Preliminary
8-41
RF2489
Rev A10 011017
8
Pin
Function
Description
Interface Schematic
1FM+
FM IF output. Open collector. “Current combiner” IF interface to SAW
filter recommended.
2FM-
FM IF output. Open collector. “Current combiner” IF interface to SAW
filter recommended.
See pin 1.
3
CDMA+
CDMA IF output. Open collector.
4
CDMA-
CDMA IF output. Open collector.
See pin 3.
5
/2 SELECT
Enable /2 circuitry in cellular mode. High enables /2 circuitry.
The divider is disabled when BAND SEL (pin 30) is high, regardless of
the state of pin 5. The divider can only be enabled when BAND SEL is
low and pin 5 is high. Pin 5 can be tied to a high state allowing BAND
SEL (pin 30) to control the LO divider function, if using a single LO
input source.
6LO IN
LO single-end input. Internal DC block.
7PCS LO
OUT
PCS LO output. Internal DC block. If a single TX VCO is required, pins
7 and 8 can be tied together and used as one LO output. (See applica-
tion note 1.)
8CELL LO
OUT
Cellular LO output. Internal DC block. (See application note 1.)
9VCC3
VCC connection for internal LO amplifiers. Internal RF bypass capaci-
tor. External bypass capacitor between 1nF and 47nF required.
10
ENABLE
Logic input. Low level powers down IC.
IC can be shut down by setting pins 30 and 32 high and TX Buffer
Enable low as well.
11
TX BUFFER
ENABLE
Logic input. High enables TX LO buffer amplifiers.
12
GND
Low-inductance ground required.
13
PCS MIX IN PCS mixer RF single-end input.
14
MIX GAIN
Logic input. Logic high turns on PCS or cellular mixer preamp and
mixer provides maximum gain. Logic low will bypass the PCS and cellu-
lar mixer preamp.
15
LNA GAIN
Logic input. High activates CDMA or PCS LNAs. Low selects LNA
bypass mode for both bands.
FM+
FM-
CDMA+
CDMA-
LO IN
ENABLE
TX BUF
PCS MIX IN
MIX GAIN
LNA GAIN
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