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8-414
RF2890
Rev A4 040421
Pin
Function
Type Description
Interface Schematic
1
CELL LNA
OUT
AO
Cellular LNA output. Simple external L-C components
required for matching and VCC supply.
See pin 3.
2
CELL 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 3.
3
CELL LNA
IN
AI
Cellular LNA input.
4
GPS LNA IN
AI
GPS LNA input. For best performance, simple external match-
ing required.
5VG1
DI
Logic input. See Gain Control Logic table.
6
GPS LNA
OUT
AO
GPS LNA output. Simple external L-C components required
for matching and VCC supply.
See pin 4.
7
GPS MIX IN
AI
GPS mixer RF single-end input. Externally matched to 50
Ω.
8VG2
DI
Logic input. See Gain Control Logic table.
9
BAND SEL
DI
Logic input. High level selects GPS band; low level selects cel-
lular band.
10
VCC1
P
VCC connection with internal RF bypass capacitor. External
bypass capacitor between 1nF and 47nF recommended.
11
LO IN
AI
LO single-end input. Matched to 50
Ω.
12
VCC2
DI
VCC connection with internal RF Bypass capacitor. External
bypass capacitor between 1nF and 47nF recommended.
13
LO OUT
AO
LO output. Internal DC block.
14
TX BUFF
ENAB
DI
Logic input. High enables TX LO output buffer amplifiers.
CELL LNA IN
V
CC
CELL LNA OUT
CELL LNA EMITTER
GPS LNA IN
V
CC
GPS LNA OUT
VG1
GPS MIX IN
VG2
BAND SEL
LO IN
70
Ω
TX BUFF ENAB
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