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RF2498
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.
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.
16
ENABLE
DI
Logic input. Low level powers down the IC.
17
LNA GAIN
DI
Logic input. High activates cellular or PCS LNAs. Low selects LNA
bypass mode for both bands.
18
CELL LNA
OUT
AO
Cellular LNA output. Simple external L-C components required for
matching and VCC supply.
See pin 20.
19
CELL LNA
EMITTER
AO
Cellular LNA emitter. A small inductor connects this pin to ground.
Cellular LNA gain can be adjusted by the inductance.
See pin 20.
20
CELL LNA IN
AI
Cellular LNA input.
21
PCS LNA OUT
AO
PCS LNA output. Simple external L-C components required for
matching and VCC supply.
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.
23
PCS LNA IN
AI
PCS LNA input. For best performance, simple external matching
required.
See pin 21.
24
GPS LNA IN
AI
GPS LNA input. For best performance, simple external matching
required.
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.
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.
MIX GAIN
ENABLE
LNA GAIN
CELL LNA IN
V
CC
CELL LNA OUT
CELL LNA EMITTER
PCS LNA IN
V
CC
PCS LNA OUT
IP SET
GPS LNA IN
V
CC
GPS LNA OUT
IF SEL
BAND SEL
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