NTE1843 Integrated Circuit FM Front End Description: The NTE1843 is an integrated circuit in a 9–Lead SIP type package designed for use in FM front–end applications. Typical applications include portable radio and radio cassettes. Compared with conventional types, supply voltage dependence, overload characteristics and spurious radiation characteristics are improved. Features: D Wide Supply Voltage Range: VCC = 1.6V to 6.0V D Excellent Supply Voltage Dependence of Loacl Oscillator: Oscillator Stop VCC = 0.9V Typ D Improved Inter–Modulation Charactristics by Double Balanced Type Mixer Circuit D Low Spurious Radiation D Built–In Clamping Diode for the Local Oscillator Output Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4mW/°C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Electrical Characteristics: (TA = +25°C, VCC = 5V, f = 83MHz, fm = 1kHz, ∆f = 22.5kHz dev. unless otherwise specified) Parameter Min Typ Max Unit – 5.2 8.0 mA Vin(lim) – 3.0 7.0 dBµ Quiescent Sensitivity QS – 11 – dBµ Conversion Gain GC – 31 – dB 150 230 350 mVrms – 57 – Ω – 25 – kΩ – 2.0 – pF Supply Current –3dB Limiting Sensitivity Local OSC Voltage Symbol ICC VOSC Test Conditions VIN = 0 fOSC = 60MHz Parallel Input Resistance (Pin1 Impedance) rip1 Parallel Output Resistance (Pin3 Impedance) Parallel Output Capacitance (Pin3 Impedance) rop3 cop3 Parallel Input Resistance (Pin4 Impedance) rip4 – 2.7 – kΩ Parallel Input Capacitance (Pin4 Impedance) cip4 – 3.3 – pF Parallel Output Resistance (Pin6 Impedance) rop6 – 100 0 kΩ Parallel Output Capacitance (Pin6 Impedance) cop6 – 4.8 – pF Local OSC Stop Voltage Vstop – 0.9 1.3 V f = 83MHz f = 10.7MHz Pin Connection Diagram (Front View) 9 VCC 8 OSC Output 7 OSC Input 6 Mixer Output 5 GND 4 Mixer Input 3 Tuning Coil 2 Bypass 1 RF Input .126 (3.2) .323 (8.2) Max .100 (2.54) .906 (23.0) Max 1 9 .020 (0.50) .800 (20.3) .099 (2.5) Min