RF2423PCBA Ver la hoja de datos (PDF) - RF Micro Devices
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RF2423PCBA Datasheet PDF : 8 Pages
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RF2423
Pin Function Description
Interface Schematic
1
GC
Gain control of the RF amplifier. This pin can be used to control the out-
5 kΩ
put power over a 25dB range. Output power is the lowest when the
GC
control voltage is 1V or lower, and the highest when set to 4V or higher.
When a fixed maximum output level is needed, it is recommended to
connect this pin to VDD.
10 kΩ
2
PHASE This pin adjusts the phase of the I/Q signals. However, the control is
very sensitive and hard to control. Control voltage change for a few
PHASE
3
4
5
VDD1
GND2
LO IN
degrees adjustment is in the order of 10mV. Device to device and tem-
perature variation are not characterized. Therefore it is not recom-
mended to use this pin; leave it not connected. Do NOT connect it to
S ground. For compensating large errors in the I/Q signals supplied to the
device or in control loops, this pin may prove useful.
N Power supply to all circuits except the RF output stages. It is recom-
mended to put some RF decoupling on this pin, though it is not critical.
An optional 0.1µF capacitor is required if no other low frequency
G bypass capacitor is nearby.
I Ground connection for the gain controlled RF amplifier. Keep traces
physically short and connect immediately to ground plane for best per-
S formance.
Modulator LO input. A series 22nH inductor can be used for matching.
LO IN
E This pin is NOT internally DC blocked. An external blocking capacitor
must be provided if the pin is connected to a device with DC present. A
D DC path to ground (i.e. an inductor or resistor to ground) is, however,
4 kΩ
5
acceptable at this pin. If a blocking capacitor is required, a value of
6
7
GND1
I REF
33pF is recommended.
Ground connection for the baseband, LO and mixer circuits. Keep
W traces physically short and connect immediately to ground plane for
best performance.
E Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. To obtain a carrier suppres-
N sion of better than 25dB it may be tuned ±0.15V (relative to the I SIG
I REF
I SIG
8
I SIG
NOT 9
Q SIG
DC voltage). Without tuning, it will typically be better than 25dB. Input
impedance of this pin is about 3kΩ.
OR Baseband input to the I mixer. This pin is DC coupled. Maximum output
Fpower is obtained when the input signal has a peak to peak amplitude
of 5V. The DC level supplied to this pin should be VDD2/2. Input imped-
ance of this pin is about 3kΩ.
Baseband input to the Q mixer. This pin is DC coupled. Maximum out-
put power is obtained when the input signal has a peak to peak ampli-
tude of 5V. The DC level supplied to this pin should be VDD2/2. Input
impedance of this pin is about 3kΩ.
2 kΩ
1 kΩ
Q REF
2 kΩ
2 kΩ
1 kΩ
Q SIG
2 kΩ
1 kΩ
1 kΩ
10
Q REF
Reference voltage for the Q mixer. This voltage should be the same as
the DC voltage supplied to the Q SIG pin. To obtain a carrier suppres-
sion of better than 25dB it may be tuned ±0.15V (relative to the Q SIG
DC voltage). Without tuning it will typically be better than 25dB. Input
impedance of this pin is about 3kΩ.
Rev A3 001218
5-37
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