Preliminary
8
Typical Applications
• CDMA/FM Cellular Systems
• Supports Dual-Mode CDMA/AMPS
• Supports Dual-Mode CDMA/TACS
RF2449
CDMA/FM LOW NOISE AMPLIFIER/MIXER
900MHZ DOWNCONVERTER
• General Purpose Downconverter
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
Product Description
The RF2449 is a receiver front-end designed for the
receive section of dual-mode CDMA/FM cellular applica-
tions. It is designed to amplify and downconvert RF sig-
nals, while providing 30dB of stepped gain control range.
Features include digital control of LNA gain, mixer gain,
LNA IIP3, and power down mode. Another feature of the
chip is adjustable IIP3 of the LNA and mixer using an off-
chip current setting resistor. The LNA IIP3 can be digitally
controlled between two levels to reduce current draw in
CDMA standby and other conditions where high IIP3 is
not required. Noise Figure, IP3, and other specs are
designed to be compatible with the IS-98 specification for
CDMA cellular communications. The IC is manufactured
on an advanced Silicon Bipolar process and packaged in
an SSOP-24.
Optimum Technology Matching® Applied
Si BJT
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
24 LO IN
23 GND2
22 GND2
21 VCC2
20 IF2+
19 IF2-
18 BYPASS
17 IF1-
16 IF1+
15 GND3A
14 MIX IN
13 GND3B
0.157
0.150
0.0098
0.0040
1
0.344
0.337
0.012
0.008
0.025
0.0688
0.0532
0.2440
0.2284
8°MAX
0°MIN
8
0.0098
0.0075
0.050
0.016
Package Style: SSOP-24
!
Si Bi-CMOS
ENABLE 1
IP SET 2
IF SEL 3
LNA GAIN 4
MIX GAIN 5
LNA IN 6
VCC1 7
GND1B 8
GND1A 9
LNA OUT 10
11
12
Features
• Complete Receiver Front-End
• Stepped LNA/Mixer Gain Control
• Adjustable LNA/Mixer Bias Current
• Adjustable LNA/Mixer IIP3
• Digital LNA IIP3 Control
• Meets IS-98 IMD and Single Tone
Ordering Information
RF2449
RF2449 PCBA
CDMA/FM Low Noise Amplifier/Mixer 900MHz
Downconverter
Fully Assembled Evaluation Board
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Functional Block Diagram
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Rev A4 001016
8-75
FRONT-ENDS
RFMD [ RF MICRO DEVICES ]
