RF2489PCBA-41X Ver la hoja de datos (PDF) - RF Micro Devices
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RF2489PCBA-41X Datasheet PDF : 30 Pages
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RF2489
Pin Function Description
Interface Schematic
16
GND
Low-inductance ground required.
17 PCS LNA OUT PCS LNA output. Small external inductance required for best impedance
match to 50Ω.
PCS LNA IN
VCC
PCS LNA OUT
18
VCC2
PCS LNA VCC connection. A series inductance required for matching.
19
GND
Low-inductance ground required.
20
21
22
23
24
25
PCS LNA IN
GND
CELL LNA IN
CELL LNA
EMITTER
CELL LNA
OUT
ISET1
PCS LNA input. Simple external matching required for best performance.
Low-inductance ground required.
Cellular LNA input. Simple external matching required for best perfor-
NS mance.
See pin 17.
CELL LNA IN
VCC
CELL LNA OUT
IG CELL LNA EMITTER
Cellular LNA emitter. A small inductor connects this pin to ground. Cellular See pin 22.
LNA gain can be adjusted by the inductance.
S Cellular LNA output. Simple external L-C matching required.
See pin 22.
DE Resistor to ground sets both LNA and mixer currents. Lower resistance
26
27
28
ISET2
GND
CELL MIX IN
results in lower currents for both the LNA and mixer.
Resistor to ground sets LNA current. Higher resistance results in lower cur-
rent.
W Low-inductance ground required.
Cellular mixer RF single-end input. External L-C network required for best
NE performance.
CELL MIX IN
29
30
31
VCC1
OR BAND SEL
NOT F IP SET
VCC for internal references, logic, and mixer preamplifiers. Internal RF
bypass capacitor. External bypass capacitor between 1nF and 47nF
required.
Logic input. High level selects PCS band; low level selects cellular band.
The LO divider circuitry is disabled when BAND SEL is high, regardless of
the state of pin 5 (/2 SELECT). When BAND SEL is low, pin 5 can be
selected high or low. If using a single LO input, pin 5 can be tied to a high
state allowing BAND SEL to control the LO divider function.
Logic input. High selects external LNA current reference set by the resistor
connected from ISET2 to ground.
BAND SEL
IP SET
32
IF SEL
Logic input. High selects FM IF outputs; low selects CDMA IF outputs.
IF SEL
Rev A21 DS070308
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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