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8-5
RF2870
Rev A8 030507
Pin
Function
Description
Interface Schematic
1
IF OUT+
CDMA IF output. Open collector.
2IF OUT-
CDMA IF output. Open collector.
See pin 1.
3GND
4LO IN
LO single-end input. Matched to 50
Ω.
5VCC
External bypass capacitor may be required.
6LO OUT
LO output. Internal DC block. Drives 50
Ω.
7
TX BUFF
ENABLE
Logic input. High enables TX LO output buffer amplifiers.
8
ENABLE
Logic input. Low level powers down the IC.
9
LNA GAIN
Logic input. See Gain Control State table.
10
LNA IN
Cellular LNA input.
11
LNA
EMITTER
Cellular LNA emitter. A small inductor connects this pin to ground. Cel-
lular LNA gain can be adjusted by the inductance.
See pin 10.
12
LNA OUT
Cellular LNA output. Simple external L-C components required for
matching and VCC supply.
See pin 10.
13
MIX GAIN
Logic input. See Gain Control State table.
14
ISET2
An external resistor R2 connected to this pin sets the current of the
mixer. Decreasing resistance increases current.
15
ISET1
Sets internal voltage reference. External resistor required.
16
MIX IN
Cellular mixer RF single-end input. Matched to 50
Ω.
Pkg
Base
GND
Ground connection. The backside of the package should be soldered to
a top side ground pad which is connected to the ground plane with mul-
tiple vias.
CDMA+
CDMA-
LO IN
70
Ω
TX BUF
ENABLE
LNA GAIN
CELL LNA IN
V
CC
CELL LNA OUT
CELL LNA EMITTER
MIX GAIN
CELL MIX IN
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