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MC13020 Dataheets PDF



Part Number MC13020
Manufacturers Motorola
Logo Motorola
Description AM STEREO DECODER
Datasheet MC13020 DatasheetMC13020 Datasheet (PDF)

Order this document by MC13020/D MC13020 Motorola C-QUAM® AM Stereo Decoder This circuit is a complete one ship, full feature AM stereo decoding and pilot detection system. It employs full–wave envelope signal detection at all times for the L + R signal, and decodes L – R signals only in the presence of valid stereo transmission. • No Adjustments, No Coils • Few Peripheral Components • True Full–Wave Envelope Detection for L + R • PLL Detection for L – R • 25 Hz Pilot Presence Required to Rece.

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Order this document by MC13020/D MC13020 Motorola C-QUAM® AM Stereo Decoder This circuit is a complete one ship, full feature AM stereo decoding and pilot detection system. It employs full–wave envelope signal detection at all times for the L + R signal, and decodes L – R signals only in the presence of valid stereo transmission. • No Adjustments, No Coils • Few Peripheral Components • True Full–Wave Envelope Detection for L + R • PLL Detection for L – R • 25 Hz Pilot Presence Required to Receive L – R • Pilot Acquisition Time 300 ms for Strong Signals, Time Extended for Noise Conditions to Prevent “Falsing” • Internal Level Detector can be used as AGC Source MOTOROLA C–QUAM® AM STEREO DECODER SEMICONDUCTOR TECHNICAL DATA 20 1 P SUFFIX PLASTIC PACKAGE CASE 738 ORDERING INFORMATION Device Operating Temperature Range Package MC13020P TA = – 40 to +85°C Plastic DIP +8.0Vdc Figure 1. Simplified Application 0.0033 0.0033 0.0033 220 IF Input Optional Tuner AGC Source 0.01 + 10µF 0.001 1 l Detector 2 Envelope Detector 3 IF Input 4 Level Detector 5 Error Amplifier 6 VCC Q Detector Phase Detector Osc. Feedback Osc. Input Ground Stereo Lamp Pilot Detector Input 20 19 18 17 51pF 16 47µF + 430 3.3k 0.01 15 14 + 0.47 0.0033 Audio Outputs Auto Monaural 7 Left Output 8 Right Output 100k 9 Forced Monaural Pilot Filter Input Co–Channel Input 220k 13 + 4.7k 56k 0.47 910 12 1.5k + 1.5k 10µF + 2.2µF 10 Lock + 2.2µF AGC’d Q 11 Output 430 + 4.7µF *muRata Ceramic Resonator – CSA3.60MGF101 LED Stereo Indicator The purchase of the Motorola C–QUAM® AM Stereo Decoder does not carry with such purchase any license by implication, estoppel or otherwise, under any patent rights of Motorola or others covering any combination of this decoder with other elements including use in a radio receiver. Upon application by an interested party, licenses are available from Motorola on its patents applicable to AM Stereo radio receivers. MOTOROLA ANALOG IC DEVICE DATA © Motorola, Inc. 1995 1 MC13020 MAXIMUM RATINGS Rating Supply Voltage Pilot Lamp Current, Pin 15 Operating Temperature Storage Temperature Junction Temperature Power Dissipation Derate above 25°C Symbol VCC TA Tstg TJ(max) PD Value 14 50 –40 to +85 –65 to +150 150 1.25 10 Unit Vdc mAdc °C °C °C W mW/°C ELECTRICAL CHARACTERISTICS (VCC = 8.0 Vdc, TA = 25°C, Input Signal = 200 mVrms. Unmodulated carrier, circuit of Figure 1, unless otherwise noted.) Characteristics Min Typ Max Unit Supply Line Current Drain, Pin 6 20 30 40 mAdc Input Signal Level, Unmodulated, Pin 3, for Full Operation 112 200 357 mVrms Audio Output Level, 50% Modulation L only or R only 160 220 280 mVrms Monaural 80 110 140 Channel Balance, 50% Modulation, Monaural – – ±1.0 dB Output THD, 50% Modulation Output THD, 90% Modulation Monaural Stereo Monaural – – – – 0.5 – 1.0 – 1.0 % Channel Separation, L only or R only, 50% Modulation 23 30 – dB Input Impedance Output Impedance Rin 20 Cin – – 27 – 6.0 – 100 150 kΩ pF Ω Pilot Acquisition Time VCO locked (after release of forced monaural) Bad Signal Condition – 280 300 1.48 – – ms sec Lock Detector Filter Voltage, Pin 10 In Lock 7.7 8.0 – Out of Lock – 0.8 1.0 Vdc Force to Monaural, Pin 9 Pull–Down for Monaural Mode 2.0 2.5 – – 0.15 1.0 Vdc µA Pull–Up for Automatic Mode – 3.5 3.7 – <0.001 1.0 Vdc µA Figure 2. Basic Quadrature AM (QUAM) 1+L+R Average Carrier θ (1+L+R)2 + (L–R)2 = Envelope Envelope amplitude is not a correct sum signal for envelope detection. L–R Figure 3. Motorola C–QUAM® (1+L+R)cosθ 1+L+R Average θ Carrier Envelope is compatible with existing monaural receivers. (L–R)cosθ 2 MOTOROLA ANALOG IC DEVICE DATA MC13020 Figure 4. Representative Block Diagram VCC 10µF 2.2µF 0.0033 0.0033 0.001 0.0033 ++ 62 15 20 4 10 Optional AGC To Tuner 0.01 IF Input 3 Env 1+L+R DET 1/cosθ Var Gain Phase DET VCO 19 18 + C1 Crystal 17 See Text and Figures R2 C2 5, 6 and 7 Rd CS 0.01 Error Amp Level DET Matrix IDET 0° 90° Divide by 8 16 1+L+R Lock Q L–R DET Pilot Decode Switch Q AGC ++ 400 – – 2.0k 47k 14 11 13 220k 56k 12 430 0.47 + 4.7k + 0.47 1.5k 7 L Audio 8 R Outputs (Note 1) VCC 220 LED Stereo 15 Indicator 9 Force to Monaural + 1.5k + 4.7µF 2.2µF + 10µF 910 NOTE 1. Output polarity is defined for receiver front end with LO above signal frequency. MOTOROLA C–QUAM® – COMPATIBLE QUADRATURE AM STEREO Introduction In C–QUAM®, conventional quadrature amplitude modulation has been modified by multiplying each axis by cosθ as shown in Figures 2 and 3. The resulting carrier envelope is 1 + L + R, i.e., a correct sum signal for monaural receivers and for stereo receivers operating in monaural mode. A 25 Hz pilot signal is added to the L – R information at a 4% modulation level. 90° relative demodulation angles by reference signals from the phase–locked, divided–down VCO. The output of the I DET is 1 + L + R, with the added benefit.


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