RF2498PCBA 데이터 시트보기 (PDF) - RF Micro Devices
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RF2498PCBA Datasheet PDF : 20 Pages
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Pin Function Type Description
1
GPS+
AO GPS IF output. Open collector.
RF2498
Interface Schematic
GPS+
GPS-
2
GPS-
AO GPS IF output. Open collector.
3
CDMA+
AO CDMA IF output. Open collector.
See pin 1.
CDMA+
4
5
6
7
CDMA-
FM+
FM-
VCC2
AO
AO
AO
P
S CDMA IF output. Open collector.
N FM IF output. Open collector. “Current combiner” IF interface
to SAW filter recommended. (See “IF Output Matching Net-
G work” section.)
See pin 3.
FM+
SI FM IF output. Open collector. “Current combiner” IF interface
E to SAW filter recommended. (See “IF Output Matching Net-
work” section.)
D VCC connection for internal LO amplifiers. Internal RF bypass
See pin 5.
8
9
LO IN
LO OUT
AI
AO
capacitor. External bypass capacitor between 1nF and 47nF
required.
LO single-end input. Matched to 50Ω.
NEW LO output. Internal DC block.
LO IN
70 Ω
10
11
/2 SELECT
FOR TX BUFF
DI Logic input. Low enables /2 circuitry in cellular mode.
The divider is disabled when BAND SEL (pin 27) is high,
regardless of the state of pin 10. The divider can only be
enabled when BAND SEL is low and pin10 is low. Pin 10 can
be tied to a low state allowing BANDSEL (pin 27) to control the
LO divider function, if using a single LO input source.
DI Logic input. High enables TX LO output buffer amplifiers.
See pin 11.
ENABLE
T 12 PCS RFA
VCC
NO 13 PCS MIX IN
P VCC connection for PCS mixer preamplifier.
AI PCS mixer RF single-end input.
TX BUF
PCS MIX IN
CDMA-
FM-
14
CELL MIX AI Cellular mixer RF single-end input. Matched to 50Ω.
IN
CELL MIX IN
Rev A4 070308
8-309
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