|
|
RF9908PCBAのメーカーはRF Micro Devicesです、この部品の機能は「CDMA/FM UPCONVERTER/BPSK MODULATOR」です。 |
部品番号 | RF9908PCBA |
| |
部品説明 | CDMA/FM UPCONVERTER/BPSK MODULATOR | ||
メーカ | RF Micro Devices | ||
ロゴ | |||
このページの下部にプレビューとRF9908PCBAダウンロード(pdfファイル)リンクがあります。 Total 4 pages
6
Typical Applications
• CDMA/FM Cellular Systems
• Supports Dual-Mode AMPS/CDMA
• Supports Dual-Mode TACS/CDMA
RF9908
CDMA/FM UPCONVERTER/BPSK MODULATOR
• Commercial and Consumer Systems
• 3-Cell Battery-Operated Systems
Product Description
The RF9908 is a complete upconverter designed for
CDMA/FM cellular applications. The IC contains a dou-
ble-balanced mixer stage and an output buffer amplifier
stage. This device may also be used to directly BPSK
modulate a carrier. The mixer is a Gilbert cell with emitter
degeneration resistors to provide high IP3. The output
stage is a class-B, push-pull configuration to reduce the
overall current and still provide a good 50Ω output match.
The unit operates at 3.6V and does not require any exter-
nal matching components other than coupling capacitors.
This circuit is designed as part of the RFMD CDMA Chip
Set, consisting of a Transmit IF AGC Amp, this Transmit
Upconverter, a Receive LNA/Mixer, and a Receive IF
AGC Amp.
Optimum Technology Matching® Applied
Si BJT
üGaAs HBT
GaAs MESFET
Si Bi-CMOS
SiGe HBT
Si CMOS
IF+ 1
IF- 2
GND 3
LO+ 4
8 RF OUT
7 VCC
6 GND
5 LO-
0.196
0.189
0.018
0.014
0.050
0.008
0.004
-A-
8° MAX
0° MIN
0.157
0.150
0.244
0.229
0.034
0.016
Dimensions in mm
0.068
0.053
0.009
0.007
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding
mold flash.
3. Lead coplanarity -
0.005 with respect to datum "A".
Package Style: SOIC-8
Features
• Supports Dual Mode Operation
• +8dBm Input/Output Intercept Point
• Single 3.6V Power Supply
• Internally Matched Inputs and Outputs
• Buffered Output
• Double-Balanced Mixer
Ordering Information
RF9908
CDMA/FM Upconverter/BPSK Modulator
RF9908 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
6
Rev A2 010720
6-57
1 Page RF9908
Pin
1
2
3
4
5
6
7
8
Function
IF+
IF-
GND
LO+
LO-
GND
VCC
RF OUT
Description
Interface Schematic
Balanced IF Input Pin. This pin is internally DC biased and should be
DC blocked if connected to a device with a DC level present. For single-
ended input operation, one pin is used as an input and the other IF
input is AC coupled to ground. The balanced, as well as single-ended,
input impedance is 265Ω.
IF+
IF-
BIAS
Same as pin 1, except complementary input.
See pin 1.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
Balanced LO Input Pin. This pin is internally DC biased and should be
DC blocked if connected to a device with a DC level present. For single-
ended input operation, one pin is used as an input and the other LO
input is AC coupled to ground. The balanced, as well single-ended,
input impedance is 50Ω.
LO+
BIAS
LO-
Same as pin 4, except complementary input.
Same as pin 3.
Supply Voltage pin. External bypassing is required. External RF, LO,
and IF bypassing is required. The trace length between the pin and the
bypass capacitors should be minimized. The ground side of the bypass
capacitors should connect immediately to ground plane.
RF Output Pin. This pin is internally DC blocked. The output impedance
is 50Ω.
See pin 4.
RF OUT
6
Application Schematic
IF+
IF-
LO+
1 nF
1 nF
1
2
100 pF
3
4
8 RF OUT
VCC
7
100 pF 100 nF
6
5
100 pF
Rev A2 010720
6-59
3Pages | |||
ページ | 合計 : 4 ページ | ||
|
PDF ダウンロード | [ RF9908PCBA データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
RF9908PCBA | CDMA/FM UPCONVERTER/BPSK MODULATOR | RF Micro Devices |