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RF2713 Schematic ( PDF Datasheet ) - RF Micro Devices

Teilenummer RF2713
Beschreibung QUADRATURE MODULATOR/DEMODULATOR
Hersteller RF Micro Devices
Logo RF Micro Devices Logo 




Gesamt 12 Seiten
RF2713 Datasheet, Funktion
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






RF2713 Datasheet, Funktion
RF2713
Preliminary
Pin
1
Function
I INPUT A
Description (Modulator Configuration)
When the RF2713 is configured as a Quadrature Modulator, each
mixer is driven by an independent baseband modulation channel (I and
Q). The mixers can be driven single-endedly (as shown in the modula-
tor application circuit) or differentially. When driving single-endedly, the
B Inputs (pins 2 and 4) should be connected to each other. This
ensures that the baseband signals will reach each mixer with the same
DC reference, yielding the best carrier suppression. Note that the input
impedance changes according to the drive mode (see the mixer equiv-
alent circuit on the previous page). The single-ended input impedance
(as shown in the modulator application circuit) is 1200for each of the
two inputs. In the balanced configuration, the input impedance would
be 2400for each of the two inputs.
Interface Schematic
VCC
VCC
INPUT A
1260
1260
INPUT B
The mixers are Gilbert Cell designs with balanced inputs. The equiva-
lent schematic for one of the mixers is shown on the previous page.
The input impedance of each pin is determined by the 1200resistor
5 to VCC in parallel with a transistor base. Note from the schematic that
all four input pins have an internally set DC bias. For this reason, all
four inputs (pins 1 through 4) should be DC blocked. The capacitance
values of the blocking capacitors is determined by the baseband fre-
quency. When driving single-endedly, both the series (pins 1 and 3) and
shunt (pins 2 and 4) blocking capacitors should be low impedances, rel-
ative to the input impedance.
DC bias voltages may be supplied to the inputs pins, if required, in
order to increase the amount of carrier suppression. For example, the
DC levels on the reference inputs (pins 2 and 4) may be offset from
each other by adding different resistor values to ground. These resis-
tors should be larger than 2k. Note from the mixer schematic that all
four input pins have an internally set DC bias. If DC bias is to be sup-
plied, the allowable ranges are limited. For 5V applications, the DC ref-
erence on both I pins or both Q pins must not go below 2.7VDC, and in
no case should the DC voltage on any of the four pins go below 2.0VDC
or above 5.5VDC. IF a DC reference is to be supplied, the source must
also be capable of sinking current. If optimizing carrier suppression fur-
ther is not a concern, it is recommended that all four inputs (pins 1
through 4) be DC blocked.
2 I INPUT B Same as pin 1, except complementary input.
See pin 1.
3 Q INPUT A Same as pin 1, except Q Buffer Amplifier.
See pin 1.
4 Q INPUT B Same as pin 3, except complementary input.
See pin 1.
5 BG OUT Band Gap voltage reference output. This voltage output is held con-
stant over variations in supply voltage and operating temperature and
may be used as a reference for other external circuitry. This pin should
not be loaded such that the sourced current exceeds 1mA. This pin
should be bypassed with a large (0.1µF) capacitor.
6 I IF OUT Connecting pins 6 and 7 to each other accomplishes the summing
function of the upconverted I and Q channels. In addition, because
these outputs are open collector type, they must be connected to VCC
in order to properly bias the Gilbert Cell mixers. Maximum gain and out-
put power occur when the load on these two pins is ~1200. In most
applications the impedance of the next stage will be lower and a reac-
tive impedance transforming match should be used if maximum gain
and output level are of concern. Biasing, DC blocking, and impedance
transformation can simultaneously be achieved with the shunt-L /
series-C topology shown in the Application Circuit. The inductance and
capacitance values are chosen to achieve a specific impedance trans-
forming ratio at a specific IF frequency. For applications where the gain
is not as critical, a 1200resistor may be added in parallel with a
choke inductor in place of the matching inductor. If neither gain nor out-
put level is critical, the inductor may be replaced with a resistor that
sets the desired source impedance to drive the next stage. If the next
stage is an "open" at DC, the blocking capacitor may be eliminated.
IF OUT
7-22
Rev A2 010129

6 Page









RF2713 pdf, datenblatt
RF2713
Preliminary
Evaluation Board Layout
Modulator Configuration (2713 PCBA-M)
Board Size 2.0” x 2.0”
Board Thickness 0.031”, Board Material FR-4
5
7-28
Rev A2 010129

12 Page





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