RF2489
Pin
16
17
Function
GND
PCS LNA OUT
Description
Low-inductance ground required.
Interface Schematic
PCS LNA output. Small external inductance required for best impedance
match to 50Ω.
VCC
PCS LNA OUT
PCS LNA IN
PCS LNA VCC connection. A series inductance required for matching.
Low-inductance ground required.
18
19
20
21
22
VCC2
GND
PCS LNA IN
GND
PCS LNA input. Simple external matching required for best performance.
Low-inductance ground required.
See pin 17.
Cellular LNA input. Simple external matching required for best perfor-
mance.
CELL LNA IN
VCC
CELL LNA OUT
CELL LNA IN
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.
23
24
CELL LNA
EMITTER
CELL LNA
OUT
Cellular LNA output. Simple external L-C matching required.
See pin 22.
Resistor to ground sets both LNA and mixer currents. Lower resistance
results in lower currents for both the LNA and mixer.
25
26
ISET1
Resistor to ground sets LNA current. Higher resistance results in lower cur-
rent.
ISET2
Low-inductance ground required.
27
28
GND
CELL MIX IN
Cellular mixer RF single-end input. External L-C network required for best
performance.
CELL MIX IN
VCC for internal references, logic, and mixer preamplifiers. Internal RF
bypass capacitor. External bypass capacitor between 1nF and 47nF
required.
29
30
VCC1
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.
BAND SEL
BAND SEL
Logic input. High selects external LNA current reference set by the resistor
connected from ISET2 to ground.
31
32
IP SET
IF SEL
IP SET
IF SEL
Logic input. High selects FM IF outputs; low selects CDMA IF outputs.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A21 DS070308
11 of 30
RFMD [ RF MICRO DEVICES ]
