NTE1292 Integrated Circuit IF Amplifier and Detector Description: The NTE1292 is a monolithic integrated circuit in a 14–Lead DIP type package specifically designed for audio detection in TV and FM radio receivers. It incorporates an 8–stage limiting IF amplifier and balanced detector plus a DC operated volume control. Pin3 and Pin4 are connected to the collector and base of a transistor which may be used as an AF– preamplifier or as a switch. At Pin12 a zener–diode is accessible which can be used to stabilize the supply voltage of this integrated circuit or the voltage of other circuit elements in the set. Features: D Electronic Attenuator: Replaces Conventional AC Volume Control D Volume Reduction Range: 85dB Typ D Sensitivity: 3dB Limiting Voltage 30µV Typ D Excellent AM Rejection 68dB Typ at 10mV D Audio Output Voltage: 1V Typ D Wide Supply Voltage Range: VCC = 6V to 18V D Internal Zener Diode Regulator D Very Low External Component Requirement D Simple Detector Alignment: One Coil Absolute Maximum Ratings: Supply Voltage, V11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Volume Control Voltage, V5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4V Zener Current, I12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Transistor Collector Current, I3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Transistor Base Current, I4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Bias Resistance (Max), R13–14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1kΩ Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –15° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Electrical Characteristics: (VCC = 12V, TA = +25°C unless otherwise specified) Parameter Supply Current Symbol ICC Test Conditions Min Typ Max Unit R5 = ∞ 10 14 18 mA R5 = 0 11 – 20 mA IF Voltage Gain GV f = 5.5MHz – 68 – dB IF Output Voltage (Each Output) VO At Limiting 170 250 – mVP–P AF Output Voltage VAF f = 5.5MHz, ∆f = ±50kHz,fMOD = 1kHz, VI = 10mV, Q = 45 0.7 1.0 – V f = 5.5MHz, ∆f = 25khz, fMOD = 1kHz, VI = 10mV, Q = 45 – 1.5 – % f = 10.7MHz, ∆f = ±50kHz,fMOD = 1kHz, VI = 10mV, Q = 20 – 0.2 – % f = 5.5MHz, ∆f = ±50kHz,fMOD = 1kHz, Q = 45 – 30 60 µV – kΩ/pF Distortion Input Voltage Before Limiting VLIM Input Impedance ZI Output Resistance RO 1.9 2.6 3.3 kΩ Vaf Max Vaf Min 70 85 – dB VI = 0 6.2 7.3 8.4 V f = 5.5MHZ, ∆f = ±50kHZ, fMOD = 1kHZ, VI = 500µV, MOD = 30% 50 60 – dB f = 5.5MHZ, ∆f = ±50HZ, fMOD = 1kHZ, VI = 10mV, MOD = 30% – 68 – dB Volume Control Range DC Component of the Output Signal AM Rejection V8 aAM f = 5.5MHz 15/6 40/4.5 Potentiometer Resistance R5 1dB Attenuation – 3.7 4.7 kΩ Potentiometer Voltage V5 1dB Attenuation – 2.2 2.5 V Potentiometer Resistance R5 70dB Attenuation 1.0 1.4 – kΩ Potentiometer Voltage V5 70dB Attenuation – 1.2 – V Noise Voltage at Output V5 VI = 10mV – 30 – µV Zener Voltage V12 I12 = 5mA 11.2 12.0 13.4 V Zener Slope Resistance RZ – 30 50 Ω V(BR)CBO 45 65 – V V(BR)CEO I3 = 500µA 18 24 – V 50 100 500 Breakdown Voltage Current Gain hFE I3 = 1mA Pin Connection Diagram GND 1 14 Input Bias Decoupling 2 13 Input Bias Transistor Collector 3 12 Zener Transistor Base 4 11 Volume Control 5 10 IF Amp Output IF Amp Output 6 9 Phase Shift Network Phase Shift Network 7 8 Audio Output 14 8 1 7 VCC .300 (7.62) .785 (19.95) Max .200 (5.08) Max .100 (2.45) .600 (15.24) .099 (2.5) Min