OrdeOrdering numbering numberr : EN8271 : EN8271 LA1837M Monolithic Linear IC LA1837M Operating Conditions at Ta = 25C Parameter Symbol Conditions Ratings Unit Recommended supply voltage V 9 V CC Operating supply voltage range V op 7.0 to 11.0 V CC Electrical Characteristics at Ta = 25C V = 9.0V, in the specified circuit. CC Ratings Parameter Symbol Conditions Unit min typ max FM Mono Characteristics fc = 10.7MHz, fm = 1kHz, with the coil adjusted so that V - V = 0V. AFC REG Current drain I No input 18 31 44 mA CCO-FM Demodulator output V 100dB, 100% mod, pin 16 output 730 1100 1460 mVrms OFM Channel balance C.B-mono 100dB, 100% mod, pin 16 output / pin 17 output -1.5 0 +1.5 dB Total harmonic THD 1 100dB, 100% mod, pin 16 output 0.3 1.3 % FM distortion (mono) THD 2 100dB, 200% mod, pin 16 output 1.0 5.0 % FM Signal-to-noise ratio S/N 100dB, 100% mod, pin 16 output 72 80 dB FM AM rejection ratio AMR 100dB, AM 30% mod, pin 16 output 45 65 dB Input limiting voltage -3dBL.S Referenced to 100dB, 100% mod, the input for output 26 32 38 dB is -3dB down. LED on sensitivity SD 51 60 69 dB ON-FM LED on bandwidth SD 100dB 85 120 170 kHz BW IF counter buffer output V 100dB, pin 13 output 80 120 160 mVrms IFBUFF-FM S-meter output V 1 0dB, pin 11 output 0 0.1 0.5 V SM FM V 2 100dB, pin 11 output 3.6 4.3 5.0 V SM FM Muting attenuation Mute Alt 100dB, 100% mod, the pin 16 output 75 85 dB FM Stereo Characteristics fc = 10.7MHz, 100dB, fm = 1kHz, L+R = 90%, pilot = 10% Separation: L SepL Lmod. pin 16 output / pin 17 output 30 45 dB Separation: R SepR Rmod. pin 17 output / pin 16 output 30 45 dB Stereo on level ST The pilot mod such that V7 < 0.7V 1.3 2.7 5.0 % ON Stereo off level ST The pilot mod such that V7 > 4.5V 1.5 % OFF Total harmonic THD main L+R mod. Pin 16 output 0.3 1.3 % distortion (main) Adjacent channel Brej-3rd fs = 113kHz, Vs = 90%, Pilot = 10% 40 dB interference rejection Pin 16 output, versus L-R mod. 1kHz demodulator output ratio Brej-5th fs = 189kHz, Vs = 90%, Pilot = 10% 40 dB Pin 16 output, versus L-R mod. 1kHz demodulator output AM Characteristics Current drain IC No input 15 25 35 mA CO-AM Output detector V 1 23dB, 30% mod, pin 16 output 100 180 360 mVrms OAM V 2 80dB, 30% mod, pin 16 output 200 320 500 mVrms OAM Signal-to-noise ratio S/N 1 23dB, 30% mod, pin 16 output 18 22 dB AM S/N 2 80dB, 30% mod, pin 16 output 49 55 dB AM Total harmonic THD 1 80dB, 30% mod, pin 16 output 0.4 1.2 % AM distortion THD 2 80dB, 80% mod, pin 16 output 1.0 4.0 % AM LED-ON sensitivity SD 17 27 37 dB On-AM Oscillator buffer output V No input, pin 30 output 110 160 220 mVrms OSC-AM IF counter buffer output V 80dB, non-mod, pin 13 output 160 220 300 mVrms IFBuff-AM ST IF output V 80dB, non-mod, pin 7 output 16 34 48 mVrms STIF-AM S-meter output V 0dB, non-mod 0 0 0.2 V SM-AM No.8271-2/9