RF3404 Ver la hoja de datos (PDF) - RF Micro Devices
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Lista de partido
RF3404 Datasheet PDF : 12 Pages
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Preliminary
RF3404
Pin Function Description
Interface Schematic
24
FM IF+
FM IF output. Open collector. “Current combiner” IF interface to SAW
FM+
FM-
filter recommended.
25
FM IF-
FM IF output. Open collector. “Current combiner” IF interface to SAW See pin 24.
filter recommended.
26
DIVIDER Logic input. High enable frequency divide by 2 circuitry in cellular
ENABLE mode.
27
LO IN
LO single-end input. Internal DC block.
LO IN
28
GND
Low-inductance ground required.
29
ENABLE Logic input. Low level shuts down IC. IC can be shut down by setting
pins 44 and 45 high and TX Buffer Enable low as well.
ENABLE
30 TX BUFFER Logic input. High enables TX LO buffer amplifiers.
ENABLE
TX BUF
8
31
LNA GAIN Logic input. Controls LNA bypass switch. High selects maximum LNA
gain.
LNA GAIN
32
GND
Low-inductance ground required.
33
GND
Low-inductance ground required.
34
GND
Low-inductance ground required.
35
GND
Low-inductance ground required.
36
GND
Low-inductance ground required.
37
GND
Low-inductance ground required.
38
GND
Low-inductance ground required.
39
GND
Low-inductance ground required.
40
GND
Low-inductance ground required.
41
GND
Low-inductance ground required.
42
GND
Low-inductance ground required.
43
VCC4
VCC connection for internal references, logic, and mix preamps. Inter-
nal RF bypass capacitor. External bypass capacitor between 1nF and
47nF may be required.
44 BAND SEL Logic input. High level selects PCS band; lower level selects cellular
band.
BAND SEL
45
IF SEL
Logic input. High selects FM IF outputs in cellular mode; low selects
CDMA IF outputs.
IF SEL
Rev A1 010918
8-39
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