Ordering number: EN2619B Monolithic Linear IC LA3335M PLL FM Multiplex Demodulator for 3 V Headphone Stereos and Radio-cassette Recorders Overview Package Dimensions The LA3335M is PLL FM stereo multiplex demodulator IC designed for use in headphone stereos, etc. which operate from a low supply voltage. unit : mm 3086A-MFP10S [LA3335M] Applications . FM Multiplex IC for 3 V headphones, radio-cassette recorders Functions . PLL FM stereo decoder, VCO stop, stereo indicator Features . Wide operating voltage range : 1.8 to 6 V . Low current dissipation : 1.6 mA . Minimum number of external parts required SANYO : MFP10S Specifications Maximum Ratings at Ta = 25 °C Parameter Maximum supply voltage Symbol Conditions Ratings Unit VCC max 8 V Lamp drive current IL max 10 mA Allowable power dissipation Pd max 50 mW Ta % 70 °C Operating temperature Topr –20 to +70 °C Storage temperature Tstg –40 to +125 °C Ratings Unit Operating Conditions at Ta = 25 °C Parameter Recommended supply voltage Operating voltage range Input signal voltage Symbol VCC VCC op VIN Conditions 3 V 1.8 to 6 V 150 mV SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN O3096HA(II)/40594HK/O307TA,TS No.2619-1/6 LA3335M Operating Characteristics at Ta = 25 °C, VCC = 3 V, input 150 mV, L + R = 90%, pilot = 10%, f = 1 kHz, See specified Test Circuit. Parameter Quiescent current Input resistance Output resistance Channel separation Symbol ICCO Ri Ro CHsep Total harmonic distortion THD Output voltage Channel balance Lamp lighting level Lamp hysteresis Capture range Allowable input level Signal to noise ratio VO CB VL hy CR VIN max S/N Conditions min No input 35 5.3 30 Monaural Stereo main Monaural Monaural Pilot 90 1.5 Pilot 15 mV Monaural, THD = 5% Monaural typ 1.6 50 7.5 45 0.6 0.3 130 0 3.5 3.5 ±3 350 82 max 2.5 65 9.7 1.5 1.5 180 1.5 6 Unit mA kΩ kΩ dB % % mV dB mV dB % mV dB Equivalent Circuit Block Diagram and Test Circuit Decoder Sync detection Lamp trigger Stereo Switch Phase comparison S1: VCO STOP when ON AMP: Bandwidth of 100 kHz or more, THD = 0.01% or less, input impedance of 330 kΩ or more * Styrol capacitor No.2619-2/6 LA3335M External Parts Part Name Symbol Value Remarks R1 Carbon resistor 27 kΩ VCO time constant R2 Carbon resistor 560 Ω Limiting resistor VR1 Carbon resistor 10 kΩ VCO OSC frequency adjust C1 Electrolytic capacitor 2.2 µF DC blocking C2 Electrolytic capacitor 0.1 µF C3 Polystyrol capacitor 1000 pF C4 Electrolytic capacitor 1 µF Pilot detection C5 Ceramic capacitor 6800 pF De-emphasis C6 Ceramic capacitor 6800 pF De-emphasis C7 Electrolytic capacitor Resistor Semifixed resistor Kind Capacitor Loop filter VCO time constant Power supply ripple filter Typical Voltage and Name of Each Pin Pin No. Voltage Name 1 1.2 V 2 VCC–0.7 V PLL loop filter 3 VCC Power supply 4 — VCO 5 — NC 6 0V GND 7 — Stereo indicator 8 VCC–0.7 V 9 1.3 V Decoder output (low) 10 1.3 V Decoder output (high) Remarks Input VCC–0.2 V 0.65 VCC Open collector Pilot sync detection filter Proper cares in using IC 1. 2. VCO stop method Short pin 7 and pin 3 (VCC pin) to stop the VCO. (Note) The maximum voltage to be applied to pin 7 must not exceed the voltage on pin 3. Free-running frequency check method : Use either of the following two methods. a) Connect pin 4 to a frequency counter through the high input impedance amplifier. Figure 1 No.2619-3/6 LA3335M b) Connect the connection point of the semifixed resistor connected to pin 4 and the fixed resistor to a frequency counter through the RX of 240 kΩ. Fig. 2 shows how the error changes as the RX value is decreased. Error, ∆f – % ∆F – RX RX – Ω Figure 2 Separation setting mothod The LA3335M is so designed that the sub-signal gain is approximately 1.25 times as high as the main signal gain. The separation can be set by attenuating the sub-signal of the FM detection output. (See Figure 3) Ro 6 Output impedance Figure 3 The value of capacitor Co depends on the attenuation of the sub-signal of the FM detection output and the IF IC output impedance Ro. Fig. 4 shows the value of separation setting capacitor Co when Ro is set to 3 kΩ. For example, when the attenuation of sub-signal of the IF IC output is 0.9 time that of the main signal, it is seen from Figure 4 that the value of Co is approximately 500 pF. Co – Attenuation Capacitor value, Co – pF 3. Vs = Sub-signal peak value Vm = main signal peak value Separation : 35 to 40 dB, set to double hump response. Input sub-signal attenuation, m – dB Figure 4 No.2619-4/6 LA3335M THD – f Total harmonic distortion, THD – % Total harmonic distortion, THD – % THD – VCC Frequency, f – Hz Supply voltage, VCC – V CHsep – f Channel separation, CHsep – dB Total harmonic distortion, THD – % THD – VIN Input voltage, VIN – mV Sep – VCC Free-running frequency: VCC = 3 V Frequency, f – Hz VO – VCC Output level, VO – mV Separation, Sep – dB Free-running frequency: VCC = 3 V Free funning frequency: VCC = 3 V Supply voltage, VCC – V Capture range Free-running frequency : VCC = 3 V ON level OFF level Supply voltage, VCC – V Pilot level – mV Lamp ON/OFF Level – mV Supply voltage, VCC – V Lamp ON/OFF level – VCC Capture range, CzR – % No.2619-5/6 LA3335M ICCO – VCC fF – VCC No input Quiescent current, ICCO – mA Free-running frequency, fF – kHz No input Supply voltage, VCC – V Supply voltage, VCC – V No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of October, 1996. Specifications and information herein are subject to change without notice. No.2619-6/6