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Document overview
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Technical content
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 V RMS ¥ 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 65-2211-01 f-Detector Loop Filter VCO f f FSK Input Preamp Data Filter FSK Data Output FSK Comparator Lock Detector Outputs Lock Detector Comparator Lock Detector Filter f-Detector RC2211 FSK Demodulator/Tone Decoder Rev. 1.0.1 This document was created with FrameMaker 4 0 4
RC2211 PRODUCT SPECIFICATION Loop Phase Detector Output (Pin 11) This terminal provides a high impedance output for the loop phase detector. The PLL loop Þlter is formed by R1 and C1 connected to pin 11 (see Figure 1). With no input signal, or with no phase error within the PLL, the DC level at pin 11 is very nearly equal to V R . The peak voltage swing available at the phase detector output is equal to V R 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, F is given by: where C is the timing capacitor across pins 13 and 14. For optimum temperature stability R must be in the range of 10 k W to 100 k W (see Typical Performance Characteristics). This terminal is a low impedance point, and is internally biased at a DC level equal to V R . The maximum timing cur- rent drawn from pin 12 must be limited to 3 mA for proper operation of the circuit. VCO Timing Capacitor (Pins 13 and 14) VCO frequency is inversely proportional to the external tim- ing capacitor, C , connected across these terminals. C must be non-polarized, and in the range of 200 pF to 10 m VCO Frequency Adjustment VCO can be Þne tuned by connecting a potentiometer, Rx, in series with R at pin 12 (see Figure 2). VCO Free-Running Frequency, F The RC2211 does not have a separate VCO output terminal. Instead, the VCO outputs are internally connected to the phase detector sections of the circuit. However, for set-up or adjustment purposes, the VCO freerunning frequency can be measured at pin 3 (with C D disconnected) with no input and with pin 2 shorted to pin 10. Design Equations See Figure 1 for DeÞnitions of Components. 1. VCO Center Frequency, F F0 Hz() 1 R0C0 F0 Hz() 1 R0C0 2. Internal Reference V oltage, V R (measured at pin 10) 3. Loop Lowpass Filter Time Constant, t t = R C 4. Loop Dampening, z 5. Loop Tracking Bandwidth, D F/F 6. FSK Data Filter Time Constant, t F t F = R F C F 7. Loop Phase Detector Conversion Gain, K f f is the differential DC voltage across pins 10 and 11, per unit of phase error at phase-detector input): 8. VCO Conversion Gain, K is the amount of change in VCO frequency per unit of DC voltage change at pin 11: 9. Total Loop Gain, K T K T (in radians per second per volt)= 2 p K f 10. Peak Phase Detector Current, I A VR +VS æö -650 mV= z æö 1 4---èø æö= 65-2211-03 Tracking Bandwidth Df Df FLL F1 F0 F2 FLH Df/FO = R0/R1 kf in volts per radian() 2Ð() VR() K0 in Hertz per volt() 1Ð C0R1VR C0R1 IA mA() VR
PRODUCT SPECIFICATION RC2211 Pin Assignments Absolute Maximum Ratings Thermal Characteristics Parameter Min Max Unit Supply Voltage -20 +20 V Input Signal Level 3 V RMS Storage Temperature Range -65 +150 °C Operating Temperature Range RM2211D -55 +125 °C RV2211N -25 +85 °C RC2211N -0 +70 °C Junction Temperature PDIP +125 °C CerDIP +175 °C Lead Soldering Temperature (60 sec.) +300 °C Max. PD TA<50°C PDIP 468 mW CerDIP 1042 mW Parameter 14 Lead Plastic DIP 14 Lead Ceramic DIP Therm. Res qJC — 6 0 °C/W Therm. Res. qJA 160°C/W 120 °C/W For TA > 50°C Derate at 6.5 mW/ °C 8.33 mW/ °C 65-2211-04 +VS Input Lock Detector Filter GND FSK Data Output Q Q Timing Capacitor Timing Capacitor Timing Resistor Loop f-Detector FSK Comparator Input Reference Bypass Reference Voltage Output
RC2211 PRODUCT SPECIFICATION
Electrical Characteristics
(Test Conditions +VS = +12V, TA +25°C, R0 = 30 kW, C0 = 0.033 mF . See Figure 1 for component designations.) Notes: 1. Guaranteed by design. 2. Individual applications may need special circuitry to function at <12V. 3. Sample tested. RV/RM2211 RC2211 Parameters Test Conditlons Min Typ Max Min Typ Max Units General Supply Voltage 2 4.5 20 4.5 20 V Supply Current R 0 ³ 10 kW 4.0 9.0 5.0 11 mA Oscillator Frequency Accuracy Deviation from f Frequency Stability1 Temperature Coefficient R 1 = ¥± 20 ±50 ±20 ppm/ °C Power Supply Rejection +V S = 12 ±1V +V S = 5 ±0.5V 0.05 0.2 0.5 0.2 0.05 %/V %/V Upper Frequency Limit R 0 = 8.2 kW, C0 = 400 pF 100 300 300 kHz Lowest Practical Operating Frequency1 R 0 = 2 MW, C0 = 50 mF 0.01 0.01 Hz Timing Resistor, R0 Operating Range 5.0 2000 5.0 2000 k W Recommended Range 15 100 15 100 k W Loop Phase Detector Peak Output Current Measured at pin 11 ±150 ±200 ±300 ±100 ±200 ±300 mA Output Offset Current ±1.0 ±2.0 mA Output Impedance 1.0 1.0 M W Quadrature Phase Detector Peak Output Current
3 Measured at pin 3 100 150 150 mA
Output Impedance 1.0 1.0 M W Maximum Swing 11 11 V P-P Input Preamp Input Impedance Measured at pin 2 20 20 k W Input Signal Voltage Required to Cause Limiting 2.0 10 2.0 mV RMS Voltage Comparator Input Impedance Measured at pins 3 & 8 2.0 2.0 M W Input Bias Current 100 100 nA Voltage Gain 1 R L = 5.1 kW 55 70 55 70 dB Output Voltage Low I C = 3mA 300 300 mV Output Leakage Current V 0 = 12V 0.01 0.01 mA Internal Reference Output Impedance 100 100 W
PRODUCT SPECIFICATION RC2211 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: R 0 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. Figure 2. Circuit Connectbn for FSK Decoding Table 1. Recommended Component Values
- Calculate PLL center frequency, F 0
- Choose a value of timing resistor R 0 to be in the range
normally Þnetuned with the series potentiometer, RX.
- Calculate value of C 0 from Design Equation No. 1 or
- Calculate R 1 to give a Df equal to the markspace
- Calculate C 1 to set loop damping. (See Design Equation
- Calculate Data Filter Capacitance, C F:
75 Baud FSK demodulator with mark space frequencies of
PRODUCT SPECIFICATION RC2211 Schematic Diagram 65-2211-14 +VS 20K Q17 Q18 Input (2) Reference Voltage Output Q47 Q48 R12 18K R11 18K From VCO B B Q81 Q82 Q83 Q84 Q79 Q80 Q88 D87 Lock Detector FilterQ86 Q85D86 Q83 Q84 Lock Detector Outputs (5) Q42 (6)Q38 Lock Detector ComparatorQuadature Phase DetectorInput Pramplifier and Limitter D56 D57 20K R18 2K Q97 Q109 D96 Q95 A C0 Timing Capacitor A D108 R19 B B Q103 D101 R37 Timing Resistor D89 Q92 (4) GND Voltage Controlled Oscillator (12) Q60 A A From VCO Q68 Q62 D111 D72 D73 Q65 Q64 Q71 Q74 Loop f-Detector Output (11) (8) Q23 Q20 Q25 Q27 (7) FSK Data Output D24 FSK Comparator Q68 D67 Loop Phase Detector Q61 Intenal Voltage Reference (3) D85 (14)(13) FSK Comparator Input (1)
RC2211 PRODUCT SPECIFICATION Notes:
PRODUCT SPECIFICATION RC2211 Notes:
RC2211 PRODUCT SPECIFICATION Notes:
PRODUCT SPECIFICATION RC2211 Mechanical Dimensions 14-Lead Ceramic DIP Package A — .200 — 5.08 Symbol Inches Min. Max. Min. Max. Millimeters Notes b1 .014 .023 .36 .58 .065 1.65b2 .045 1.14 c1 .008 .015 .20 .38 E .220 .310 5.59 7.87 e .100 BSC 2.54 BSC L .125 .200 3.18 5.08 .015 .060 .38 1.52 .005 — .13 — 5, 9 eA .300 BSC 7.62 BSC 7 Q 90¡ 105¡ 90¡ 105¡a D — .785 — 19.94 Notes: Index area: a notch or a pin one identification mark shall be located adjacent to pin one. The manufacturer's identification shall not be used as pin one identification mark. The minimum limit for dimension "b2" may be .023 (.58mm) for leads number 1, 7, 8 and 14 only. Dimension "Q" shall be measured from the seating plane to the base plane. This dimension allows for off-center lid, meniscus and glass overrun. The basic pin spacing is .100 (2.54mm) between centerlines. Each pin centerline shall be located within ±.010 (.25mm) of its exact longitudinal position relative to pins 1 and 14. Applies to all four corners (leads number 1, 7, 8, and 14). "eA" shall be measured at the center of the lead bends or at the centerline of the leads when "a" is 90¡. All leads – Increase maximum limit by .003 (.08mm) measured at the center of the flat, when lead finish applied. Twelve spaces. NOTE 1 D E 8 14 7 1 Q A e L eA a
RC2211 PRODUCT SPECIFICATION Mechanical Dimensions (continued) 14-Lead Plastic DIP Package D e B A L 8 14 E eB C A — .210 — 5.33 Symbol Inches Min. Max. Min. Max. Millimeters Notes A1 .015 — .38 — .022 .56B .014 .36 .195 4.95A2 .115 2.93 B1 .045 .070 1.14 1.78 D .725 .795 18.42 20.19 .300 .325 7.62 8.26E eB — .430 — 10.92 .115 .200 2.92 5.08 e .100 BSC 2.54 BSC L 14 14 5N .240 .280 6.10 7.11E1 C .008 .015 .20 .38 D1 .005 — .13 — Notes: Dimensioning and tolerancing per ANSI Y14.5M-1982. "D" and "E1" do not include mold flashing. Mold flash or protrusions shall not exceed .010 inch (0.25mm). Terminal numbers are shown for reference only. "C" dimension does not include solder finish thickness. Symbol "N" is the maximum number of terminals.
PRODUCT SPECIFICATION RC2211 12/95 0.0m Stock#DS20002211 Ó Raytheon Company 1995 The information contained in this data sheet has been carefully compiled; however, it shall not by implication or otherwise become part of the terms and conditions of any subsequent sale. RaytheonÕs liability shall be determined solely by its standard terms and conditions of sale. No representation as to application or use or that the circuits are either licensed or free from patent infringement is intended or implied. Raytheon reserves the right to change the circuitry and any other data at any time without notice and assumes no liability for errors. LIFE SUPPORT POLICY: RaytheonÕs products are not designed for use in life support applications, wherein a failure or malfunction of the component can reasonably be expected to result in personal injury. The user of Raytheon components in life support applications assumes all risk of such use and indemniÞes Raytheon Company against all damages Raytheon Electronics Semiconductor Division
350 Ellis Street
Ordering Information
Notes: /883B suffix denotes MIL-STD-883, Par 1.2.1 Compliant Devices N = 14-Lead Plastic DIP D = 14-Lead Ceramic DIP Part Number Package Operating Temperature Range RC2211N N 0 °C to +70°C RV2211N N -25 °C to +85°C RM2211D D -55 °C to +125°C RM2211D/883B D -55 °C to +125°C