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零件编号 | XR-2211 | ||
描述 | FSK Demodulator/ Tone Decoder | ||
制造商 | Exar Corporation | ||
LOGO | |||
1 Page
...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
XR-2211
DESIGN EQUATIONS
(All resistance in W, all frequency in Hz and all capacitance in farads, unless otherwise specified)
(See Figure 3 for definition of components)
1. VCO Center Frequency, fO:
fO
+
1
R0·C0
2. Internal Reference Voltage, VREF (measured at pin 10):
ǒ ǓVREF +
VCC
2
–650mV in volts
3. Loop Low-Pass Filter Time Constant, t:
t + C1·RPP (seconds)
where:
ǒ ǓRPP +
R1·RF
R1 ) RF
if RF is 1 or CF reactance is 1, then RPP = R1
4. Loop Damping, j:
Ǹǒ Ǔz +
1250·C0
R1·C1
Note: For derivation/explanation of this equation, please see TAN-011.
5. Loop-tracking
bandwidth,
"+
Df
f0
Df
f0
+
R0
R1
Tracking
Bandwidth
Df Df
fLL f1
fO f2 fLH
Rev. 3.01
8
XR-2211
Design Instructions:
The circuit of Figure 12 can be optimized for any tone detection application by the choice of the 5 key circuit components:
R0, R1, C0, C1 and CD. For a given input, the tone frequency, fS, these parameters are calculated as follows:
(All resistance in W’s, all frequency in Hz and all capacitance in farads, unless otherwise specified)
a) Choose value of timing resistor R0 to be in the range of 10KW to 50KW. This choice is dictated by the max./min.
current that the internal voltage reference can deliver. The recommended value is R0 = 20KW. The final value of R0
is normally fine-tuned with the series potentiometer, RX.
b) Calculate value of C0 from design equation (1) or from Figure 7 fS = fO:
CO
+
1
R0·fs
c) Calculate R1 to set the bandwidth +Df (See design equation 5):
R1
+
R0·f0·2
Df
Note: The total detection bandwidth covers the frequency range of fO +Df
d) Calculate value of C1 for a given loop damping factor:
Normally, j = 0.5 is recommended.
C1
+
1250·C0
R1·j2
Increasing C1 improves the out-of-band signal rejection, but increases the PLL capture time.
e) Calculate value of the filter capacitor CD . To avoid chatter at the logic output, with RD = 470KW, CD must be:
CD
§
16
Df
C in mF
Increasing CD slows down the logic output response time.
Design Examples:
Tone detector with a detection band of + 100Hz:
a) Choose value of timing resistor R0 to be in the range of 10KW to 50KW. This choice is dictated by the max./min.
current that the internal voltage reference can deliver. The recommended value is R0 = 20 KW. The final value of R0
is normally fine-tuned with the series potentiometer, RX.
b) Calculate value of C0 from design equation (1) or from Figure 6 fS = fO:
C0
+
1
R0·fS
+
20,
1
000·1,
000
+
50nF
Rev. 3.01
16
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页数 | 24 页 | ||
下载 | [ XR-2211.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
XR-2211 | FSK Demodulator/ Tone Decoder | Exar Corporation |
XR-2211A | FSK Demodulator/ Tone Decoder | Exar Corporation |
XR-2211ACD | FSK Demodulator/ Tone Decoder | Exar Corporation |
XR-2211ACP | FSK Demodulator/ Tone Decoder | Exar Corporation |
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