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PDF RF2721 Data sheet ( Hoja de datos )
| Número de pieza | RF2721 | |
| Descripción | QUADRATURE DEMODULATOR | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Preliminary
2
RF2721
QUADRATURE DEMODULATOR
Typical Applications
• UHF Digital and Analog Receivers
• Commercial and Consumer Systems
• Digital Communication Systems
• Portable Battery-Powered Equipment
• Spread-Spectrum Communication Systems • General Purpose Frequency Conversion
Product Description
The RF2721 is a monolithic integrated quadrature
demodulator intended for use in digital mobile radio
receivers. In this application it is used to recover the in-
phase and quadrature baseband signals from the ampli-
fied and filtered IF. The RF2721 is intended for IF sys-
tems where the IF frequency ranges from 100kHz to
500MHz, and the LO frequency is two times the IF. The
IC contains all of the required components to implement
the demodulation function of the receiver and contains a
digital divider type 90° phase shifter, two double-balanced
mixers, and baseband amplifiers designed to interface
with analog to digital converters. The output DC offset
may be slaved to the reference of the ADCs to maintain
DC accuracy.
0.156
0.148
.018
.014
0.347
0.339
0.050
0.010
0.004
0.252
0.236
8° MAX
0° MIN
0.0500
0.0164
0.059
0.057
0.010
0.007
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
IF1+ 1
GND 2
OSCB 3
OSCE 4
GND 5
LO2- 6
LO2+ 7
QUAD
DIV.
BY 2
14 IF IN-
POWER
CONTROL
13 VCC
12 PD
11 GND
5 kΩ
5 kΩ
10 I OUT
9 REF IN
8 Q OUT
Package Style: SOIC-14
Features
• 5V Power Supply
• On-Chip Active Device for Oscillator
• ADC Compatible Outputs
• Low LO Power Requirement
• Digitally Controlled Power Down Mode
• 100kHz to 500MHz IF Operation
Ordering Information
RF2721
Quadrature Demodulator
RF2721 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
7
Rev A2 010509
2-27
1 page  
Preliminary
RF2721
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
J1
IF1
J2
LO IN
50 Ω µstrip
C1
100 nF
R1
51 Ω
C2
100 nF
R2
51 Ω
C3
100 nF
1
2
3
4
5
6
7
QUAD
DIV.
BY 2
14
POWER
CONTROL
13
12
11
5 kΩ
5 kΩ
10
9
8
2721400-
C4
100 nF
C6
100 nF
C7
100 nF
C5
100 nF
VCC
P1-1
P1
1 VCC
2 GND
P1-3 3 PD
PD
CON3
P2
P2-1
J3
I OUT
1 REF IN
2 GND
REF IN
3 NC
CON3
J4
Q OUT
7
Rev A2 010509
2-31
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet RF2721.PDF ] | |
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