RF2637 Ver la hoja de datos (PDF) - RF Micro Devices
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RF2637 Datasheet PDF : 10 Pages
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RF2637
Pin Function Description
Interface Schematic
1
IN+
CDMA balanced input pin. This pin is internally DC-biased and should be
BIAS
DC-blocked if connected to a device with a DC level other than VCC
present. A DC to connection to VCC is acceptable. For single-ended input
operation, one pin is used as an input and the other CDMA input is AC-cou-
700 Ω
700 Ω
pled to ground. The balanced input impedance is 1kΩ, while the single-
CDMA+
CDMA-
ended input impedance is 500Ω.
2
IN-
Same as pin 2, except complementary input.
See pin 1.
3
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
4
GC
Analog gain adjustment for all amplifiers. Valid control ranges are from 0V
to 2.5V. Maximum gain is selected with 2.5V. Minimum gain is selected
VCC
with 0V. These voltages are only valid for a 4.7kΩ DC source impedance.
12.7 kΩ
23.5 kΩ
15 kΩ
5
OUT-
Balanced output pin. This is an open-collector output, designed to operate
into a 250Ω balanced load. The load sets the operating impedance, but an
external choke or matching inductor to VCC must also be supplied in order
OUT+
OUT-
to correctly bias this output. This bias inductor is typically incorporated in
the matching network between the output and next stage. Because this pin
is biased to VCC, a DC-blocking capacitor must be used if the next stage’s
input has a DC path to ground.
6
OUT+
Same as pin 5, except complementary output.
See pin 5.
7
VCC2
Supply voltage pin. External bypassing is required. 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.
8
VCC1
Same as pin 7.
See pin 7.
Rev A5 DS050829
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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