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參數(shù)資料
| 型號： | RF2870PCBA |
| 廠商： | RF Micro Devices, Inc. |
| 英文描述： | CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER |
| 中文描述： | CDMA的低噪聲放大器/混頻器900MHz的下變頻器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 400K |
| 代理商： | RF2870PCBA |
8-5
RF2870
Rev A8 030507
Pin
1
Function
IF OUT+
Description
CDMA IF output. Open collector.
Interface Schematic
2
3
4
IF OUT-
GND
LO IN
CDMA IF output. Open collector.
See pin 1.
LO single-end input. Matched to 50
.
5
6
7
VCC
LO OUT
TX BUFF
ENABLE
External bypass capacitor may be required.
LO output. Internal DC block. Drives 50
.
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
LNA OUT
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
Cellular LNA output. Simple external L-C components required for
matching and VCC supply.
Logic input. See Gain Control State table.
See pin 10.
13
MIX GAIN
14
ISET2
An external resistor R2 connected to this pin sets the current of the
mixer. Decreasing resistance increases current.
Sets internal voltage reference. External resistor required.
Cellular mixer RF single-end input. Matched to 50
.
15
16
ISET1
MIX IN
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
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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