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| May 1999 T NT DUC PRO LACEME 747 ETE REP -7 OL -442 OBS ENDED -800 com 1 M ons arris. COM icati O RE ral Appl tapp@h N n Cent : ce Call or email CA2111A FM IF Amplifier-Limiter and Quadrature Detector [ /Title (CA21 11A) /Subject (FM IF AmplifierLimiter and Quadra ture Detector) /Autho r () /Keywords (Harris Semiconductor, FM IF amplifier, quadrat ure detector, limiter, TV audio IF, high AM rejection, Features * Input Limiting Voltage At 10.7MHz . . . . . . . . . . . 400V * Input Limiting Voltage At 4.5, 5.5MHz . . . . . . . . 250V * Typical AM Rejection At 10.7MHz. . . . . . . . . . . . . 45dB * Provision for Output from 3-Stage IF Amplifier Section * Low Harmonic Distortion * Quadrature Detection Permits Simplified Single-Coil Tuning * Extremely Low AFC Voltage Drift Over Full Operating Temperature Range * Minimum Number of External Components Required Description The CA2111A provides a multistage wideband amplifierlimiter, a quadrature detector, and an emitter-follower output stage. This device is designed for use in FM receivers and in the sound IF sections of TV receivers. In addition, an output terminal is provided which allows the use of the amplifierlimiter as a straight 60dB wideband amplifier. The amplifier-limiter features the excellent limiting characteristic of 3 cascaded differential amplifiers. The quadrature detector requires only one coil in the associated outboard circuit and therefore, tuning is a simple procedure. A unique feature of the CA2111A is its exceptionally low AFC voltage drift over the full operating-temperature range. Part Number Information Applications * FM IF Sound * TV Sound IF PART NUMBER CA2111AE TEMP. RANGE (oC) -40 to 85 PACKAGE 14 Ld PDIP PKG. NO. E14.3 Pinout CA2111A (PDIP) TOP VIEW AUDIO OUT 1 REF BIAS 2 NC 3 IF IN 4 DC FB BYPASS 5 INPUT BYPASS 6 GROUND 7 14 DE-EMPHASIS 13 V+ 12 QUADRATURE INPUT 11 QUADRATURE IN BUF 10 HIGH IF OUTPUT 9 LOW IF OUTPUT 8 NC Block Diagram L1 V+ +12V 13 4 51 6 0.1F 0.1F 5 BIAS EMITTER FOLLOWER 1 3 AMPLIFIERLIMITER QUADRATURE DETECTOR 14H 3pF C1 9 12 120pF 2 10 11 14 8 0.003F 7 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright (c) Harris Corporation 1999 File Number 612.2 8-13 CA2111A Absolute Maximum Ratings TA = 25oC Thermal Information Thermal Resistance (Typical, Note 1) JA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Maximum Junction Temperature (Plastic Package) . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC Supply Voltage (V+ to V-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC Supply Voltage Range (Typical) . . . . . . . . . . . . . . . . . . . . 8V to 12V CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. JA is measured with the component mounted on an evaluation PC board in free air. Electrical Specifications PARAMETER Terminal 1 DC Voltage TA = 25oC Unless Otherwise Specified SYMBOL V1 V+ = 12V V+ = 8V TEST CONDITIONS MIN TYP 5.4 3.7 1.35 3.5 14 16 7 11 70 2.7 60 200 8.8 MAX UNITS V V V V mA mA k pF k pF k Terminals 4, 5, 6, 10 DC Voltage Terminals 2, 12 DC Voltage Supply Current, Pin 13 V4, 5, 6, 10 V2, 12 I13 V+ = 8V V+ = 8V V+ = 8V V+ = 12V Amplifier Input Resistance Amplifier Input Capacitance Detector Input Resistance Detector Input Capacitance Amplifier Output Resistance Detector Output Resistance De-emphasis Resistance R4 C4 R12 C12 R10 R1 R14 fO = 10.7MHz DYNAMIC CHARACTERISTICS fO = 10.7MHz, f = 75kHz, V+ = 8V, FM Modulation Frequency = 400Hz, Source Resistance = 50 Input Limiting Threshold Voltage AM Rejection Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion VI(LIM) AMR AV VO(AF) THD VI = 10mVRMS, 100% FM, 30% AM VI = 50VRMS VI = 10mVRMS VI = 10mVRMS 400 37 55 0.3 1 600 VRMS dB dB VRMS % DYNAMIC CHARACTERISTICS fO = 10.7MHz, f = 75kHz, V+ = 12V, FM Modulation Frequency = 400Hz, Source Resistance = 50 Input Limiting Threshold Voltage AM Rejection Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion VI(LIM) AMR AV VO(AF) THD VI = 10mVRMS, 100% FM, 30% AM VI = 50VRMS VI = 10mVRMS VI = 10mVRMS 400 45 55 0.48 1 600 VRMS dB dB VRMS % DYNAMIC CHARACTERISTICS fO = 4.5MHz, f = 25kHz, V+ = 12V, FM Modulation Frequency = 400Hz, Source Resistance = 50 Input Limiting Threshold Voltage AM Rejection VI(LIM) AMR VI = 10mVRMS, 100% FM, 30% AM 250 36 400 VRMS dB 8-14 CA2111A Electrical Specifications PARAMETER Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion TA = 25oC Unless Otherwise Specified (Continued) SYMBOL AV VO(AF) THD TEST CONDITIONS VI = 50VRMS VI = 10mVRMS VI = 10mVRMS MIN TYP 60 0.72 1.5 MAX UNITS dB VRMS % DYNAMIC CHARACTERISTICS fO = 5.5MHz, f = 50kHz, V+ = 12V, FM Modulation Frequency = 400Hz, Source Resistance = 50 Input Limiting Threshold Voltage AM Rejection Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion VI(LIM) AMR AV VO(AF) THD VI = 10mVRMS, 100% FM, 30% AM VI = 50VRMS VI = 10mVRMS VI = 10mVRMS 250 40 60 1.2 3 400 VRMS dB dB VRMS % Test Circuit V+ 13 0.1F 2 0.1F AM/FM SIGNAL GENERATOR 4 0.1F 51 1 6 14 0.1F 5 0.1F DISTORTION ANALYZER 3 7 8 C3 2k R1 9 10 50F AC VTVM L1 12 C1 C2 NOTE COMPONENT VALUES MHz 4.5 5.5 10.7 L1 H 14 8 2 C1 pF 120 100 120 R1 k 20 20 3.9 Q C2 pF 3 3 4.7 C3 F 0.003 0.003 0.01 DETECTOR TRANSFER CHARACTERISTICS UPPER PEAK MHz 4.58 5.63 10.9 LOWER PEAK MHz 4.42 5.37 10.5 30 30 20 NOTE: Input to the quadrature coil can be from either terminal 9 or terminal 10. Terminal 9 is normally used because it lessens the possibility of overloads during tuning. The use of terminal 10 increases the limiting sensitivity significantly and has been used successfully in these tests. 8-15 CA2111A Schematic Diagram 2 12 13 R19 8.8K R18 200 Q17 R16 Q9 Q7 Q8 R17 200 Q23 R2 4K R1 500 R6 2K R4 500 R7 2K R8 500 Q14 Q15 R10 450 R11 50 9 R13 2.5K Q22 R14 2.5K 11 Q24 Q27 R22 8K 1 200 Q18 Q19 Q20 Q21 R23 200 Q26 14 R12 3K Q10 Q11 R24 160K Q1 4 R3 1K Q3 Q2 Q4 6 5 Q5 R5 1K Q6 R9 1K Q12 Q13 Q16 R15 200 R20 200 R21 5K Q25 7 10 Typical Performance Curves 60 60 TA = 25oC V+ = 12V 100% FM, 30% AM fO = 4.5MHz REF. SIGNAL INPUT (TERM. 10) 50 AM REJECTION (dB) 50 AM REJECTION (dB) TA = 25oC V+ = 12V 100% FM, 30% AM fO = 5.5MHz REF. SIGNAL INPUT (TERM. 10) 40 40 REF. SIGNAL INPUT (TERM. 9) 30 30 REF. SIGNAL INPUT (TERM. 9) 20 20 10 0.1 10 1 10 0.1 1 INPUT VOLTAGE (Vi) (mVRMS) 10 INPUT SIGNAL VOLTAGE (Vi) (mVRMS) FIGURE 2. AM REJECTION vs INPUT VOLTAGE (AT 4.5MHz) FIGURE 3. AM REJECTION vs INPUT VOLTAGE (AT 5.5MHz) 8-16 CA2111A Typical Performance Curves 50 SUPPLY VOLTAGE 12V 40 AM REJECTION (dB) 8V 30 DETECTED AUDIO OUTPUT VOLTAGE (VO) (VRMS) 0.8 0.7 REF. SIGNAL INPUT (TERM. 9) 0.6 0.5 0.4 0.3 0.2 0.1 0 1 10 INPUT VOLTAGE (Vi) (mVRMS) 100 0.1 1 INPUT VOLTAGE (Vi) (mVRMS) 10 (Continued) 1.0 0.9 TA = 25oC, V+ = 12V fO = 4.5MHz f = 25kHz 20 10 TA = 25oC 100% FM, 30% AM fO = 5.5MHz 0 FIGURE 4. AM REJECTION vs INPUT VOLTAGE (AT 10.7MHz) FIGURE 5. DETECTED AUDIO OUTPUT vs INPUT VOLTAGE (4.5MHz) 1.3 1.2 DETECTED AUDIO OUTPUT VOLTAGE (VO) (VRMS) 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.1 1 10 TA = 25oC, V+ = 12V fO = 5.5MHz f = 50kHz REF. SIGNAL INPUT (TERM. 9) INPUT CARRIER = 1mV TA = 25oC fO = 10.7MHz f = 75kHz 100 SUPPLY VOLTAGE (V+) = 12V 8V DETECTED AUDIO OUTPUT VOLTAGE (VO) (VRMS) 10 0.01 0.1 1 10 100 INPUT VOLTAGE (Vi) (mVRMS) INPUT SIGNAL VOLTAGE (Vi) (mVRMS) FIGURE 6. DETECTED AUDIO OUTPUT vs INPUT VOLTAGE (AT 5.5MHz) FIGURE 7. DETECTED AUDIO OUTPUT VOLTAGE vs INPUT VOLTAGE (AT 10.7MHz) 3.8 80 SIGNAL-TO-NOISE RATIO (dB) AFC VOLTAGE, V1 (V) MODULATION FREQUENCY = 1kHz TA = 25oC f = 25kHz 60 SUPPLY VOLTAGE (V+) = 12V 3.7 40 8V 20 3.6 -50 -25 0 25 50 75 100 0 0.01 TEMPERATURE (oC) 0.1 1 INPUT VOLTAGE (Vi) (mVRMS) 10 FIGURE 8. AFC VOLTAGE vs AMBIENT TEMPERATURE FIGURE 9. SIGNAL-TO-NOISE RATIO vs INPUT VOLTAGE 8-17 |
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