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PDF RF2909 Data sheet ( Hoja de datos )

Número de pieza RF2909
Descripción 3V 915MHZ SPREAD-SPECTRUM TRANSMITTER IC
Fabricantes RF Micro Devices 
Logotipo RF Micro Devices Logotipo



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11
Typical Applications
• Direct Sequence Spread Spectrum
• Spread Spectrum Cordless Phones
• Portable Battery Powered Equipment
RF2909
3V 915MHZ SPREAD-SPECTRUM
TRANSMITTER IC
• GMSK, QPSK, DQPSK, QAM Modulation
• 915MHz ISM Applications
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.
.157
.150
1
.344
.337
.033
.012
.008
.025
.244
.228
8°MAX
0°MIN
.050 .010
.016 .008
.010
.004
.069
.053
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
Q SIG 1
24 I SIG
Q REF 2
GND1 3
23 I REF
+45°
-45° 22 NC
NC 4
LO IN+ 5
Σ
21 GND6
20 GND5
LO IN- 6
19 RF OUT
NC 7
18 GND4
VCC1 8
17 GND3
GND2 9
VCC2 10
INSTGT 11
APC 12
DC
BIAS
16 PLLON
15 TX PD
PWR
CTRL
14 PC 2
13 PC1
Package Style: SSOP-24
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
Ordering Information
RF2909
3V 915MHz Spread-Spectrum Transmitter IC
RF2909 PCBA Fully Assembled Evaluation Board
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
11
Rev B1 010904
11-103

1 page




RF2909 pdf
Pin Function Description
19 RF OUT Power Amp output, open collector output.
RF2909
Interface Schematic
INSTGT
RF OUT
20
GND5
Same as pin 17.
21
GND6
Same as pin 17.
22 NC
23
I REF
Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. To obtain a carrier suppres- I SIG
sion of better than 25dB it may be tuned ±0.15V (relative to the I SIG
DC voltage). Without tuning, the carrier suppression will typically be
better than 25dB. The input impedance of this pin is 3k.
BIAS
24
I SIG
Baseband input to the I mixer. A DC bias of approximately 1.7V is
See pin 23.
present at this pin.A DC blocking capacitor is needed if the signal has a
different DC level. Maximum output power is obtained when the input
signal has a peak to peak amplitude of 1V. The input impedance of this
pin is about 3 k. The REF and SIG inputs are interchangeable. If
swapping the I SIG and I REF pins, the Q SIG and Q REF also need to
be swapped to maintain the correct phase. The SIG and REF pins may
be driven differentially to increase conversion gain.
I REF
Table I
Operation TX PLL
Mode
PD ON
Sleep Mode
Low Low
PLL Buffer
Low High
Linear Po Mode High High
Digital Po Mode High High
Medium Power High High
High Power
High High
PC 1
Low
Low
Low
Low
High
Low
PC 2
Low
Low
Low
Low
Low
High
APC
0V
0V
0-Vcc V
0V
0V
0V
Function
Entire chip is powered down. Total Icc<1µA.
LO Buffer is on. Icc=1.5mA
Transmitter in on. Power output is proportional to APC.
Transmitter is on. Power out is 1mW.
Transmitter is on. Power out is 10mW.
Transmitter is on. Power out is 70mW.
11
Rev B1 010904
11-107

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