8-310
RF2498
Rev A4 070308
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 cellular 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 match-
ing required.
See pin 21.
24
GPS LNA IN
AI
GPS LNA input. For best performance, simple external match-
ing 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 control the LO divider func-
tion.
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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