power and
REF
+ peak modula-
CC
),
Interface Schematic
See pin 2.
Q SIG
PD
Q SIG
100 Ω
100 Ω
LO
425 Ω
425 Ω
200 Ω
Rev A6 DS070817
425 Ω
425 Ω
RF OUT
100 Ω
100 Ω
V
Q REF
CC
Q REF