8-6
RF2861
Rev A3 050902
Pin
Function
Type Description
Interface Schematic
1G2
DI
Gain control logic input. See logic control table.
2
LNA IN
AI
Cellular LNA input.
3
LNA
EMITTER
AO
Cellular LNA emitter. A small inductor connects this pin to
ground. Cellular LNA gain can be adjusted by the inductance.
See pin 2.
4
LNA OUT
AO
Cellular LNA output. Simple external L-C components
required for matching and VCC supply.
See pin 2.
5
ISET2
AO
An external resistor connected to this pin sets the current of
the mixer. Increasing resistance decreases current.
6
ISET1
AO
An external resistor connected to this pin sets the current of
the LNA. Increasing resistance decreases current.
7G1
DI
Gain control logic input. See logic control table.
8
MIX IN
AI
Cellular mixer RF single-end input.
9IF OUT+
AO
CDMA IF output. Open collector.
10
IF OUT-
AO
CDMA IF output. Open collector.
See pin 9.
11
GND
P
Ground.
12
LO IN
AI
LO single-end input. Matched to 50
Ω.
13
VCC
P
LO amplifier VCC external bypass capacitor may be required.
14
LO OUT
AO
LO output. Internal DC block. Drives 50
Ω.
15
TX BUFF
ENABLE
DI
Logic input. High enables TX LO output buffer amplifiers.
16
ENABLE
DI
Logic input. Low level powers down the IC.
Pkg
Base
GND
P
Ground connection. The backside of the package should be
soldered to a top side ground pad which is connected to the
ground plane with multiple vias.
Legend:
DI=Digital Input from Baseband Chip
AI=Analog Input
P=VCC or GND
AO=Analog Output
G2
LNA IN
V
CC
LNA OUT
LNA EMITTER
G1
MIX IN
IF OUT+
IF OUT-
LO IN
70
Ω
TX BUFF ENABLE
ENABLE
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