RF2423 データシートの表示（PDF） - RF Micro Devices
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RF2423 Datasheet PDF : 8 Pages
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RF2423
Pin Function Description
Interface Schematic
11
GND4
Ground connection for the RF driver and output stage. Keep traces
physically short and connect immediately to ground plane for best per-
formance. Having a good ground connection on this pin is extremely
important due to the high RF levels in the circuits connected to this pin.
12
RF OUT 50Ω RF output. This pin is not internally DC blocked and an external
blocking capacitor of 22pF is needed.
VDD
RF OUT
5
13
14
15
GND3
VDD3
VDD2
Ground connection for the RF driver and output stage. Keep traces
physically short and connect immediately to ground plane for best per-
formance. Having a good ground connection on this pin is extremely
important due to the high RF levels in the circuits connected to this pin.
S Power supply for the RF output stage. A 33pF external bypass capaci-
tor is required and an optional 0.1µF will be required if no other low fre-
N quency bypass capacitors are nearby. The trace length between the pin
and the bypass capacitors should be minimized. The ground side of the
bypass capacitors should connect immediately to ground plane.
G Having good bypassing on this pin is especially important because of
I the high levels of RF signal on the circuits connected to this pin.
Power supply for the RF driver stage. A 33pF external bypass capacitor
S is required and an optional 0.1µF will be required if no other low fre-
quency bypass capacitors are near by. The trace length between the
E pin and the bypass capacitors should be minimized. The ground side of
the bypass capacitors should connect immediately to ground plane.
D Having good bypassing on this pin is especially important because of
the high levels of RF signal on the circuits connected to this pin.
16
STANDBY
Standby mode control. When this pin is 0V all circuits are turned off,
and when this pin is VDD all circuits are operating. This is a high
impedance input, internally connected to the gate of a few transistors.
W To minimize current consumption in power down mode, this pin should
be as close to 0 V as possible, or even a little negative. Turn-on voltage
E of some parts of the circuit may be as low as 0.0 V. In order to maxi-
mize output power this pin should be as close to VDD as possible dur-
N ing normal operation.
FOR
NOT
5-38
Rev A3 001218
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