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RC2211 Schematic ( PDF Datasheet ) - RAYTHEON DEVICE

Teilenummer RC2211
Beschreibung FSK Demodulator/Tone Decoder
Hersteller RAYTHEON DEVICE
Logo RAYTHEON DEVICE Logo 




Gesamt 16 Seiten
RC2211 Datasheet, Funktion
RC2211
FSK Demodulator/Tone Decoder
Electronics
Semiconductor Division
Features
¥ Wide frequency range Ð 0.01 Hz to 300 kHz
¥ Wide supply voltage range Ð 4.5V to 20V
¥ DTL/TTL/ECL logic compatibility
¥ FSK demodulation with carrier-detector
¥ Wide dynamic range Ð 2 mV to 3 VRMS
¥ Adjustable tracking range Ð ±1% to ±80%
¥ Excellent temperature stability Ð 20 ppm/°C typical
Applications
¥ FSK demodulation
¥ Data synchronization
¥ Tone decoding
¥ FM detection
¥ Carrier detection
Description
The RC2211 is a monolithic phase-locked loop (PLL)
system especially designed for data communications. It is
particularly well-suited for FSK modem applications, and
operates over a wide frequency range of 0.01 Hz to 300 kHz.
It can accommodate analog signals between 2 mV and 3V,
and can interface with conventional DTL, TTL and ECL
logic families. The circuit consists of a basic PLL for
tracking an input signal frequency within the passband, a
quadrature phase detector which provides carrier detection,
and an FSK voltage comparator which provides FSK
demodulation. External components are used to indepen-
dently set carrier frequency, bandwidth and output delay.
Block Diagram
FSK
Input
Preamp
f-Detector
Loop Filter
f
VCO
f
Data Filter
FSK
Comparator
FSK
Data
Output
f-Detector
Lock
Detector
Filter
Lock
Detector
Outputs
Lock
Detector
Comparator
65-2211-01
This document was created with FrameMaker 4 0 4
Rev. 1.0.1






RC2211 Datasheet, Funktion
PRODUCT SPECIFICATION
RC2211
Applications
FSK Decoding
Figure 2 shows the basic circuit connection for FSK decod-
ing. With reference to Figures 1 and 2, the functions of
external components are deÞned as follows: R0 and C0 set
the PLL center frequency, R1 sets the system bandwidth, and
C1 sets the loop Þlter time constant and the loop damping
factor. CF and RF form a one pole post-detection Þlter for the
FSK data output. The resistor RB (510 kW) from pin 7 to pin
8 introduces positive feedback across FSK comparator to
facilitate rapid transition between output logic states.
Recommended component values for some of the most
commonly used FSK bauds are given in Table 1.
+VS
0.1 µF
FSK
Input
0.1 µF
RL
+VS 5.1K
FSK Data
Output
C0
1 14
2 13
3 12
4 11
RC2211
0.1 µF
5 10
69
78
RF
RB 100K
510K
CF
VCO
Fine Tune
R0
R1
RX
5K
C1
65-2211-05
Figure 2. Circuit Connectbn for FSK Decoding
Table 1. Recommended Component Values
for Commonly Used FSK Bands
(see Circuit of Figure 2)
FSK Band
Component Values
300 Baud
F1 = 1070 Hz
F2 = 1270 Hz
300 Baud
F1 = 2025 Hz
F2 = 2225 Hz
1200 Baud
F1 = 1200 Hz
F2 = 2200 Hz
C0 = 0.039 mF, CF = 0.005 mF
C1 = 0.01 mF, R0 = 18 kW
R1 = 100 kW
C0 = 0.022 mF, CF = 0.005 mF
C1 = 0.0047 mF, R0 = 18 kW
R1 = 200 kW
C0 = 0.027 mF, CF = 0.0022 mF
C1 = 0.01 mF, R0 = 18 kW
R1 = 30 kW
Design Instructions
The circuit of Figure 2 can be tailored for any FSK decoding
application by the choice of Þve key circuit components: R0,
R1, C0, C1 and CF. For a given set of FSK mark and space
frequencies, F1 and F2, these parameters can be calculated as
follows:
1. Calculate PLL center frequency, F0
fF0 = F----1----+2-----F---2-
2. Choose a value of timing resistor R0 to be in the range
of 10 kW to 100 kW. This choice is arbitrary. The recom-
mended value is R0 = 20 kW. The Þnal value of R0 ios
normally Þnetuned with the series potentiometer, RX.
3. Calculate value of C0 from Design Equation No. 1 or
from Typical Performance Characteristics:
C0 = 1/R0F0
4. Calculate R1 to give a Df equal to the markspace
deviation:
R1 = R0 [F0/(F1 - F2)]
5. Calculate C1 to set loop damping. (See Design Equation
No. 4)
Normally, z » 1/2 is recommended
Then: C1 = C0/4 for z = 1/2
6. Calculate Data Filter Capacitance, CF:
For RF = 100 kW, RB = 510 kW, the recommended value
of CF is:
CF (in mF)
=
------------3------------
Baud Rate
Note: All calculated component values except RO can be
rounded off to the nearest standard value, and R0 can
be varied to fine-tune center frequency through a series
potentiometer, RX (see Figure 2).
Design Example
75 Baud FSK demodulator with mark space frequencies of
1110/1170 Hz:
Step 1: Calculate F0:
F0=(1110+1170)(1/2)= 1140Hz
Step 2: Choose R0 = 20 kW (18 kW Þxed resistor in series
with 5 kW potentiometer)
Step 3: Calculate C0 from VCO Frequency vs. Timing
Capacitor: C9 = 0.044mF
Step 4: Calculate R1: R1 = R0 (1140/60) = 380 kW
Step 5: Calculate C1: C1 = C0/4 = 0.011 mF
Note: All values except R0 can be rounded off to nearest
standard value.
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RC2211 pdf, datenblatt
PRODUCT SPECIFICATION
Notes:
RC2211
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