RF2334 データシートの表示（PDF） - RF Micro Devices
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RF2334 Datasheet PDF : 8 Pages
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RF2334
Pin Function Description
Interface Schematic
1
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
2
GND
Same as pin 1.
3
RF IN
RF input pin. This pin is NOT internally DC-blocked. A DC-blocking
capacitor, suitable for the frequency of operation, should be used in
most applications. DC coupling of the input is not allowed, because this
will override the internal feedback loop and cause temperature instabil-
ity.
4
GND
Same as pin 1.
5
RF OUT RF output and bias pin. Biasing is accomplished with an external series
resistor and choke inductor to VCC. The resistor is selected to set the
DC current into this pin to a desired level. The resistor value is deter-
mined by the following equation:
RF OUT
R = (---V----S---U---P---P----L---Y----–----V----D----E---V---I--C----E---)
ICC
RF IN
Care should also be taken in the resistor selection to ensure that the
current into the part never exceeds 68mA over the planned oper-
ating temperature. This means that a resistor between the supply and
this pin is always required, even if a supply near 4.8V is available, to
provide DC feedback to prevent thermal runaway. Because DC is
present on this pin, a DC blocking capacitor, suitable for the frequency
of operation, should be used in most applications. The supply side of
the bias network should also be well bypassed.
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P1-1
P1
1 VCC
2 GND
3 NC
1
C1
2
J1
50 Ω μstrip 100 pF
RF IN
3
R1
22 Ω
C3
100 pF
C4
1 μF
VCC
P1-1
L1
100 nH
50 Ω μstrip
5
C2
100 pF
J2
RF OUT
4
233X410-
Rev A10 030415
4-273
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