RF2489 Ver la hoja de datos (PDF) - RF Micro Devices
Número de pieza
componentes Descripción
Lista de partido
RF2489 Datasheet PDF : 16 Pages
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Preliminary
RF2489
Pin Function Description
Interface Schematic
1
FM+
FM IF output. Open collector. “Current combiner” IF interface to SAW
filter recommended.
FM+
FM-
2
FM-
FM IF output. Open collector. “Current combiner” IF interface to SAW See pin 1.
filter recommended.
3
CDMA+ CDMA IF output. Open collector.
CDMA+
CDMA-
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.
6
LO IN
LO single-end input. Internal DC block.
LO IN
8
7
PCS LO PCS LO output. Internal DC block. If a single TX VCO is required, pins
OUT
7 and 8 can be tied together and used as one LO output. (See applica-
tion note 1.)
8
CELL LO Cellular LO output. Internal DC block. (See application note 1.)
OUT
9
VCC3
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.
ENABLE
11 TX BUFFER Logic input. High enables TX LO buffer amplifiers.
ENABLE
TX BUF
12
GND
Low-inductance ground required.
13 PCS MIX IN PCS mixer RF single-end input.
PCS MIX IN
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.
MIX GAIN
LNA GAIN
Rev A10 011017
8-41
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