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PDF RF2713 Data sheet ( Hoja de datos )
| Número de pieza | RF2713 | |
| Descripción | QUADRATURE MODULATOR/DEMODULATOR | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Preliminary
RF2713
7 QUADRATURE MODULATOR/DEMODULATOR
Typical Applications
• Digital and Analog Receivers and
Transmitters
• High Data Rate Digital Communications
• Spread-Spectrum Communication Systems
• Interactive Cable Systems
• Portable Battery-Powered Equipment
Product Description
The RF2713 is a monolithic integrated quadrature modu-
lator/demodulator. The demodulator is used to recover
the I and Q baseband signals from the amplified and fil-
tered IF. Likewise, the inputs and outputs can be reconfig-
ured to modulate I/Q signals onto an RF carrier. The
RF2713 is intended for IF systems where the IF fre-
quency ranges from 100kHz to 250MHz, and the LO fre-
quency is two times the IF. The IC contains all of the
required components to implement the modulation/
demodulation function and contains a digital divider type
90° phase shifter, two double balanced mixers, and base-
band amplifiers designed to interface with Analog to Digi-
tal Converters. The unit operates from a single 3V to 6V
power supply.
0.157
0.150
0.018
0.014
0.008
0.004
0.337
0.334
0.050
0.244
0.229
8° MAX
0° MIN
0.034
0.016
0.068
0.053
0.009
0.007
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
I INPUT A 1
I INPUT B 2
Q INPUT A 3
Q INPUT B 4
BG OUT 5
I IF OUT 6
Q IF OUT 7
14 VCC
QUAD
DIV.
BY 2
13 LO INPUT
12 GND
11 GND
10 GND
9 I OUT
8 Q OUT
Functional Block Diagram
Package Style: SOIC-14
Features
• 3V to 6V Operation
• Modulation or Demodulation
• IF From 100kHz to 250MHz
• Baseband From DC to 50MHz
• Digital LO Quadrature Divider
• Low Power and Small Size
Ordering Information
RF2713
Quadrature Modulator/Demodulator
RF2713 PCBA-D Fully Assembled Evaluation Board (Demodulator)
RF2713 PCBA-M Fully Assembled Evaluation Board (Modulator)
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
5
Rev A2 010129
7-17
1 page  
Preliminary
RF2713
Pin
13
14
Function
LO INPUT
VCC
Description (Demodulator Configuration)
Interface Schematic
High impedance, single-ended modulator LO input. The LO applied to
this pin is frequency divided by a factor of 2 and becomes the "Carrier".
For direct demodulation, the Carrier is equal in frequency to the center
of the input IF spectrum (except in the case of SSB/SC). The input
impedance is determined by an internal 500Ω bias resistor to VCC. An
external blocking capacitor should be provided if the pin is connected to
a device with DC present. Matching the input impedance is typically
achieved by adding a 51Ω resistor to ground on the source side of the
AC coupling capacitor. For the LO input, maximum power transfer is not
critical. The internal LO switching circuits are controlled by the voltage,
not power, into the part. In cases where the LO source does not have
enough available voltage, a reactive match (voltage transformer) can
be used. The LO circuitry consists of a limiting amplifier followed by a
digital divider. The limiting amp ensures that the flip-flop type divider is
driven with a square wave over a wide range of input levels. Because
the flip-flop uses the rising and falling edges of the limiter output, the
quadrature accuracy of the Carrier supplied to the mixers is directly
related to the duty cycle, or equivalently to the even harmonic content,
of the input LO signal. In particular, care should be taken to ensure that
the 2xLO level input to this pin is at least 20dB below the LO level. Oth-
erwise, the LO input is not sensitive to the type of input wave form,
except for IF frequencies below ~2.5MHz, in which case the LO input
should be a square wave, in order to ensure proper triggering of the
flip-flops. IF frequencies below 100kHz are attainable if the LO is a
square wave and sufficiently large DC blocking capacitors are used.
VCC
LO IN
500 Ω
VCC
500 Ω
Voltage supply for the entire device. This pin should be well bypassed
at all frequencies (IF, LO, Carrier, Baseband) that are present in the
part.
5
Rev A2 010129
7-21
5 Page 
Preliminary
RF2713
Evaluation Board Layout
Demodulator Configuration (2713 PCBA-D)
Board Size 2.0” x 2.0”
Board Thickness 0.031”, Board Material FR-4
5
Rev A2 010129
7-27
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RF2713.PDF ] | |
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