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RF2909

11

Typical Applications

鈥?Direct Sequence Spread Spectrum

鈥?Spread Spectrum Cordless Phones

鈥?Portable Battery Powered Equipment

鈥?GMSK, QPSK, DQPSK, QAM Modulation

鈥?915MHz ISM Applications

3V 915MHZ SPREAD-SPECTRUM

TRANSMITTER IC

Product Description

The RF2909 is a monolithic integrated transmitter IC

capable of universal direct modulation. The quadrature

modulator allows for a variety of modulation formats and

compound carriers. The transmitter has two power control

modes. Two inputs can be controlled digitally for stepping

output power 1mW, 10mW, or 70mW output power. Or,

the output level can be adjusted by an analog input from

1mW to 80mW. The quadrature mixers have differential

inputs, and are internally biased; a DC blocking capacitor

is required if external DC levels are present. The LO is

split with a passive network tuned for 915MHz.

1

.157

.150

.033

.010

.004

.344

.337

.012

.008

.025

R

F2

94

.244

.228

8擄MAX

0擄MIN

.050

.016

.010

.008

2

.069

.053

Optimum Technology Matching廬 Applied

ro

du

ct

Package Style: SSOP-24

P

眉

Si Bi-CMOS

Q SIG 1

Q REF 2

GND1 3

NC 4

LO IN+ 5

LO IN- 6

NC 7

Si BJT

GaAs HBT

SiGe HBT

GaAs MESFET

Si CMOS

Features

鈥?2.7V to 5V Power Supply

鈥?1mW, 10mW, 70mW Digital Output

Power

鈥?20dB Analog Power Control Range

鈥?Excellent Phase & Amplitude Balance

鈥?Compatible with the RF2908

11

TRANSCEIVERS

U

pg

r

VCC1 8

GND2 9

VCC2 10

DC

BIAS

PWR

CTRL

危

S

ee

ad

ed

24 I SIG

23 I REF

22 NC

+45擄

-45擄

21 GND6

20 GND5

19 RF OUT

18 GND4

17 GND3

16 PLLON

15 TX PD

14 PC 2

13 PC1

Ordering Information

RF2909

RF2909 PCBA

3V 915MHz Spread-Spectrum Transmitter IC

Fully Assembled Evaluation Board

INSTGT 11

APC 12

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 B1 010904

11-103

next

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