NTE1842 Integrated Circuit FM/AM IF System Description: The NTE1842 is a FM/AM IF system IC in a 16–Lead DIP type package designed for portable use. As compared with conventional ICs, this device is greatly improved in external parts counts and electrical characteristics, espeically tweet and overload distortions. Features: D Low Supply Current, AM: 7mA, FM: 10mA (Typ) D Low Number of External Components D Excellent Tweet D Low Overvoltage Distortion D Tuning Indicator LED Driving Capability: ILAMP = 10mA (Max) D Built–In FM/AM Mode Switch D Common Output for FM/AM D Operating Supply Voltage Range: VCC9opr) = 3V to 8V Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V Lamp Current, ILAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6mW/°C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C DC Characteristics: (VCC = 5V, Pin Voltage at No Signal) Typical Parameter Symbol AM FM Unit Pin1 Voltage (AM Mix Input) V1 1.5 0 V Pin2 Voltage (AM Mix Bypass) V2 1.5 0 V Pin3 Voltage (AM OSC) V3 2.3 2.3 V Pin4 Voltage (Reg) V4 2.3 2.3 V DC Characteristics (Cont’d): (VCC = 5V, Pin Voltage at No Signal) Typical Parameter Symbol AM FM Unit Pin5 Voltage (AM IF Output) V5 1.0 0.9 V Pin6 Voltage (Meter Output) V6 1.0 0.9 V Pin7 Voltage (LED) V7 – – V Pin8 Voltage (GND) V8 0 0 V Pin9 Voltage (Detector Output) V9 1.4 1.5 V Pin10 Voltage (VCC) V10 5.0 5.0 V Pin11 Voltage (FM Detector) V11 5.0 5.0 V Pin12 Voltage (AM IF Bypass) V12 1.5 1.5 V Pin13 Voltage (AM IF Input) V13 1.5 1.5 V Pin14 Voltage (FM IF Bypass) V14 1.5 1.5 V Pin15 Voltage (FM IF Input) V15 1.5 1.5 V Pin16 Voltage (AM Mix Output) V16 5.0 5.0 V AC Characteristics: (VCC = 5V, TA = +25°C FM: f = 10.7MHz, ∆f = ±22.5kHz, fm = 400Hz AM: f = 1MHz, MOD = 30%, fm = 400Hz) Parameter Min Typ Max Unit FM VIN = 0 – 10 15 mA AM VIN = 0 – 7 10 mA f = 1kHz – 3.0 – kΩ VIN(lim) –3dB Limiting – 40 46 dBµ Recovered Output Voltage VOD VIN = 66dBµV 57 85 114 mVrms Signal–to–Noise Ratio S/N VIN = 80dBµV – 65 – dB Total Harmonic Distortion THD VIN = 80dBµV – 0.05 – % AM Rejection Ratio AMR VIN = 80dBµV – 38 – dBµ Meter Drive Voltage VM VIN = 100dBµV – 1.8 – V Lamp ON Sensitivity VL IL = 1mA – 46 52 dB Gain GV VIN = 26dBµV 15 30 75 mVrms Recovered Output Voltage VOD VIN = 60dBµV 65 95 125 mVrms Signal–to–Noise Ratio S/N VIN = 60dBµV – 47 – dB Total Harmonic Distortion THD VIN = 60dBµV – 1.0 – % Meter Drive Voltage VM VIN = 100dBµV – 1.8 – V Lamp ON Sensitivity VL IL = 1mA – 28 – dBµ RDUMP = ∞ – 1.5 – V Supply Current Pin5 Output Resistance Symbol ICC R09 Test Conditions FM Input Limiting Voltage AM Local OSC Stop Voltage Vstop Pin Connection Diagram AM Mix Input 1 16 AM Mix Output AM Mix Bypass 2 15 FM IF Input AM OSC 3 14 FM IF Bypass Reg 4 13 AM IF Input AM IF Output 5 12 AM IF Bypass Meter Output 6 11 FM Detector LED 7 10 VCC GND 8 9 16 Detector Output 9 .260 (6.6) Max 1 8 .300 (7.62) .785 (19.9) Max .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)