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RF9958

5

Typical Applications

鈥?CDMA/FM Cellular Systems

鈥?CDMA PCS Systems

鈥?Wireless Local Loop Systems

鈥?Spread Spectrum Cordless Phones

鈥?High Speed Data Modems

鈥?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鈥檚 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廬 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擄

1.73

1.47

0.25

0.10

1.27

0.38

8擄

0擄

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.

眉

Si BJT

Package Style: QSOP-28

GaAs HBT

SiGe HBT

GaAs MESFET

Si CMOS

Si Bi-CMOS

Features

鈥?Supports Dual Mode Operation

鈥?Digitally Controlled Power Down Modes

MODE

GC

1

27

鈥?2.7V to 3.3V Operation

鈥?Digital First LO Quadrature Divider

鈥?Double-Balanced UHF Upconvert Mixer

鈥?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.

梅2

Gain

Control

危

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

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