May 1999 [ /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, CA2111A CT T ODU CEMEN 7 R P E A 74 T L 7 E OL REP 00-442OBS ENDED 8 1 m s.co MM ions ECO pplicat p@harri R O N ral A centap Cent : Call or email FM IF Amplifier-Limiter and Quadrature Detector Features Description • Input Limiting Voltage At 10.7MHz . . . . . . . . . . . 400µV 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. • Input Limiting Voltage At 4.5, 5.5MHz . . . . . . . . 250µV • 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 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 PART NUMBER • FM IF Sound TEMP. RANGE (oC) CA2111AE • TV Sound IF Pinout PKG. NO. PACKAGE -40 to 85 14 Ld PDIP E14.3 Block Diagram L1 CA2111A (PDIP) TOP VIEW 14µH V+ +12V 3pF C1 AUDIO OUT 1 REF BIAS 2 NC 3 IF IN 4 14 DE-EMPHASIS 13 V+ 4 12 QUADRATURE INPUT 10 HIGH IF OUTPUT INPUT BYPASS 6 9 LOW IF OUTPUT 3 12 2 QUADRATURE DETECTOR 6 0.1µF 9 AMPLIFIERLIMITER 51Ω 11 QUADRATURE IN BUF DC FB BYPASS 5 GROUND 7 13 120pF 0.1µF 5 EMITTER FOLLOWER BIAS 8 NC 10 11 14 8 1 7 0.003µF CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © Harris Corporation 1999 8-13 File Number 612.2 CA2111A Absolute Maximum Ratings TA = 25oC Thermal Information Supply Voltage (V+ to V-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC Supply Voltage Range (Typical) . . . . . . . . . . . . . . . . . . . . 8V to 12V Thermal Resistance (Typical, Note 1) θJA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Maximum Junction Temperature (Plastic Package) . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC 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. θJA is measured with the component mounted on an evaluation PC board in free air. Electrical Specifications PARAMETER Terminal 1 DC Voltage Terminals 4, 5, 6, 10 DC Voltage Terminals 2, 12 DC Voltage Supply Current, Pin 13 TA = 25oC Unless Otherwise Specified SYMBOL MIN TYP MAX UNITS V+ = 12V - 5.4 - V V+ = 8V - 3.7 - V V4, 5, 6, 10 V+ = 8V - 1.35 - V V2, 12 V+ = 8V - 3.5 - V I13 V+ = 8V - 14 - mA V+ = 12V - 16 - mA fO = 10.7MHz - 7 - kΩ V1 TEST CONDITIONS Amplifier Input Resistance R4 Amplifier Input Capacitance C4 - 11 - pF Detector Input Resistance R12 - 70 - kΩ Detector Input Capacitance C12 - 2.7 - pF Amplifier Output Resistance R10 - 60 - Ω Detector Output Resistance R1 - 200 - Ω De-emphasis Resistance R14 - 8.8 - kΩ DYNAMIC CHARACTERISTICS fO = 10.7MHz, ∆f = ±75kHz, V+ = 8V, FM Modulation Frequency = 400Hz, Source Resistance = 50Ω Input Limiting Threshold Voltage AM Rejection Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion - 400 600 µVRMS VI = 10mVRMS, 100% FM, 30% AM - 37 - dB AV VI = 50µVRMS - 55 - dB VO(AF) VI = 10mVRMS - 0.3 - VRMS THD VI = 10mVRMS - 1 - % VI(LIM) AMR DYNAMIC CHARACTERISTICS fO = 10.7MHz, ∆f = ±75kHz, V+ = 12V, FM Modulation Frequency = 400Hz, Source Resistance = 50Ω Input Limiting Threshold Voltage AM Rejection Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion - 400 600 µVRMS VI = 10mVRMS, 100% FM, 30% AM - 45 - dB AV VI = 50µVRMS - 55 - dB VO(AF) VI = 10mVRMS - 0.48 - VRMS THD VI = 10mVRMS - 1 - % VI(LIM) AMR DYNAMIC CHARACTERISTICS fO = 4.5MHz, ∆f = ±25kHz, V+ = 12V, FM Modulation Frequency = 400Hz, Source Resistance = 50Ω Input Limiting Threshold Voltage AM Rejection VI(LIM) AMR VI = 10mVRMS, 100% FM, 30% AM 8-14 - 250 400 µVRMS - 36 - dB CA2111A TA = 25oC Unless Otherwise Specified (Continued) Electrical Specifications PARAMETER SYMBOL Amplifier Voltage Gain Detector Recovered Audio Output TEST CONDITIONS MIN TYP MAX UNITS AV VI = 50µVRMS - 60 - dB VO(AF) VI = 10mVRMS - 0.72 - VRMS THD VI = 10mVRMS - 1.5 - % Total Harmonic Distortion DYNAMIC CHARACTERISTICS fO = 5.5MHz, ∆f = ±50kHz, V+ = 12V, FM Modulation Frequency = 400Hz, Source Resistance = 50Ω - 250 400 µVRMS VI = 10mVRMS, 100% FM, 30% AM - 40 - dB AV VI = 50µVRMS - 60 - dB VO(AF) VI = 10mVRMS - 1.2 - VRMS THD VI = 10mVRMS - 3 - % Input Limiting Threshold Voltage VI(LIM) AM Rejection AMR Amplifier Voltage Gain Detector Recovered Audio Output Total Harmonic Distortion Test Circuit C2 C1 V+ 13 2 0.1µF COMPONENT VALUES NOTE L1 0.1µF DETECTOR TRANSFER CHARACTERISTICS 12 R1 ƒ L1 C1 R1 Q C2 C3 UPPER PEAK LOWER PEAK MHz µH pF kΩ - pF µF MHz MHz 4.5 14 120 20 30 3 0.003 4.58 4.42 5.5 8 100 20 30 3 0.003 5.63 5.37 10.7 2 120 3.9 20 4.7 0.01 10.9 10.5 9 AM/FM SIGNAL GENERATOR 4 10 0.1µF 50µF 51Ω AC VTVM 1 6 14 0.1µF 5 7 3 2kΩ 8 C3 0.1µF DISTORTION ANALYZER 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 R12 3K Q10 R24 160K Q6 Q3 Q1 4 R9 1K Q2 R18 200 R16 Q13 200 Q9 R20 200 Q26 14 Q21 Q19 Q18 Q20 R17 Q4 200 1 R22 8K 6 Q23 5 R2 4K R1 500 R23 200 Q17 Q12 Q7 Q8 Q5 R19 8.8K R15 200 Q16 Q11 R5 1K R3 1K 13 12 R4 500 R6 2K Q14 R7 2K R8 500 7 Q15 R10 450 R13 2.5K Q25 11 9 10 Q24 R14 2.5K R11 50 R21 5K Q27 Q22 Typical Performance Curves AM REJECTION (dB) 50 60 TA = 25oC V+ = 12V 100% FM, 30% AM fO = 4.5MHz REF. SIGNAL INPUT (TERM. 10) 50 40 REF. SIGNAL INPUT (TERM. 9) 30 AM REJECTION (dB) 60 REF. SIGNAL INPUT (TERM. 10) 40 REF. SIGNAL INPUT (TERM. 9) 30 20 20 10 TA = 25oC V+ = 12V 100% FM, 30% AM fO = 5.5MHz 0.1 10 1 10 0.1 INPUT SIGNAL VOLTAGE (Vi) (mVRMS) 1 10 INPUT VOLTAGE (Vi) (mVRMS) FIGURE 3. AM REJECTION vs INPUT VOLTAGE (AT 5.5MHz) FIGURE 2. AM REJECTION vs INPUT VOLTAGE (AT 4.5MHz) 8-16 CA2111A Typical Performance Curves (Continued) 50 1.0 SUPPLY VOLTAGE TA = 25oC, V+ = 12V fO = 4.5MHz ∆ f = ±25kHz 0.9 DETECTED AUDIO OUTPUT VOLTAGE (VO) (VRMS) 12V AM REJECTION (dB) 40 8V 30 20 10 TA = 25oC 100% FM, 30% AM fO = 5.5MHz 0.8 0.7 REF. SIGNAL INPUT (TERM. 9) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 10 100 0.1 INPUT VOLTAGE (Vi) (mVRMS) 1 10 INPUT VOLTAGE (Vi) (mVRMS) FIGURE 4. AM REJECTION vs INPUT VOLTAGE (AT 10.7MHz) FIGURE 5. DETECTED AUDIO OUTPUT vs INPUT VOLTAGE (4.5MHz) 1.3 1.1 TA = 25oC, V+ = 12V fO = 5.5MHz ∆ f = ±50kHz DETECTED AUDIO OUTPUT VOLTAGE (VO) (VRMS) DETECTED AUDIO OUTPUT VOLTAGE (VO) (VRMS) 1.2 REF. SIGNAL INPUT (TERM. 9) 1 0.9 0.8 0.7 0.6 0.5 INPUT CARRIER = 1mV TA = 25oC fO = 10.7MHz ∆ f = ±75kHz 0.3 100 0.1 10 1 0.01 INPUT VOLTAGE (Vi) (mVRMS) SIGNAL-TO-NOISE RATIO (dB) 80 3.7 0 25 50 1 10 100 FIGURE 7. DETECTED AUDIO OUTPUT VOLTAGE vs INPUT VOLTAGE (AT 10.7MHz) 3.8 -25 0.1 INPUT SIGNAL VOLTAGE (Vi) (mVRMS) FIGURE 6. DETECTED AUDIO OUTPUT vs INPUT VOLTAGE (AT 5.5MHz) AFC VOLTAGE, V1 (V) 8V 10 0.4 3.6 -50 SUPPLY VOLTAGE (V+) = 12V 75 100 TEMPERATURE (oC) FIGURE 8. AFC VOLTAGE vs AMBIENT TEMPERATURE MODULATION FREQUENCY = 1kHz TA = 25oC ∆ f = ±25kHz 60 40 SUPPLY VOLTAGE (V+) = 12V 8V 20 0 0.01 0.1 1 INPUT VOLTAGE (Vi) (mVRMS) 10 FIGURE 9. SIGNAL-TO-NOISE RATIO vs INPUT VOLTAGE 8-17