LA3335

Ordering number: EN2619B Monolithic Linear IC LA3335M PLL FM Multiplex Demodulator for 3 V Headphone Stereos and Radio-cassette Recorders Overview The LA3335M is PLL FM stereo multiplex demodulator IC designed for use in headphone stereos, etc. which operate from a low supply voltage. Package Dimensions 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 Lamp drive current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IL max Pd max Topr Tstg Ta % 70 °C Conditions Ratings 8 10 50 –20 to +70 –40 to +125 Unit V mA mW °C °C Operating Conditions at Ta = 25 °C Parameter Recommended supply voltage Operating voltage range Input signal voltage Symbol VCC VCC op VIN Conditions Ratings 3 1.8 to 6 150 Unit V V 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 Total harmonic distortion Output voltage Channel balance Lamp lighting level Lamp hysteresis Capture range Allowable input level Signal to noise ratio Symbol ICCO Ri Ro CHsep THD VO CB VL hy CR VIN max S/N Conditions No input 35 5.3 30 Monaural Stereo main Monaural Monaural Pilot Pilot 15 mV Monaural, THD = 5% Monaural min 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 90 1.5 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 Resistor Semifixed resistor Symbol R1 R2 VR1 C1 C2 C3 Capacitor C4 C5 C6 C7 Kind Carbon resistor Carbon resistor Carbon resistor Electrolytic capacitor Electrolytic capacitor Polystyrol capacitor Electrolytic capacitor Ceramic capacitor Ceramic capacitor Electrolytic capacitor Value 27 kΩ 560 Ω 10 kΩ 2.2 µF 0.1 µF 1000 pF 1 µF 6800 pF 6800 pF Remarks VCO time constant Limiting resistor VCO OSC frequency adjust DC blocking Loop filter VCO time constant Pilot detection De-emphasis De-emphasis Power supply ripple filter Typical Voltage and Name of Each Pin Pin No. 1 2 3 4 5 6 7 8 9 10 Voltage 1.2 V VCC–0.7 V VCC — — 0V — VCC–0.7 V 1.3 V 1.3 V Input PLL loop filter Power supply VCO NC GND Stereo indicator Pilot sync detection filter Decoder output (low) Decoder output (high) Open collector VCC–0.2 V 0.65 VCC Name Remarks Proper cares in using IC 1. 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. 2. 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. ∆F – RX Error, ∆f – % RX – Ω Figure 2 3. 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 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 Free-running frequency: VCC = 3 V Frequency, f – Hz THD – VIN Total harmonic distortion, THD – % Channel separation, CHsep – dB Supply voltage, VCC – V CHsep – f 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 funning frequency: VCC = 3 V Supply voltage, VCC – V Lamp ON/OFF level – VCC Lamp ON/OFF Level – mV Free-running frequency : VCC = 3 V Supply voltage, VCC – V Capture range ON level OFF level Supply voltage, VCC – V Capture range, CzR – % No.2619-5/6 Pilot level – mV LA3335M fF – VCC No input ICCO – VCC No input Free-running frequency, fF – kHz Supply voltage, VCC – V Quiescent current, ICCO – mA 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