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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 30V 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1k Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C
Electrical Characteristics: (VCC = 12V, TA = +25C unless otherwise specified)
Parameter Supply Current Symbol ICC GV VO VAF R5 = R5 = 0 IF Voltage Gain IF Output Voltage (Each Output) AF Output Voltage Distortion f = 5.5MHz At Limiting f = 5.5MHz, f = 50kHz,fMOD = 1kHz, VI = 10mV, Q = 45 f = 5.5MHz, f = 25khz, fMOD = 1kHz, VI = 10mV, Q = 45 f = 10.7MHz, f = 50kHz,fMOD = 1kHz, VI = 10mV, Q = 20 Input Voltage Before Limiting Input Impedance Output Resistance Volume Control Range DC Component of the Output Signal AM Rejection VLIM ZI RO Vaf Max Vaf Min V8 aAM VI = 0 f = 5.5MHZ, f = 50kHZ, fMOD = 1kHZ, VI = 500V, MOD = 30% f = 5.5MHZ, f = 50HZ, fMOD = 1kHZ, VI = 10mV, MOD = 30% Potentiometer Resistance Potentiometer Voltage Potentiometer Resistance Potentiometer Voltage Noise Voltage at Output Zener Voltage Zener Slope Resistance Breakdown Voltage R5 V5 R5 V5 V5 V12 RZ V(BR)CBO V(BR)CEO I3 = 500A Current Gain hFE I3 = 1mA 1dB Attenuation 1dB Attenuation 70dB Attenuation 70dB Attenuation VI = 10mV I12 = 5mA f = 5.5MHz, f = 50kHz,fMOD = 1kHz, Q = 45 f = 5.5MHz Test Conditions Min 10 11 - 170 0.7 - - - Typ 14 - 68 250 1.0 1.5 0.2 30 Max 18 20 - - - - - 60 - 3.3 - 8.4 - - 4.7 2.5 - - - 13.4 50 - - 500 Unit mA mA dB mVP-P V % % V k/pF k dB V dB dB k V k V V V V V
15/6 40/4.5 1.9 70 6.2 50 - - - 1.0 - - 11.2 - 45 18 50 2.6 85 7.3 60 68 3.7 2.2 1.4 1.2 30 12.0 30 65 24 100
Pin Connection Diagram
GND Bias Decoupling Transistor Collector Transistor Base Volume Control IF Amp Output Phase Shift Network
1 2 3 4 5 6 7
14 Input 13 Input Bias 12 Zener 11 VCC
10 IF Amp Output 9 8 Phase Shift Network Audio Output
14
8
1
7
.785 (19.95) Max .200 (5.08) Max
.300 (7.62)
.100 (2.45) .600 (15.24)
.099 (2.5) Min

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