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PDF XR-2211 Data sheet ( Hoja de datos )
| Número de pieza | XR-2211 | |
| Descripción | FSK Demodulator/ Tone Decoder | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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...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
1
1 page  
XR-2211
DC ELECTRICAL CHARACTERISTICS (CONT’D)
Test Conditions: VCC = 12V, TA = +25°C, RO = 30KW, CO = 0.033mF, unless otherwise specified.
Parameter
Voltage Comparator Section
Input Impedance
Input Bias Current
Voltage Gain
Output Voltage Low
Output Leakage Current
Internal Reference
Voltage Level
Output Impedance
Maximum Source Current
Min.
55
4.9
Typ.
2
100
70
300
0.01
5.3
100
80
Max.
500
10
5.7
Unit Conditions
MW Measured at Pins 3 and 8
nA
dB RL = 5.1KW
mV IC = 3mA
mA VO = 20V
V Measured at Pin 10
W AC Small Signal
mA
Notes
Parameters are guaranteed over the recommended operating conditions, but are not 100% tested in production.
Bold face parameters are covered by production test and guaranteed over operating temperature range.
Specifications are subject to change without notice
ABSOLUTE MAXIMUM RATINGS
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Input Signal Level . . . . . . . . . . . . . . . . . . . . . . . . 3V rms
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . 900mW
Package Power Dissipation Ratings
CDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW
Derate Above TA = 25°C . . . . . . . . . . . . . . . 8mW/°C
PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW
Derate Above TA = 25°C . . . . . . . . . . . . . . 60mW/°C
SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390mW
Derate Above TA = 25°C . . . . . . . . . . . . . . . 5mW/°C
SYSTEM DESCRIPTION
The main PLL within the XR-2211 is constructed from an
input preamplifier, analog multiplier used as a phase
detector and a precision voltage controlled oscillator
(VCO). The preamplifier is used as a limiter such that
input signals above typically 10mV rms are amplified to a
constant high level signal. The multiplying-type phase
detector acts as a digital exclusive or gate. Its output
(unfiltered) produces sum and difference frequencies of
the input and the VCO output. The VCO is actually a
current controlled oscillator with its normal input current
(fO) set by a resistor (R0) to ground and its driving current
with a resistor (R1) from the phase detector.
The output of the phase detector produces sum and
difference of the input and the VCO frequencies
(internally connected). When in lock, these frequencies
are fIN+ fVCO (2 times fIN when in lock) and fIN - fVCO (0Hz
when lock). By adding a capacitor to the phase detector
output, the 2 times fIN component is reduced, leaving a
DC voltage that represents the phase difference between
the two frequencies. This closes the loop and allows the
VCO to track the input frequency.
The FSK comparator is used to determine if the VCO is
driven above or below the center frequency (FSK
comparator). This will produce both active high and
active low outputs to indicate when the main PLL is in lock
(quadrature phase detector and lock detector
comparator).
Rev. 3.01
5
5 Page 
XR-2211
f) The input to the XR-2211 may sometimes be too sensitive to noise conditions on the input line. Figure 4 illustrates
a method of de-sensitizing the XR-2211 from such noisy line conditions by the use of a resistor, Rx, connected
from pin 2 to ground. The value of Rx is chosen by the equation and the desired minimum signal threshold level.
ǒ ǓVIN
minimum
(peak) +
Va–Vb + DV " 2.8mV
offset
+
VREF
20, 000
(20, 000 )
RX)
or
RX + 20, 000
VREF
DV
–1
VIN minimum (peak) input voltage must exceed this value to be detected (equivalent to adjusting V threshold)
VCC
ÎÎInput
Va
2
Rx 20K
ÎÎÎÎVREF 10
To Phase
Detector
Vb
20K
Figure 4. Desensitizing Input Stage
g) Calculate Data Filter Capacitance, CF:
Rsum
+
(RF ) R1)·RB
(R1 ) RF ) RB)
CF
+
0.25
(Rsum·Baud
Rate)
Baud
rate
in
1
seconds
Note: All values except R0 can be rounded to nearest standard value.
Rev. 3.01
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet XR-2211.PDF ] | |
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