Silicore FM STEREO MULTIPLEX DECODER z GENERAL DESCRIPTION CD7343CS Out line Drawing The CD7343CS is a monolithic integrated circuit consisting of a phase locked loop FM stereo de modulator. It is designed for car stereo, cassette recorder and other equipment. FEATURES z Wide op erating supp ly voltage: Vcc=3.5V~12V z High pilot la mp ON se nsitivity (V L ( O N ) = 9 mV) z Built-in indicator lamp drive circuit z Low distortion THD=0.08% at Vi=200mV BLOCK DIAGRAM 4 2 1 Phase Detector AF Vcc 76kHz DC 1/2 1/2 FW Switch 1/2 19kHz<90 Lamp Trigger Buffer 19kHz<0 Stereo Decorder 8 Voltage Regulator 38kHz 7 9 6 5 3 PIN CONNECTION CD7343CS 1 2 3 4 5 6 7 8 9 INCOM FIL1 Vcc VCO GND DPY FIL2 OUTL OUTR SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC 1/5 Silicore CD7343CS MAXIMUM RATINGS Characteristics Symbol Value Unit Vcc 12 V La mp Voltage VLAMP 16 V Lamp Current (Con tinuous) ILAMP 20 mA PD 500 mW Operating Ambient Temp erature Range Topr -25~75 °C Storage Temp erature Range Tstg -55~150 °C Supply Voltage Power Diss ipation ELECTRICAL CHARACTERISTICS ( Unless otherwise specified Vcc=8V,Ta mb=25°C,f=1kHz) Characteristic Quiescent Circuit Current Maximu m Input Voltage Channel Separation Total Harmonic Distortion (mono) Total Harmonic Distortion (stereo) Symbol Test Condition Min. Typ. Max. ICCQ Vi=0 11 Vi(max) L+R=90%, P=10%,THD=1% Sep L+R=180mV,Vp=20 mV 36 mV 45 dB Vi=200mV 0.08 THD2 L+R=180mV,Vp=20 mV 0.08 Av Vi=200mV Channel Balance CB Vi=200mV La mp ON l evel V L ( O N ) Pilot only La mp OFF level V L ( O F F ) Pilot only La mp Hysteresis VHY Carrier Leakage CL L+R=180mV Vp=20mV -2.0 2 0.3 % % 0 2.0 dB 0 1.5 dB 9 15 mV 6 mV 3 mV 19kHz 34 dB 38kHz 42 dB SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC mA 900 THD1 Voltage Gain 18 Unit 2/5 Silicore CD7343CS TEST CIRCUIT 2.2uF Vcc=8V 1uF SW4 3.3K 9 4.7uF BPF 4.7uF 3.3K SW3 Hz V3 ~ Hz V2 ~ BPF: SW3 SW2 3.3K 0.015uF R7 0.015uF C2 220K 330K 8 7 LED 390 9.1K C4 6 4.7K 620 4 5 R2 3 1000pF 10uF SG V1 ~ 2 1.0uF 1 3.3uF IN SW1 C1 R11K CD7343CS 19kHz≤ 55dB 38kHz≤ 55dB L.P.F APPLICATION INFORMATION (refer to test circuit) External Components 1. Input coupling capacitor (C1) The reco mmended value is 10µF. If s maller values than 10 µF are used, lo w frequency separation will worsens, and if larg e values are used ,POP noise occurs strongly. 2. Low Pass Filter (C2, C1, R1) This is the low Pass filter for the PLL, which is determined the captu re range and THD at low frequency. 3. VCO network (C4, R2, R7) The VCO free running frequency is adjusted by connecting a frequency counter to monitor the 38kHz output of Pin6 . 4. Decoder Output (Pin8,9) These components provide Right and Left channel Output lo ad circuits . The reco mmended circuits as follows: 400mH 4.7uF 68nF Output LPF Pin 8,9 2.2K 1nF From 15nF 4.7uF 68nF 3.3K Pin 8,9 Output 3.3K From 19kHz<55dB 38kHz<55dB SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC 3/5 Silicore CD7343CS APPLICATION CIRCUIT CD7343CS 0.01uF 1uF 220K 560 9 4.7uF OUT（L） 4.7uF OUT（R） 0.01uF 8 7 3.3K 6 47K 9.1K 5 3.3K 4 1.0uF 1K 3.3uF 10uF 3 2 1000pF 1 IN 100uF Vcc CHARACTERISTICS CURVES SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC 4/5 Silicore CD7343CS SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC 5/5