RF2489
Pin
1
Function
FM+
Description
Interface Schematic
FM IF output. Open collector. “Current combiner” IF interface to SAW filter
recommended.
FM+
FM-
FM IF output. Open collector. “Current combiner” IF interface to SAW filter See pin 1.
recommended.
2
3
FM-
CDMA IF output. Open collector.
CDMA+
CDMA+
CDMA-
CDMA IF output. Open collector.
See pin 3.
4
5
CDMA-
/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.
LO single-end input. Internal DC block.
6
7
LO IN
LO IN
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 application note
1.)
PCS LO OUT
Cellular LO output. Internal DC block. (See application note 1.)
8
9
CELL LO OUT
VCC3
VCC connection for internal LO amplifiers. Internal RF bypass capacitor.
External bypass capacitor between 1nF and 47nF required.
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.
10
ENABLE
ENABLE
Logic input. High enables TX LO buffer amplifiers.
11
TX BUFFER
ENABLE
TX BUF
Low-inductance ground required.
PCS mixer RF single-end input.
12
13
GND
PCS MIX IN
PCS MIX IN
Logic input. Logic high turns on PCS or cellular mixer preamp and mixer
provides maximum gain. Logic low will bypass the PCS and cellular mixer
preamp.
14
15
MIX GAIN
LNA GAIN
MIX GAIN
LNA GAIN
Logic input. High activates CDMA or PCS LNAs. Low selects LNA bypass
mode for both bands.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
10 of 30
Rev A21 DS070308
RFMD [ RF MICRO DEVICES ]
