RF2498PCBA-41X View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF2498PCBA-41X' PDF : 22 Pages View PDF
RF2498
Pin Function Type Description
Interface Schematic
15
MIX GAIN
DI Logic input. Logic high turns on PCS or cellular mixer preamp and
provides maximum gain. Logic low will bypass the PCS and cellu-
lar mixer preamp.
MIX GAIN
16
ENABLE
DI Logic input. Low level powers down the IC.
ENABLE
17
LNA GAIN
DI Logic input. High activates cellular or PCS LNAs. Low selects LNA
bypass mode for both bands.
LNA GAIN
18
CELL LNA
AO Cellular LNA output. Simple external L-C components required for See pin 20.
OUT
matching and VCC supply.
19
CELL LNA
AO Cellular LNA emitter. A small inductor connects this pin to ground. See pin 20.
EMITTER
Cellular LNA gain can be adjusted by the inductance.
20 CELL LNA IN AI Cellular LNA input.
VCC
CELL LNA IN
CELL LNA OUT
21 PCS LNA OUT AO PCS LNA output. Simple external L-C components required for
matching and VCC supply.
CELL LNA EMITTER
PCS LNA IN
VCC
PCS LNA OUT
22
IP SET
DI Logic input. High selects high IIP3 LNA “boost” modes for GPS,
cellular and PCS CDMA paths. Low selects “normal” LNA IIP3
mode for GPS, cellular and PCS CDMA paths. Bias setting resistor
at pin 31 allows for the adjustment of LNA IIP3 in boost mode.
IP SET
23 PCS LNA IN AI PCS LNA input. For best performance, simple external matching See pin 21.
required.
24 GPS LNA IN AI GPS LNA input. For best performance, simple external matching
required.
VCC
GPS LNA OUT
GPS LNA IN
25 GPS LNA OUT AO GPS LNA output. Simple external L-C components required for
matching and VCC supply.
See pin 24.
26
IF SEL
DI Logic input. High selects CDMA IF outputs; low selects FM or GPS
IF outputs.
IF SEL
27
BAND SEL
DI Logic input. High level selects PCS or GPS band; low level selects
cellular band. The LO divider circuitry is disabled when BAND SEL
is high, regardless of the state of pin 10 (/2 SELECT). When BAND
SEL is low, pin 10 can be selected high or low. If using a single LO
input, pin 10 can be tied to a low state allowing BAND SEL to con-
trol the LO divider function.
BAND SEL
Rev A3 DS030711
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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