NTE1557 Integrated Circuit FM/AM IF System Description: The NTE1557 is a monolithic integrated circuit in a 16–Lead DIP type package developed for the radio cassette tape recorder included AM/FM IF amplifier and detector. Functions: D AM Section: IF Amplifier with AGC Detector D Voltage Regulator for RF External Circuit D FM Section: IF Amplifier Quadrature Detector Post Amplifier Signal Meter Driver Circuit Features: D Suitable for Radio Cassette and Home Stereo D Wide Operating Supply Voltage Range (3.0V to 14V) D Low Quiescent Circuit Current D AM Section D Simplified Input Circuit IFT (Ceramic Filter Type) RF AGC Available D FM Section: High Limiting Sensitivity (33dBµ, Typ) Low Residual Noise (45dB at Vi = –10dBµ) Small Side Peak of Detuned Output Voltage Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Electrical Characteristics: (TA = +25°C, VCC = 5.5V, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Vi = 0 7 11 16.5 mA VO (Vi = 100dBµ) –3dB – 33 38 dBµ FM Section (f = 10.7MHz, fm = 1kHz, ∆f = ±75kHz) Quiescent Circuit Current ICC Input Limiting Sensitivity Vi(lim) Detector Output Voltage VO VI = 100dBµ 180 245 310 mV Total Harmonic Distortion THD Vi = 100dBµ – 0.3 1.0 % AM Rejection Ratio AMR Vi = 100dBµ 50 60 – dB Signal to Noise Ratio S/N Vi = 100dBµ 72 83 – dB Signal Meter Output VM Vi = 100dBµ 1.05 1.5 2.05 V Residual Noise VN VO (AF) (Vi = 100dBµ) – 45 – dB VI = 37dBµ, Mute SW on – 35 – dB – 8 – mA – 29 – dBµ Muting Attenuation M(att) AM Section (f = 455kHz, fm = 1kHz, 30% Mod) Quiescent Circuit Current Maximum Sensitivity ICC Vi = 0 Vi(sen) VO (AF) = 10mV Detector Output Voltage Vo Vi = 74dBµ 45 65 85 mV Total Harmonic Distortion THD Vi = 74dBµ – 0.3 2.0 % Vi = 100dB – 0.7 3.5 % Signal to Noise Ratio S/N Vi = 74dBµ 45 55 – dBµ Signal Meter Output VM VI = 100dBµ 1.2 1.4 1.6 V Input Impedance (Pin 16) Ri Pin 16 0.8–0.9VDC 1.45 2.12 2.8 kΩ Pin Connection Diagram 1st IF Amp Input (FM) 1 1st IF Decouple (FM) 2 VCC (FM) 3 1st IF Amp Output (FM) 4 GND 5 2nd IF Amp Input (FM) 6 Voltage Regulator 7 Phase Shifter (FM) 8 16 1st IF Amp Input (AM) 15 AGC Decouple 14 2nd IF Amp Input (AM) 13 GND 12 Detector Output 11 VCC 10 Center Meter 9 FM Output 16 9 1 8 .870 (22.0) Max .260 (6.6) Max .200 (5.08) Max .100 (2.54) .700 (17.78) .099 (2.5) Min