XR2211 Exar Corporation, XR2211 Datasheet

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XR2211

Manufacturer Part Number
XR2211
Description
FSK Demodulator/ Tone Decoder
Manufacturer
Exar Corporation
Datasheet

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FEATURES
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
ORDERING INFORMATION
Wide Frequency Range, 0.01Hz to 300kHz
Wide Supply Voltage Range, 4.5V to 20V
HCMOS/TTL/Logic Compatibility
FSK Demodulation, with Carrier Detection
Wide Dynamic Range, 10mV to 3V rms
Adjustable Tracking Range, +1% to 80%
Excellent Temp. Stability, +50ppm/ C, max.
Rev. 3.01
1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
XR-2211ID
XR-2211M
XR-2211N
XR-2211P
Part No.
...the analog plus company
14 Lead SOIC (Jedec, 0.150”)
14 Pin CDIP (0.300”)
14 Pin CDIP (0.300”)
14 Pin PDIP (0.300”)
Package
1
TM
APPLICATIONS
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.
Caller Identification Delivery
FSK Demodulation
Data Synchronization
Tone Decoding
FM Detection
Carrier Detection
(510) 668-7000
Temperature Range
-55 C to +125 C
-40 C to +85 C
-40 C to +85 C
-40 C to +85 C
FAX (510) 668-7017
Operating
FSK Demodulator/
XR-2211
Tone Decoder
June 1997-3

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XR2211 Summary of contents

Page 1

... PLL for tracking an input signal within the pass band, a ORDERING INFORMATION Part No. XR-2211M XR-2211N XR-2211P XR-2211ID Rev. 3.01 1992 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 TM APPLICATIONS Caller Identification Delivery FSK Demodulation Data Synchronization Tone Decoding FM Detection Carrier Detection quadrature phase detector which provides carrier detection, and an FSK voltage comparator which provides FSK demodulation ...

Page 2

XR-2211 BLOCK DIAGRAM INP 2 TIM TIM C2 TIM REF 8 COMP I Rev. 3.01 V GND Pre Amplifier Loop -Det Lock Detect Comparator VCO Quad -Det Internal ...

Page 3

PIN CONFIGURATION INP 2 LDF 3 GND 4 LDOQN 5 LDOQ Lead CDIP, PDIP (0.300”) PIN DESCRIPTION Pin # Symbol Type Description 1 V Positive Power Supply INP I Receive Analog ...

Page 4

XR-2211 ELECTRICAL CHARACTERISTICS Test Conditions 12V + Parameter General Supply Voltage Supply Current Oscillator Section Frequency Accuracy Frequency Stability Temperature Power Supply Upper Frequency Limit Lowest Practical Operating Frequency Timing Resistor, R ...

Page 5

DC ELECTRICAL CHARACTERISTICS Test Conditions 12V + 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 ...

Page 6

XR-2211 PRINCIPLES OF OPERATION Signal Input (Pin 2): Signal is AC coupled to this terminal. The internal impedance at pin 2 is 20K . Recommended input signal level is in the range of 10mV rms to 3V rms. Quadrature Phase ...

Page 7

Input Preamp Î Î Î Î Î Î Î Î Î Figure 2. Functional Block Diagram of a Tone and FSK Decoding System Using XR-2211 ...

Page 8

XR-2211 DESIGN EQUATIONS (All resistance in , all frequency in Hz and all capacitance in farads, unless otherwise specified) (See Figure 3 for definition of components) 1. VCO Center Frequency · ...

Page 9

FSK Data filter time constant, tF: R · · seconds ) Loop phase detector conversion gain, Kd: (Kd is the differential DC voltage across pin ...

Page 10

XR-2211 APPLICATIONS INFORMATION FSK Decoding Figure 10 shows the basic circuit connection for FSK decoding. With reference to Figure 3 and Figure 10 , the functions of external components are defined as follows: R and C sets the loop filter ...

Page 11

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 ...

Page 12

XR-2211 Supply Voltage, V (Volts) Figure 5. Typical Supply Current vs. V+ (Logic Outputs Open Circuited) Î Î Î ...

Page 13

Design Example: 1200 Baud FSK demodulator with mark and space frequencies of 1200/2200. Step 1: Calculate f : from design instructions 1200·2200 =1624 O Step 2: Calculate =10K with a potentiometer of ...

Page 14

XR-2211 Loop Phase Detect 2 Input Signal 0.1 F Quad Phase Detect Figure 10. Circuit Connection for FSK Decoding of Caller Identification Signals 2 Input Signal 0.1 F Between 400K and 600K Figure 11. External Connectors for FSK Demodulation with ...

Page 15

Loop Phase Detect 2 0 Tone Input Quad Phase Detect Figure 12. Circuit Connection for Tone Detection FSK Decoding with Carrier Detect The lock detect section of XR-2211 can be used as a carrier detect option for FSK ...

Page 16

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 and C . For a given input, the ...

Page 17

Calculate R to set the bandwidth + f (See design equation 5 · f ·2 20, 000·1, 000· 100 Note: The total detection bandwidth covers the frequency range Calculate ...

Page 18

XR-2211 Linear FM Detection XR-2211 can be used as a linear FM detector for a wide range of analog communications applications. The recommended circuit connection for this application is shown in Figure 13. The demodulated output is taken from the ...

Page 19

LEAD CERAMIC DUAL-IN-LINE Base Plane Seating L Plane B SYMBOL Note: The control dimension is the inch column Rev. 3.01 (300 MIL ...

Page 20

XR-2211 14 LEAD PLASTIC DUAL-IN-LINE A Seating Plane L B SYMBOL Note: The control dimension is the inch column Rev. 3.01 ...

Page 21

LEAD SMALL OUTLINE (150 MIL JEDEC SOIC Seating Plane e SYMBOL Note: The control dimension is the millimeter column Rev. 3.01 Rev. 1. ...

Page 22

XR-2211 Rev. 3.01 Notes 22 ...

Page 23

Rev. 3.01 Notes 23 XR-2211 ...

Page 24

... While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ...

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