NTE853 Integrated Circuit Low Power, Narrow Band, FM IF System Description: The NTE853 is a low power narrow band FM IF system which includes: Oscillator, Mixer, Limiting Amplifier, Quadrature Discriminator, Active Filter, Squelch, Scan Control and Mute Switch. The NTE853 is designed for use in FM dual conversion communications equipment. Features: D Low Drain Current (3mA Typ @ VCC = 6V) D Excellent Sensitivity: Input Limiting Voltage (–3.0dB) = 5.0µV (Typ) D Low Number of External Parts Required Absolute Maximum Ratings: (TA = +25°C, unless otherwise specified) Power Supply Voltage (Pin4), VCC(max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Operating Supply Voltage Range (Pin4), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4V to 8V Detector Input Voltage (Pin8), . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Vp–p Input Voltage (VCC ≥ 6V, Pin16), V16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1VRMS Mute Function (Pin14), V14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 5Vpk Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Electrical Characteristics: (VCC = 6V, fO = 10.7MHz, ∆f = ± 3kHz, fmod = 1kHz, TA = +25°C unless otherwise specified) Parameter Pin Test Conditions Min Typ Max Unit Drain Current, Squelch OFF 4 – 2 – mA Drain Current, Squelch ON 4 – 3 5 mA Input Limiting Voltage 16 – 5 10 µV Detector Output Voltage 9 – 3 – V Detector Output Impedance – – 400 – Ω Recovered Audio Output Voltage 9 200 350 – mVrms –3dB Limiting Vin = 10mV Electrical Characteristics (Cont’d): (VCC = 6V, fO = 10.7MHz, ∆f = ± 3kHz, fmod = 1kHz, TA = +25°C unless otherwise specified) Parameter Pin Test Conditions Vin = 10mV, 10kHz Min Typ Max Unit 40 46 – dB Filter Gain – Filter Output Voltage 11 1.8 2.0 2.5 V Trigger Hysteresis – – 100 – mV Mute Function, LOW 14 – 15 50 Ω Mute Function, HIGH 14 1 10 – MΩ Scan Function, LOW 13 Mute OFF, V12 = 2V – 0 0.5 V Scan Function, HIGH 13 Mute ON, V12 = GND 5.0 – – V Mixer Conversion Gain 3 – 20 – dB Mixer Input Resistance 16 – 3.3 – kΩ Mixer Input Capacitance 16 – 2.2 – pF Pin Connection Diagram Crystal OSC 1 16 RF Input Crystal OSC 2 Mixer Output 3 15 GND 14 Audio Mute VCC 4 13 Scan Control Limiter Input 5 12 Squelch Input Decoupling 6 Limiter Output 7 11 Filter Output 10 Filter Input 9 Demodulator Output Quad Input 8 16 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)