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參數(shù)資料
| 型號(hào)： | RF2475 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | DUAL-BAND LOW NOISE AMPLIFIER/MIXER WITH FREQUENCY DOUBLER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC28 |
| 封裝： | 5 X 5 MM, LCC-28 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 547K |
| 代理商： | RF2475 |
Preliminary
8-94
RF2475
Rev A2 010918
8
F
NOTE:
The LO doubler is enabled by either MXR VCC19 (PCS RX mode) or TX LO19 (PCS TX mode). VCC DOUBLER is the
DC current return path for the output of the doubler. This should be connected to the PLL VCC or a supply that is on in
both the TX and RX modes of the 1900MHz band of operation. In the Cellular mode, the doubler is powered down to
save current, even when VCC DOUBLER is energized. Therefore, the VCC DOUBLER pin can be connected to a supply
that is on in all modes, while minimizing the current consumption of the device.
Pin
1
2
Function
LNA VCC19
GND
Description
PCS LNA supply voltage. Local bypass capacitor required.
Interface Schematic
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
PCS LNA input. AC-coupled. Requires external 50
matching compo-
nents.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Cellular LNA input. AC-coupled. Requires external 50
matching com-
ponents.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Gain select control input. Logic high=high gain, logic low=low gain.
3
LNA IN19
4
GND
5
LNA IN8
6
GND
7
8
9
10
GAIN SEL
LNA VCC8
LNA OUT
GND
Cellular LNA RF supply voltage. Local bypass capacitor required.
Cellular LNA output. AC-coupled. Requires matching to 50
.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
PCS mixer and RX LO doubler enable supply voltage. Local bypass
capacitor required.
Cellular RF mixer input. AC-coupled. Requires matching to 50
.
PCS Transmit LO buffer output. Requires matching to 50
.
PCS TX LO buffer and TX LO doubler enable supply voltage. Local
bypass capacitor required.
Doubler output supply voltage for PCS RX and PCS TX modes. See
Note 1.
11
GND
12
MXR VCC19
13
14
15
MXR IN8
TX LO19
VCC TX19
16
VCC
DOUBLER
GND
17
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Mixer IF B output. Open collector output, requires external matching
components and DC connection to VCC.
Mixer IF A output. Open collector output, requires external matching
components and DC connection to VCC.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Mixer LO input. AC-coupled. Requires matching to 50
.
Cellular TX LO buffer supply voltage. Local bypass capacitor required.
18
IF B
19
IF A
20
GND
21
22
23
24
25
26
LO IN8
VCC TX8
TX LO8
MXR IN19
MXR VCC8
GND
Cellular TX LO buffer output. AC-coupled. Requires matching to 50
.
PCS RF mixer input. AC-coupled. Requires matching to 50
.
Cellular mixer supply voltage. Local bypass capacitor required.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
PCS LNA output. AC-coupled. Requires matching to 50
.
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. The pad should have a short thermal path to the ground
plane.
27
GND
28
Pkg
Base
LNA OUT19
GND
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