Order this document by MC13022A/D C–QUAM ADVANCED MEDIUM VOLTAGE AM STEREO DECODER The MC13022A is designed for home and automotive AM stereo radio applications. The circuits and functions included in the design allow implementation of a full–featured C–QUAM AM stereo radio with relatively few, inexpensive external parts. It is available in either 28–lead DIP or EIAJ compatible wide–bodied 28–lead SOIC. Functionally, the MC13022A and MC13022 are very similar. The MC13022A has 10 dB more audio output and a CMOS compatible logic level output (Pin 15) for stop sense. The stop sense/AGC function has been internally connected to the output notch filter control. • Operation from 6.0 V to 10 V Supply with Current Drain of 20 mA Typ • • • • • • • • • SEMICONDUCTOR TECHNICAL DATA IF Amplifier with Two Speed AGC Post Detection Filters that Allow Automatic Adjustable Audio Bandwidth Control and Notch Filtering (9.0 or 10 kHz) Signal Quality Controlled Stereo Blend and Noise Reduction P SUFFIX PLASTIC PACKAGE CASE 710 28 1 Noise and Co–Channel Discriminating Stop–On–Station Signal Strength Indicator Output for Stop Sense and/or Meter Drive Signal Strength Controlled IF and Audio Bandwidth Noise Immune Pilot Detector Needs no Precision Filter Components DW SUFFIX PLASTIC PACKAGE CASE 751F (SO–28L) 28 MC13025 Complementary Electronically Tuned Radio Front End 1 CMOS Compatible Driver for Stop Sense C–QUAM is a registered trademark of Motorola, Inc. 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. Simplified Application 450 kHz Low–Level IF IF Amp AGC IF L Decoder R Left Audio Post Det Filter Right Audio I Blend, COSθ, Fast–Lock Conrol Q Pilot Detector Yes/No Level Signal Quality Detector PIN CONNECTIONS Env Det 1 28 I Det Decoder Input 2 27 L–R Det Ref 3 26 Q Out AGC 4 IF Input 5 25 VCC 24 Loop Filter SS 6 23 Blend Filtered Left Out 7 22 GND Left Notch In 8 21 Stereo Lamp Feedback 9 20 Osc Feedback Unfiltered Lout 10 19 Osc In Unfiltered Rout 11 18 Pilot Det In Feedback 12 17 I Pilot Right Notch In 13 Pilot Lamp 16 Q Pilot Filtered Right Out 14 15 CMOS SS Out (Top View) Signal Strength Control of Audio Filters CMOS (Logic) Fast AGC Control ORDERING INFORMATION Device MC13022AP MC13022ADW This document contains information on a new product. Specifications and information herein are subject to change without notice. MOTOROLA ANALOG IC DEVICE DATA Operating Temperature Range Package Plastic Power TA = – 40° to +85°C Motorola, Inc. 1996 SO–28L Rev 1 1 MC13022A MAXIMUM RATINGS Rating Power Supply Input Voltage Symbol Value Unit VCC 12 Vdc – 30 mAdc TA –40 to +85 °C Tstg –65 to +150 °C TJ(max) 150 °C PD 1.25 10 W mW/°C Stereo Indicator Lamp Current (Pin 21) Operating Ambient Temperature Storage Temperature Range Operating Junction Temperature Power Dissipation Derate above 25°C NOTE: ESD data available upon request. ELECTRICAL CHARACTERISTICS (VCC = 8.0 V, TA = 25°C, Test Circuit of Figure NO TAG, unless otherwise noted.) Characteristic Min Typ Max Unit Power Supply Operating Range 6.0 8.0 10 Vdc Supply Line Current Drain (Pin 25) 10 20 25 mAdc Minimum Input Signal Level, Unmodulated for Full Operation (Pin 5) – 5.0 – mVrms Audio Output Level, 50% Modulation, L only or R only (Pins 10, 11) Stereo 290 400 530 mVrms Audio Output Level, 50% Modulation (Pins 10, 11) Monaural 140 200 265 mVrms – – 0.3 0.5 0.8 1.6 Channel Separation, L only or R only, 50% Modulation Stereo 22 35 – dB Pilot Acquisition Time Following Blend Reset to 0.3 Vdc – – 600 ms Audio Output Impedance at 1.0 kHz (Pins 7, 14) – 300 – Ω Stereo Indicator Lamp Pin Saturation Voltage at 3.0 mA Load Current (Vsat Pin 21) – – 200 mVdc Stereo Indicator Lamp Pin Leakage Current (Pin 21) – – 1.0 µAdc Oscillator Capture Range – ±3.0 – kHz 2 MOTOROLA ANALOG IC DEVICE DATA Output THD, 50% Modulation Monaural Stereo % MC13022A Figure 1. Test Circuit From Tuning System Logic VCC (5.0 V) VCC 3.0 k 2.2 k 3.9 k 0.001 0.001 T1 0.001 47 µF IDet 28 L–R Det 27 Q Out 26 20 µF + Loop Filt 24 VCC 25 47 k .001 To CMOS Logic 51 10 µF LED + Blend Gnd 23 22 Stereo Lamp 21 + 0.68 0.33 Osc Fbk 20 Osc In 19 Pilot Det Input 18 Pilot I 17 Signal Quality Detector + 0.47 Stop Sense Pilot Q 16 15 Pilot Detector VCO Decoder Gain–Controlled L–R Q2 Envelope L+R IF Out Signal Strength Output IF/AGC Matrix 1.0 k Q1 1.7 Vref Filter Amp Buffer Filter Amp Buffer 3.0 V 1 Env Det 0.001 2 Decoder Input 3 Ref 13 k 4 AGC 5 6 + 7 0.01 10 µF 8 9 43 k 10 k L2 10 740 11 12 740 43 k + 10 µF Filtered Left Output 100 k 370 370 L Output 0.01 43 k 21.5 k 21.5 k 120 14 43 k IF Input 1.0 mH 13 370 370 Filtered Right Output R Output Stop Sense, SS Meter T1 – Ceramic Resonator muRata T1 – CSA 3.60 MGF103 L2 – Miller 9230–92 NOTES: 1. Q1 is switched on when the Blend Pin 23 is externally held low and the signal is weak or has 110% negative modulation. In this condition Q1 pulls Pin 6 low (0.25 to 1.3 V). At all other times, Pin 6 follows the curve in Figure NO TAG. 2. Q2 (Pin 15) is switched on when Pin 6 voltage is below 1.7 V. Q2 could then be used as a logic output to the tuning system, telling the tuning system to continue searching for a good signal. 3. User is cautioned not to require more than 1.0 mA from Pin 6. MOTOROLA ANALOG IC DEVICE DATA 3 MC13022A EXPLANATION OF FEATURES Blend and Noise Reduction Although AM stereo does not have the extreme difference in S/N between mono and stereo that FM does (typically less than 3.0 dB versus greater than 20 dB for FM), sudden switching between mono and stereo is quite apparent. Some forms of interference such as co–channel have a large L–R component that makes them more annoying than would ordinarily be expected for the measured level. The MC13022A measures the interference level and reduces L–R as interference increases, blending smoothly to monaural. The pilot indicator remains on as long as a pilot signal is detected, even when interference is severe, to minimize annoying pilot light flickering. Signal Strength A dc voltage proportional to the log of signal strength is provided at Pin 6. This can be used for signal strength indication, and it directly controls the post detection filter. Normal operation is above 2.2 V as shown is Figure NO TAG. Stop Sense The signal strength information is multiplexed with the stop sense signal. The stop sense is activated when scanning by externally pulling the blend, Pin 23, below 0.3 V. This would typically be done from the mute line in a frequency synthesizer. If at any time Pin 23 is low and there is either no signal in the IF or a noisy signal of a predetermined interference level, Pins 6 and 15 will go low. This low can be used to tell 4 the frequency synthesizer to immediately scan to the next channel. The interference detection prevents stopping on many unlistenable stations, a feature particularly useful at night when many frequencies may have strong signals from multiple co–channel stations. Pin 6 drives a comparator which has a 1.7 V reference. Therefore the comparator output, Pin 15, is low if Pin 6 is <1.7 V and high if Pin 6 is >1.7 V. IF Bandwidth Control IF AGC attenuates the signal by shunting the signal at the IF input. This widens the IF bandwidth by decreasing the loaded Q of the input coupling coil as signal strength increases. Post Detection Filtering With weak, noisy signals, high frequency rolloff greatly improves the sound. Conventional tone controls do not attenuate the highs sufficiently to control noise without also significantly affecting the mid–range. Also, notch filters are necessary with any wide–band AM radio to eliminate the 10 kHz whistle from adjacent stations. By using a twin–T filter with variable feedback to the normally grounded center leg, a variable Q notch filter is formed that provides both the 10 kHz notch and variable high frequency rolloff functions. Typical range of response is shown in Figure NO TAG. Response is controlled by Pin 6 for automatic audio bandwidth control as a function of signal strength. MOTOROLA ANALOG IC DEVICE DATA MC13022A Figure 2. High Performance Home Type AM Stereo Receiver From Mute Line Logic VCC (5.0 V) VCC TOKO Part No. MF292BC–1349Z .001 3.9 k T1 28 I Det 27 L–R Det 26 Q Out 25 VCC 24 Loop Filter 23 Blend 22 GND To Tuning System 51 21 20 Stereo Osc Lamp Feedbk 19 Osc In 18 Pilot Det In 17 I Pilot 16 Q Pilot 15 CMOS SS Out MC13022A Env Det 1 Decoder Input 2 Ref 3 IF Input 5 AGC 4 T2 Out 7 Left Notch FBK In 8 9 Unfiltered Lout Rout 10 11 FBK 12 Right Notch Out In 13 14 To Signal Strength Meter 450 kHz See MC13025 Data Sheet for Alternate Approach SS 6 IF TOKO Part No. THB–122 Loop Stick Tuning Line From Synthesizer Mixer T1 – Ceramic Resonator muRata T1 – CSA 3.60 MGF103 T2 – Broad Resonance @ 450 kHz T2 – Effective RP of 8.0 k to 12 k T2 – (TOKO 7NRES–T13704) Oscillator Figure 3. Overall Selectivity of a Typical Receiver versus Filter Control Voltage STOP SENSE, SS METER, PIN 6 (Vdc) Figure 4. Strength Output versus Input Signal OVERALL RESPONSE (dB) 0 –10 –20 –30 –40 –50 –60 –70 –80 VPin 6 = 3.5 Vdc 2.5 Vdc 1.5 Vdc – – Response at – – Pins 10 and 11 Due – – to IF Selectivity – – Total Response at – – Output Pins 7 and 14 Signal Input 5.0 5 2 3 10 k 0.01 6 100 k SS Meter 0.01 Zo = 13 k 4.0 3.0 2.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0 10 15 AUDIO FREQUENCY (kHz) MOTOROLA ANALOG IC DEVICE DATA 20 30 1.0 3.0 10 30 100 300 SIGNAL INPUT, 10 kΩ TO PIN 5 (mVrms) 1.0 k 5 MC13022A OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 710–02 ISSUE B 28 NOTES: 1. POSITIONAL TOLERANCE OF LEADS (D), SHALL BE WITHIN 0.25 (0.010) AT MAXIMUM MATERIAL CONDITION, IN RELATION TO SEATING PLANE AND EACH OTHER. 2. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 3. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 15 B DIM A B C D F G H J K L M N 14 1 L C A N H G F M K D J SEATING PLANE MILLIMETERS MIN MAX 36.45 37.21 13.72 14.22 3.94 5.08 0.36 0.56 1.02 1.52 2.54 BSC 1.65 2.16 0.20 0.38 2.92 3.43 15.24 BSC 0_ 15_ 0.51 1.02 INCHES MIN MAX 1.435 1.465 0.540 0.560 0.155 0.200 0.014 0.022 0.040 0.060 0.100 BSC 0.065 0.085 0.008 0.015 0.115 0.135 0.600 BSC 0_ 15_ 0.020 0.040 DW SUFFIX PLASTIC PACKAGE CASE 751F–04 (SO–28L) ISSUE E NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. –A– 15 28 14X –B– 1 P 0.010 (0.25) M B M 14 28X D 0.010 (0.25) M T A S B M S R X 45 _ C 26X –T– G SEATING PLANE K F J 6 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 17.80 18.05 7.40 7.60 2.35 2.65 0.35 0.49 0.41 0.90 1.27 BSC 0.23 0.32 0.13 0.29 0_ 8_ 10.01 10.55 0.25 0.75 INCHES MIN MAX 0.701 0.711 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0_ 8_ 0.395 0.415 0.010 0.029 MOTOROLA ANALOG IC DEVICE DATA MC13022A Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. 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MOTOROLA ANALOG IC DEVICE DATA 7 MC13022A How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454 JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315 MFAX: [email protected] – TOUCHTONE 602–244–6609 INTERNET: http://Design–NET.com ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 8 ◊ MOTOROLA ANALOG IC DEVICE DATA *MC13022A/D* MC13022A/D