10 of 22
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
1GPS+
AO
GPS IF output. Open collector.
2GPS-
AO
GPS IF output. Open collector.
See pin 1.
3CDMA+
AO
CDMA IF output. Open collector.
4CDMA-
AO
CDMA IF output. Open collector.
See pin 3.
5FM+
AO
FM IF output. Open collector. “Current combiner” IF interface to
SAW filter recommended. (See “IF Output Matching Network” sec-
tion.)
6FM-
AO
FM IF output. Open collector. “Current combiner” IF interface to
SAW filter recommended. (See “IF Output Matching Network” sec-
tion.)
See pin 5.
7VCC2
P
VCC connection for internal LO amplifiers. Internal RF bypass
capacitor. External bypass capacitor between 1nF and 47nF
required.
8LO IN
AI
LO single-end input. Matched to 50
Ω.
9
LO OUT
AO
LO output. Internal DC block.
10
/2 SELECT
DI
Logic input. Low enables /2 circuitry in cellular mode.
The divider is disabled when BAND SEL (pin 27) is high, regard-
less 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 func-
tion, if using a single LO input source.
See pin 11.
11
TX BUFF
ENABLE
DI
Logic input. High enables TX LO output buffer amplifiers.
12
PCS RFA VCC
P
VCC connection for PCS mixer preamplifier.
13
PCS MIX IN
AI
PCS mixer RF single-end input.
14
CELL MIX IN
AI
Cellular mixer RF single-end input. Matched to 50
Ω.
GPS+
GPS-
CDMA+
CDMA-
FM+
FM-
LO IN
70
Ω
TX BUF
PCS MIX IN
CELL MIX IN
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