RF9958
5
Typical Applications
• CDMA/FM Cellular Systems
• CDMA PCS Systems
• Wireless Local Loop Systems
• Spread Spectrum Cordless Phones
• High Speed Data Modems
• General Purpose Digital Transmitters
CDMA/FM TRANSMIT MODULATOR, IF AGC,
AND UPCONVERTER
Product Description
The RF9958 is an integrated complete Quadrature Modu-
lator, IF AGC amplifier, and Upconverter designed for the
transmit section of dual-mode CDMA/FM cellular and
PCS applications. It is designed to modulate baseband I
and Q signals, amplify the resulting IF signals while pro-
viding 95dB of gain control range, and perform the final
upconversion to UHF. Noise Figure, IP
3
, and other specifi-
cations are designed to be compatible with the IS-98
Interim Standard for CDMA cellular communications. This
circuit is designed as part of RFMD’s newest CDMA Chip
Set, which also includes the RF9957 CDMA/FM Receive
IF AGC and Demodulator. The IC is manufactured on an
advanced 15GHz F
T
Silicon Bipolar process, and is sup-
plied in a 28-lead plastic SSOP package.
Optimum Technology Matching® Applied
PIN 1
INDENT
6.20
5.79
3.99
3.81
0.25
0.10
0.36
TYP
0.23
0.635
TYP
5
MODULATORS AND
UPCONVERTERS
10.01
9.80
7°
1.73
1.47
0.25
0.10
1.27
0.38
8°
0°
NOTES:
1. Shaded lead is Pin1.
2. Lead frame material: Copper 194
3. Mold flash shall not exceed 0.006 (0.15 mm) per end.
4. Interlead flash shall not exceed 0.010 (0.25 mm) per side.
5. All dimensions are excluding mold flash and protrusions.
ü
Si BJT
Package Style: QSOP-28
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
Si Bi-CMOS
Features
• Supports Dual Mode Operation
• Digitally Controlled Power Down Modes
MODE
GC
1
27
• 2.7V to 3.3V Operation
• Digital First LO Quadrature Divider
• Double-Balanced UHF Upconvert Mixer
• IF AGC Amp with 95 dB Gain Control
Q SIG 2
Q REF 3
LO1- 8
LO1+ 9
I REF 5
I SIG 4
Band Gap
Reference
Quad.
÷2
Gain
Control
Σ
25 MOD OUT+
24 MOD OUT-
21 MIX IN-
22 MIX IN+
Ordering Information
13
PD1
15
PD2
17
RF OUT
19
LO2+
20
LO2-
10
G OUT
RF9958
RF9958 PCBA
CDMA/FM Transmit Modulator, IF AGC, and Upcon-
verter
Fully Assembled Evaluation Board
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Rev B11 010720
5-93
RFMD [ RF MICRO DEVICES ]
