RF2628
6
Typical Applications
• CDMA/FM Cellular Systems
• Supports Dual-Mode AMPS/CDMA
• Supports Dual-Mode TACS/CDMA
• Commercial and Consumer Systems
• Battery-Operated Systems
CDMA/FM UPCONVERTER/BPSK MODULATOR
Product Description
The RF2628 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 IP
3
. 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 a supply voltage of 2.7V to 5.0V and
does not require any external matching components
other than coupling capacitors. This circuit is designed as
part of the RFMD CDMA Chip Set, consisting of a Trans-
mit IF AGC Amp, this Transmit Upconverter, a Receive
LNA/Mixer, and a Receive IF AGC Amp.
Optimum Technology Matching® Applied
0.192
+ 0.008
0.012
0.006
+ 0.003
-A-
0.0256
6
MIXERS
0.034
NOTES:
1. Shaded lead is pin 1.
2. All dimensions are exclusive of
flash, protrusions or burrs.
3. Lead coplanarity: 0.002 with
respect to datum "A".
0.118
+ 0.004 sq.
6° MAX
0° MIN
0.021
+ 0.004
0.006
+ 0.002
ü
Si BJT
Package Style: MSOP-8
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
Si Bi-CMOS
Features
• Supports Dual Mode Operation
• +9dBm Output Intercept Point
• Single 2.7V to 5.0V Power Supply
IF+
IF-
GND
LO BYPASS
1
2
3
4
8
7
6
5
RF OUT
VCC
GND
LO
• Internally Matched Inputs and Outputs
• Buffered Output
• Double-Balanced Mixer
Ordering Information
RF2628
RF2628 PCBA
CDMA/FM Upconverter/BPSK Modulator
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
Rev B4 010720
6-19
RFMD [ RF MICRO DEVICES ]
