LA1837M

Ordering number : EN8271 Monolithic Linear IC LA1837M Overview Single-Chip AM/FM Tuner IC for Home Stereo Systems The LA1837M is a single-chip AM/FM tuner IC that provides AM and FM IF and multiplex decoding circuits for electronic tuning and was developed for use in home stereo systems. It provides both SD and IF counting techniques for optimal implementation of automatic station selection. Features • On-chip MPX VCO circuit (no external components required). • Adjacent channel interference rejection function (third order and fifth order). • Supports both the SD and IF counting technique (built-in SD speedup function). • The AM and FM SD sensitivity can be set independently. • The AM and FM output levels can be set independently. • Improved basic FM reception performance. Functions • AM: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, oscillator buffer, S-meter, narrow band SD, IF buffer • FM IF: IF amplifier, quadrature detector, S-meter, SD, S curve detection, IF buffer output • Multiplex stereo decoding: PLL stereo decoder, stereo indicator, forced monaural, VCO stop function, post amplifier, audio muting, adjacent channel interference rejection function Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta≤70°C* Conditions Ratings 12 550 -20 to +70 -40 to +125 Unit V mW °C °C *: Mounting board: 114.3×76.1×1.6mm glass epoxy board Any and all SANYO Semiconductor products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO Semiconductor representative nearest you before using any SANYO Semiconductor products described or contained herein in such applications. SANYO Semiconductor assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor products described or contained herein. 92706 / O3105 MS OT B8-3807 No.8271-1/9 LA1837M Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCC op Conditions Ratings 9 7.0 to 11.0 Unit V V Electrical Characteristics at Ta = 25°C VCC = 9.0V, in the specified circuit. Parameter Symbol Conditions min [FM Mono Characteristics] fc = 10.7MHz, fm = 1kHz, with the coil adjusted so that VAFC - VREG = 0V. Current drain Demodulator output Channel balance Total harmonic distortion (mono) Signal-to-noise ratio AM rejection ratio Input limiting voltage LED on sensitivity LED on bandwidth IF counter buffer output S-meter output ICCO-FM VOFM C.B-mono THDFM1 THDFM2 S/NFM AMR -3dBL.S SDON-FM SDBW VIFBUFF-FM VSM FM1 VSM FM2 Muting attenuation Mute Alt 100dBµ 100dBµ, pin 13 output 0dBµ, pin 11 output 100dBµ, pin 11 output 100dBµ, 100% mod, the pin 16 output No input 100dBµ, 100% mod, pin 16 output 100dBµ, 100% mod, pin 16 output / pin 17 output 100dBµ, 100% mod, pin 16 output 100dBµ, 200% mod, pin 16 output 100dBµ, 100% mod, pin 16 output 100dBµ, AM 30% mod, pin 16 output Referenced to 100dBµ, 100% mod, the input for output is -3dB down. 51 85 80 0 3.6 75 60 120 120 0.1 4.3 85 69 170 160 0.5 5.0 dBµ kHz mVrms V V dB 72 45 26 18 730 -1.5 31 1100 0 0.3 1.0 80 65 32 38 44 1460 +1.5 1.3 5.0 mA mVrms dB % % dB dB dBµ Ratings typ max Unit [FM Stereo Characteristics] fc = 10.7MHz, 100dBµ, fm = 1kHz, L+R = 90%, pilot = 10% Separation: L Separation: R Stereo on level Stereo off level Total harmonic distortion (main) Adjacent channel interference rejection ratio [AM Characteristics] Current drain Output detector ICCO-AM VOAM1 VOAM2 Signal-to-noise ratio S/N AM1 S/N AM 2 Total harmonic distortion LED-ON sensitivity Oscillator buffer output IF counter buffer output ST IF output S-meter output THD AM 1 THD AM 2 SDOn-AM VOSC-AM VIFBuff-AM VSTIF-AM VSM-AM No input, pin 30 output 80dBµ, non-mod, pin 13 output 80dBµ, non-mod, pin 7 output 0dBµ, non-mod No input 23dBµ, 30% mod, pin 16 output 80dBµ, 30% mod, pin 16 output 23dBµ, 30% mod, pin 16 output 80dBµ, 30% mod, pin 16 output 80dBµ, 30% mod, pin 16 output 80dBµ, 80% mod, pin 16 output 17 110 160 16 0 15 100 200 18 49 25 180 320 22 55 0.4 1.0 27 160 220 34 0 1.2 4.0 37 220 300 48 0.2 35 360 500 mA mVrms mVrms dB dB % % dBµ mVrms mVrms mVrms V Brej-5th Brej-3rd fs = 113kHz, Vs = 90%, Pilot = 10% Pin 16 output, versus L-R mod. 1kHz demodulator output fs = 189kHz, Vs = 90%, Pilot = 10% Pin 16 output, versus L-R mod. 1kHz demodulator output 40 dB 40 dB SepL SepR STON STOFF THD main Lmod. pin 16 output / pin 17 output Rmod. pin 17 output / pin 16 output The pilot mod such that V7 < 0.7V The pilot mod such that V7 > 4.5V L+R mod. Pin 16 output 30 30 1.3 45 45 2.7 1.5 0.3 1.3 5.0 dB dB % % % No.8271-2/9 LA1837M Package Dimensions unit : mm 3073C Block Diagram No.8271-3/9 LA1837M Coil Specifications • AM oscillator (for the DUT) HW-50425 (Mitsumi Electric Co., Ltd.) • IFT YD-1073-1 (Mitsumi Electric Co., Ltd.) • FM-DET 600BEAS-9715Z (Toko Electric Corporation) Pin Function Pin No. 1 Pin FM IF input Pin voltage Vreg Equivalent circuit Pin function Input impedance ri = 330 Ω 2 AM mixer output VCC Connect the mixer coil between this pin and VCC. 3 4 FM IF input bypass AM IF input Vreg Vreg See pin 1 Also used for the multiplex regulator filter Input impedance ri = 2 kΩ 5 6 7 GND TU-LED, ST-LED, AM - IF output 0V VCC VCC Active low Open collector AM stereo IF output (pin 7) This pin must be set up with an influx current under 150µA. 8 9 FM detector VCC VCC Recommended detector coil 600BEAS-9715Z (The Toko Electric Corporation) Continued on next page. No.8271-4/9 LA1837M Continued from preceding page. Pin No. 10 Pin AM narrow band ceramic filter connection Pin voltage 1.3V Equivalent circuit Pin function Recommended narrow band ceramic filter BFU450C4N (Murata Mfg. Co., Ltd.) When the narrow band SD function is not used, bypass this circuit by connecting a 50Ω resistor and a 0.047µF capacitor in series. 11 FM S-meter output 0V RL = 8kΩ 12 AM S-meter output, AM SD sensitivity adjustment 0V (AM) The AM SD sensitivity can be adjusted with an external resistor between this pin and ground. 13 AM/FM IF buffer output, Output control switch (muting switch) 0V V13 ≤ 0.5V: Reception state 1.4V ≤ V13 ≤ 2.2V: IF buffer output on V13 ≥ 3.5V: IF buffer output and muting on 14 Phase comparator low-pass filter (FM/AM switching) VCC-1.4 (FM) 0V (AM) The IC switches to AM mode when this pin is connected to ground through a resistor. Resistor value limits: 2.7kΩ (when VCC = 7V) 3.9kΩ (8V) 5.1kΩ (9V) 6.2kΩ (10V) 7.5kΩ (11V) 15 Pilot detector low-pass filter (Forced monaural) (VCO stop) VCC-1.0 When a current of over 50µA is sourced by this pin, the IC switches to forced monaural mode. The VCO is stopped if this pin is connected to ground. The resistor value limits are the same as for pin 14. Output impedance ro = 200Ω Pin 16: right output, pin 17: left output Inverting input pins Pin 18: right input, pin 19: left input RNF = 33kΩ Output impedance ro = 3.3kΩ Pin 20: Right channel deemphasis Pin 21: Left channel deemphasis 16 17 18 19 Post amplifier I/O Verg Verg 20 21 Multiplex output 3.5V 3.5V 22 Multiplex input 2.9V Input impedance ri = 20kΩ 23 FM demodulated output 2.8V (FM) 2.8V (AM) Output impedance ro = 3.0kΩ The separation can be adjusted with an external capacitor connected between this pin and ground. The VOsub/VOmain ratio is set to be approximately 0dB. Continued on next page. No.8271-5/9 LA1837M Continued from preceding page. Pin No. 24 Pin AM detector output Pin voltage 0V (FM) 0.5V (AM) Equivalent circuit Pin function Output impedance ro = 3.3kΩ The AM frequency characteristics can be adjusted with an RC circuit connected between pin 22 and ground. 25 AM AGC 0V (FM) 0.5V (AM) Internal load resistance R = 11kΩ 26 AFC Vreg The FM SD bandwidth can be adjusted with an external resistor connected between this pin and pin 28. 27 AM RF input Vreg This pin must be held at the same potential as pin 28 28 REG Vreg Vreg = 3.6V 29 OSC Vreg Connect the oscillator coil between this pin and pin 28. 30 Oscillator buffer output, FM SD sensitivity adjustment 1.6V (FM) 1.3V (AM) The FM SD sensitivity can be adjusted with an external resistor connected between this pin and ground. Output impedance ro = 20Ω No.8271-6/9 LA1837M No.8271-7/9 LA1837M No.8271-8/9 LA1837M Test Circuit Specifications of any and all SANYO Semiconductor products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Semiconductor Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. 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Specifications and information herein are subject to change without notice. PS No.8271-9/9