FM IF FOR CAR RADIO S1A2245X01 INTRODUCTION The S1A2245X01 is a monolithic integrated circuit consisting of an FM IF amplifier and detector. It is suitable for car radios. 7−SIP FUNCTIONS • 3-stage IF amplifier • Peak detector FEATURES • Suitable for FM car radios • Wide operating supply voltage range: VCC = 8V − 14V • High detector output voltage (VO = 500mV, Typ) • Excellent AM rejection: AMR = 50dB (Typ) • High sensitivity: VI (LIM) = 50dBµV (Typ) • Simplified single coil tuning • Low distortion (THD = 0.1 %: Typ) • Minimum number of external parts required ORDERING INFORMATION Device Package Operating Temperature S1A2245X01-I0U0 7−SIP −20°C − +70°C 1 S1A2245X01 FM IF FOR CAR RADIO BLOCK DIAGRAM VCC 3 Regulated Power Supply INPUT 1 IF AMP FM DET AF OUTPUT 7 BYPASS 2 4 5 6 GND DET DET ABSOLUTE MAXIMUM RATINGS (Ta =25°°C) Characteristic Symbol Value Unit VCC 15 V Input Voltage VI 0.7 V Power Dissipation PD 400 mW Operating Temperature TOPR −20 − +70 °C Storage Temperature TSTG −40 − +125 °C Supply Voltage NOTE: Derated above Ta = 25°C in the proportion of 4 mW/°C 2 FM IF FOR CAR RADIO S1A2245X01 ELECTRICAL CHARACTERISTICS (Ta = 25°C, VCC = 12V, f = 10.7MHz, fm = 400Hz) Characteristic Symbol Quiescent Circuit Current ICCQ - 3dB Limiting Sensitivity AM Rejection Ratio Test Conditions Min. Typ. Max. Unit VI = 0 8 12 15 mA Vl(LlM) -3dB point from VO, VI = 80dBµ, ∆f = 75kHz − 50 55 dB AMR FM: ∆f = ± 75kHz dev AM: 30 % Mod Vl = 80dBµ − 50 − dB Detector Output Voltage VO ∆f = ± 75kHz dev VI = 80dBµV 300 500 700 mV Total Harmonic Distortion THD ∆f = ± 225kHz dev VI = 80dBµV − 0.2 − % Signal to Noise Ratio S/N ∆f = ± 75kHz dev VI = 80dBµV − 60 − dB TEST CIRCUIT VCC Tank Coil L 0.01µ C1 C2 0.01µ 10p 1 INPUT S1A2245X01 50 AF OUT 7 2 4 0.01µ C3 0.01µ 3 S1A2245X01 FM IF FOR CAR RADIO 15K 0.01µ APPLICATION CIRCUIT +VCC 100 L 0.01µ 330 (Tank Coil) 3 CF FRONT END 5 1 CF KSC838-0 330 2 0.01µ 10K 1K C2 10p C1 6 S1A2245X01 FM MPX 7 4 L R 0.01µ 0.01µ 1 f o = -------------------------------------------- C2 2π L C 1 + -------- 2 COIL SPECIFICATIONS 4 1 4 2 5 3 6 Co(pF) f(MHz) Qo(%) 27 10.7 150 Turns 4-6 − − 18 − −