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Product Description
Ordering Information
Typical Applications
Features
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
Optimum Technology Matching® Applied
Si BJT
GaAs MESFET
GaAs HBT
Si Bi-CMOS
SiGe HBT
Si CMOS
1
2
3
4
8
7
6
5
IF+
IF-
GND
LO+
RF OUT
VCC
GND
LO-
RF9908
CDMA/FM UPCONVERTER/BPSK MODULATOR
• CDMA/FM Cellular Systems
• Supports Dual-Mode AMPS/CDMA
• Supports Dual-Mode TACS/CDMA
• Commercial and Consumer Systems
• 3-Cell Battery-Operated Systems
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 50
Ω 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.
• Supports Dual Mode Operation
• +8dBm Input/Output Intercept Point
• Single 3.6V Power Supply
• Internally Matched Inputs and Outputs
• Buffered Output
• Double-Balanced Mixer
RF9908
CDMA/FM Upconverter/BPSK Modulator
RF9908 PCBA
Fully Assembled Evaluation Board
6
Rev A2 010720
0.244
0.229
0.157
0.150
0.018
0.014
0.050
0.068
0.053
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding
mold flash.
3. Lead coplanarity -
0.005 with respect to datum "A".
Dimensions in mm
0.196
0.189
0.008
0.004
-A-
8° MAX
0° MIN
0.034
0.016
0.009
0.007
Package Style: SOIC-8
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