RF9957
7
Typical Applications
• CDMA/FM Cellular Systems
• CDMA PCS Systems
• Wireless Local Loop Systems
• Spread-Spectrum Cordless Phones
• High Speed Data Modems
• General Purpose Digital Receivers
CDMA/FM RECEIVE AGC AND DEMODULATOR
Product Description
The RF9957 is an integrated complete IF AGC amplifier
and Quadrature Demodulator designed for the receive
section of dual-mode CDMA/FM cellular and PCS appli-
cations. It is designed to amplify received IF signals, while
providing 100dB of gain control range, and demodulate to
baseband I and Q signals. Noise Figure, IP
3
, and other
specifications are designed to be compatible with the IS-
98 and J-STD-018 Interim Standard for CDMA cellular
communications. The IC is manufactured on an advanced
15GHz F
T
Silicon Bipolar process, and is packaged in a
standard miniature 24-lead plastic SSOP package.
0.157
0.150
0.0098
0.0040
1
0.344
0.337
0.012
0.008
0.025
0.0688
0.0532
7
QUADRATURE
DEMODULATORS
0.2440
0.2284
8°MAX
0°MIN
0.050
0.016
0.0098
0.0075
Optimum Technology Matching® Applied
ü
Si BJT
Package Style: SSOP-24
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
Si Bi-CMOS
Features
• Supports Dual Mode Operation (CDMA
and FM)
FL+
GC
23
19
• Digitally Controlled Power Down Mode
• 2.7V to 3.3V Operation
16 Q OUT+
15 Q OUT-
CDMA IN+ 4
CDMA IN- 5
IN SEL 14
FM IN+ 8
FM IN- 9
Input
Select
Gain
Control
• Quadrature LO Divider
• IF AGC Amp with 100dB Gain Control
Quad.
÷2
13 LO+
12 LO-
21 I OUT+
Band Gap
Reference
22 I OUT-
Ordering Information
24
PD
18
FL-
10
BG OUT
RF9957
RF9957 PCBA
CDMA/FM Receive AGC and Demodulator
Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev C11 010622
7-27
RFMD [ RF MICRO DEVICES ]
