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RF2861
Rev A3 DS050902
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Pin
Function
Type Description
Interface Schematic
1G2
DI
Gain control logic input. See logic control table.
2LNA IN
AI
Cellular LNA input.
3LNA 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.
4LNA OUT
AO
Cellular LNA output. Simple external L-C components required for
matching and VCC supply.
See pin 2.
5ISET2
AO
An external resistor connected to this pin sets the current of the
mixer. Increasing resistance decreases current.
6ISET1
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.
G2
LNA IN
VCC
LNA OUT
LNA EMITTER
G1
MIX IN
IF OUT+
IF OUT-
LO IN
70
Ω
TX BUFF ENABLE
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