NTE1237 Integrated Circuit AM Radio without Audio Stage Features: D Small External Part Count D Tuning Meter Circuit D Wide AGC Range Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Power Dissipation, PT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +125°C Electrical Characteristics: (VCC = 12V, f = 1MHz unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Maximum Sensitivity MS fM = 400Hz, MOD = 30%, Output=50mV Signal–to–Noise Ratio S/N fM = 400Hz, Input = 40dB/m MOD = 30% Input = 74dB/m 8 12 – dB 42 45 – dB fM = 400Hz MOD = 30%, Input = 74dB/m – 1.0 2.0 % MOD = 80%, Input = 74dB/m – 1.5 3.0 % MOD = 30%, Input =120dB/m – 2.5 10 % Total Harmonic Distortion Detector Voltage THD VO(DET) fM = 400Hz, MOD = 30%, Input = 74dB/m Tuning Meter Circuit TM Quiescent Current IQ Input = 74dB/m 37.5 40.0 42.5 dB 140 170 230 mW 50 – 100 % – 13 21 mA Pin Connection Diagram Input 1 14 Tuning Meter VCC RF/OSC 2 13 AGC Amp Input VCC RF 3 12 Detector Input Converter Output 4 11 Audio Output OSC Tank 5 10 VCC IF/Audio 9 GND Converter Input 6 IF Input 7 8 IF Output 14 8 1 7 .827 (21.0) Max .300 (7.62) .197 (5.0) Max .100 (2.45) .600 (15.24) .099 (2.5) Min