RF2909
11
Typical Applications
• Direct Sequence Spread Spectrum
• Spread Spectrum Cordless Phones
• Portable Battery Powered Equipment
• GMSK, QPSK, DQPSK, QAM Modulation
• 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°MAX
0°MIN
.050
.016
.010
.008
2
.069
.053
Optimum Technology Matching® Applied
ro
du
ct
Package Style: SSOP-24
P
ü
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
• 2.7V to 5V Power Supply
• 1mW, 10mW, 70mW Digital Output
Power
• 20dB Analog Power Control Range
• Excellent Phase & Amplitude Balance
• Compatible with the RF2908
11
TRANSCEIVERS
U
pg
r
VCC1 8
GND2 9
VCC2 10
DC
BIAS
PWR
CTRL
Σ
S
ee
ad
ed
24 I SIG
23 I REF
22 NC
+45°
-45°
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
RFMD [ RF MICRO DEVICES ]
