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參數(shù)資料
| 型號(hào)： | RF2861 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC16 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 173K |
| 代理商： | RF2861 |
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8-6
RF2861
Rev A2 040107
Pin
1
Function
G2
Type Description
DI
Gain control logic input. See logic control table.
Interface Schematic
2
LNA IN
AI
Cellular LNA input.
3
LNA
EMITTER
LNA OUT
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
AO
Cellular LNA output. Simple external L-C components
required for matching and VCC supply.
An external resistor connected to this pin sets the current of
the mixer. Increasing resistance decreases current.
An external resistor connected to this pin sets the current of
the LNA. Increasing resistance decreases current.
Gain control logic input. See logic control table.
See pin 2.
5
ISET2
AO
6
ISET1
AO
7
G1
DI
8
MIX IN
AI
Cellular mixer RF single-end input.
9
IF OUT+
AO
CDMA IF output. Open collector.
10
11
12
IF OUT-
GND
LO IN
AO
P
AI
CDMA IF output. Open collector.
See pin 9.
Ground.
LO single-end input. Matched to 50
.
13
14
15
VCC
LO OUT
TX BUFF
ENABLE
P
LO amplifier VCC external bypass capacitor may be required.
LO output. Internal DC block. Drives 50
.
AO
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.
DI=Digital Input from Baseband Chip
P=V
CC
or GND
Legend:
AI=Analog Input
AO=Analog Output
G2
LNA IN
V
CC
LNA OUT
LNA EMITTER
G1
MIX IN
IF OUT+
IF OUT-
LO IN
70
TX BUFF ENABLE
ENABLE
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