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XR-2211 Schematic ( PDF Datasheet ) - Exar Corporation

Teilenummer XR-2211
Beschreibung FSK Demodulator/ Tone Decoder
Hersteller Exar Corporation
Logo Exar Corporation Logo 




Gesamt 24 Seiten
XR-2211 Datasheet, Funktion
...the analog plus companyTM
XR-2211
FSK Demodulator/
Tone Decoder
FEATURES
D Wide Frequency Range, 0.01Hz to 300kHz
D Wide Supply Voltage Range, 4.5V to 20V
D HCMOS/TTL/Logic Compatibility
D FSK Demodulation, with Carrier Detection
D Wide Dynamic Range, 10mV to 3V rms
D Adjustable Tracking Range, +1% to 80%
D Excellent Temp. Stability, +50ppm/°C, max.
APPLICATIONS
D Caller Identification Delivery
D FSK Demodulation
D Data Synchronization
D Tone Decoding
D FM Detection
D Carrier Detection
June 1997-3
GENERAL DESCRIPTION
The XR-2211 is a monolithic phase-locked loop (PLL)
system especially designed for data communications
applications. It is particularly suited for FSK modem
applications. It operates over a wide supply voltage range
of 4.5 to 20V and a wide frequency range of 0.01Hz to
300kHz. It can accommodate analog signals between
10mV 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 within the pass band, a
quadrature phase detector which provides carrier
detection, and an FSK voltage comparator which provides
FSK demodulation. External components are used to
independently set center frequency, bandwidth, and output
delay. An internal voltage reference proportional to the
power supply is provided at an output pin.
The XR-2211 is available in 14 pin packages specified for
military and industrial temperature ranges.
ORDERING INFORMATION
Part No.
XR-2211M
XR-2211N
XR-2211P
XR-2211ID
Package
14 Pin CDIP (0.300”)
14 Pin CDIP (0.300”)
14 Pin PDIP (0.300”)
14 Lead SOIC (Jedec, 0.150”)
Operating
Temperature Range
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Rev. 3.01
E1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
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XR-2211 Datasheet, Funktion
XR-2211
PRINCIPLES OF OPERATION
Signal Input (Pin 2): Signal is AC coupled to this
terminal. The internal impedance at pin 2 is 20KW.
Recommended input signal level is in the range of 10mV
rms to 3V rms.
Quadrature Phase Detector Output (Pin 3): This is the
high impedance output of quadrature phase detector and
is internally connected to the input of lock detect voltage
comparator. In tone detection applications, pin 3 is
connected to ground through a parallel combination of RD
and CD (see Figure 3) to eliminate the chatter at lock
detect outputs. If the tone detect section is not used, pin 3
can be left open.
Lock Detect Output, Q (Pin 6): The output at pin 6 is at
“low” state when the PLL is out of lock and goes to “high”
state when the PLL is locked. It is an open collector type
output and requires a pull-up resistor, RL, to VCC for
proper operation. At “low” state, it can sink up to 5mA of
load current.
Lock Detect Complement, (Pin 5): The output at pin 5 is
the logic complement of the lock detect output at pin 6.
This output is also an open collector type stage which can
sink 5mA of load current at low or “on” state.
FSK Data Output (Pin 7): This output is an open collector
logic stage which requires a pull-up resistor, RL, to VCC for
proper operation. It can sink 5mA of load current. When
decoding FSK signals, FSK data output is at “high” or “off”
state for low input frequency, and at “low” or “on” state for
high input frequency. If no input signal is present, the logic
state at pin 7 is indeterminate.
FSK Comparator Input (Pin 8): This is the high
impedance input to the FSK voltage comparator.
Normally, an FSK post-detection or data filter is
connected between this terminal and the PLL phase
detector output (pin 11). This data filter is formed by RF
and CF (see Figure 3.) The threshold voltage of the
comparator is set by the internal reference voltage, VREF,
available at pin 10.
Reference Voltage, VREF (Pin 10): This pin is internally
biased at the reference voltage level, VREF: VREF = VCC /2
- 650mV. The DC voltage level at this pin forms an internal
reference for the voltage levels at pins 5, 8, 11 and 12. Pin
10 must be bypassed to ground with a 0.1mF capacitor for
proper operation of the circuit.
Loop Phase Detector Output (Pin 11): This terminal
provides a high impedance output for the loop phase
detector. The PLL loop filter is formed by R1 and C1
connected to pin 11 (see Figure 3.) With no input signal, or
with no phase error within the PLL, the DC level at pin 11 is
very nearly equal to VREF. The peak to peak voltage swing
available at the phase detector output is equal to 2 x VREF.
VCO Control Input (Pin 12): VCO free-running
frequency is determined by external timing resistor, R0,
connected from this terminal to ground. The VCO
free-running frequency, fO, is:
fO +
1
R0·C0
Hz
where C0 is the timing capacitor across pins 13 and 14.
For optimum temperature stability, R0 must be in the
range of 10KW to 100KW (see Figure 9.)
This terminal is a low impedance point, and is internally
biased at a DC level equal to VREF. The maximum timing
current drawn from pin 12 must be limited to < 3mA for
proper operation of the circuit.
VCO Timing Capacitor (Pins 13 and 14): VCO
frequency is inversely proportional to the external timing
capacitor, C0, connected across these terminals (see
Figure 6.) C0 must be non-polar, and in the range of
200pF to 10mF.
VCO Frequency Adjustment: VCO can be fine-tuned by
connecting a potentiometer, RX, in series with R0 at pin 12
(see Figure 10.)
VCO Free-Running Frequency, fO: XR-2211 does not
have a separate VCO output terminal. Instead, the VCO
outputs are internally connected to the phase detector
sections of the circuit. For set-up or adjustment purposes,
the VCO free-running frequency can be tuned by using
the generalized circuit in Figure 3, and applying an
alternating bit pattern of O’s and 1’s at the known mark
and space frequencies. By adjusting R0, the VCO can
then be tuned to obtain a 50% duty cycle on the FSK
output (pin 7). This will ensure that the VCO fO value is
accurately referenced to the mark and space frequencies.
Rev. 3.01
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6 Page









XR-2211 pdf, datenblatt
XR-2211
20
15
R0=5K
10
R0=10K
5
R0>100K
0
4 6 8 10 12 14 16 18 20 22 24
Supply Voltage, V+ (Volts)
1.0
0.1
0.01
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎRRRRRR000000ÎÎÎÎÎÎÎÎÎÎÎ======2514810K6000K0KKKÎÎÎÎÎÎÎÎÎÎÎWKWWWWWÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
100 1000 10000
fO(HZ)
Figure 5. Typical Supply Current vs. V+
1,10010ÎÎÎÎÎÎÎÎÎÎÎ000 ÎÎÎÎÎÎÎÎÎÎÎ(CCL00o==ÎÎÎÎÎÎÎÎÎÎÎ00g..13icmÎÎÎÎÎÎÎÎÎÎÎ3FmOFuÎÎÎÎÎÎÎÎÎÎÎtpÎÎÎÎÎÎÎÎÎÎÎutCsCCC0ÎÎÎÎÎÎÎÎÎÎÎ=000O===0.000p0...ÎÎÎÎÎÎÎÎÎÎÎe30003001nm113Fmm3CÎÎÎÎÎÎÎÎÎÎÎFFmiFrcÎÎÎÎÎÎÎÎÎÎÎuitÎÎÎÎÎÎÎÎÎÎÎed)ÎÎÎÎÎÎÎÎÎÎÎ
0
1000
10000
fO(Hz)
Figure 7. VCO Frequency vs. Timing Capacitor
Figure 6. VCO Frequency vs. Timing Resistor
1.02
1.01 5
4
1.00
3
0.99
2
0.98
1
0.97
46
fO = 1kHz
RF = 10R0
5
1
2
4
3
Curve R0
1 5K
2 10K
3 30K
4 100K
5 300K
8 10 12 14 16 18 20 22 24
V+ (Volts)
Figure 8. Typical fO vs. Power Supply
Characteristics
+1.0
R0=10K
1M
+0.5
0 R0=50K
R0=500K
500K
50K
10K
-0.5
R0=1M
-1.0
-50 -25
V+ = 12V
R1 = 10 R0
fO = 1 kHz
0 25 50 75
Temperature (°C)
100 125
Figure 9. Typical Center Frequency Drift vs. Temperature
Rev. 3.01
12

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