RF2498PCBA 데이터 시트보기 (PDF) - RF Micro Devices
부품명
상세내역
일치하는 목록
RF2498PCBA Datasheet PDF : 20 Pages
| |||
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 cellular mixer preamp.
MIX GAIN
16
ENABLE
DI Logic input. Low level powers down the IC.
ENABLE
17 LNA GAIN
18 CELL LNA
OUT
19 CELL LNA
EMITTER
20 CELL LNA
IN
21 PCS LNA
OUT
22
IP SET
23 PCS LNA IN
24 GPS LNA IN
25 GPS LNA
OUT
T 26
IF SEL
NO 27 BAND SEL
DI Logic input. High activates cellular or PCS LNAs. Low selects
LNA bypass mode for both bands.
AO
AO
AI
AO
LNA GAIN
S Cellular LNA output. Simple external L-C components
required for matching and VCC supply.
See pin 20.
N Cellular LNA emitter. A small inductor connects this pin to
See pin 20.
ground. Cellular LNA gain can be adjusted by the inductance.
G Cellular LNA input.
SI CELL LNA IN
VCC
CELL LNA OUT
E PCS LNA output. Simple external L-C components required
D for matching and VCC supply.
CELL LNA EMITTER
VCC
DI
W Logic input. High selects high IIP3 LNA “boost” modes for
GPS, cellular and PCS CDMA paths. Low selects “normal”
E LNA IIP3 mode for GPS, cellular and PCS CDMA paths. Bias
setting resistor at pin 31 allows for the adjustment of LNA IIP3
N in boost mode.
AI PCS LNA input. For best performance, simple external match-
ing required.
R AI GPS LNA input. For best performance, simple external match-
FOing required.
AO GPS LNA output. Simple external L-C components required
PCS LNA IN
IP SET
See pin 21.
VCC
GPS LNA IN
See pin 24.
PCS LNA OUT
GPS LNA OUT
for matching and VCC supply.
DI Logic input. High selects CDMA IF outputs; low selects FM or
GPS IF outputs.
IF 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.
BAND SEL
8-310
Rev A4 070308
Share Link: 