NTE787 Integrated Circuit AM Receiver Subsystem For Applications in a variety of AM broadcast and communications receivers and applications requiring an array of amplifiers. Description: The NTE787, a monolithic integrated circuit, is an AM subsystem that provides the converter, IF amplifier, detector, and audio preamplifier stages for an AM receiver. It also provides internal AGC for the first IF amplifier stage, delayed AGC for an optional external RF amplifier, a buffer stage to drive a tuning meter, and terminals facilitating the optional use of a tone control. This device features four independent transistor amplifiers, each incorporating internal biasing for temperature tracking. These amplifiers are particularly useful in general–purpose amplifier, oscillator, and detector applications in a wide variety of equipment designs. The NTE787 utilizes a 16–Lead DIP package and operates over an ambient temperature range of –40° to +85°C. Features: D Excellent overload characteristics D AGC for IF amplifier D Buffered output signal for tuning meter D Internal Zener diode provides voltage regulation D Two IF amplifiers stages D Low–noise converter and first IF amplifier D Low harmonic distortion (THD) D Delayed AGC for RF amplifier D Terminals for optional inclusion of tone control D Operates from wide range of power supplies: V+ = 6 to 16 volts D Optional AC and/or DC feedback on wide–band amplifier D Array of amplifiers for general–purpose applications D Suitable for use with optional external RF stage, either MOS or bipolar Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) DC Supply Voltage (Across Pin5 and Pin3, Pin6, Pin13, Pin16 respectively) . . . . . . . . . . . . . . . 16V DC Current At Pin3, Pin6, Pin13, Pin16 respectively . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA At Pin10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA Device Dissipation (Up to TA = +50°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 760mW Derate Above TA = +50°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6mW/°C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering, 1/32” from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265°C Electrical Characteristics: (TA = +25°C, V+ = 12V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit V1, V4, V9, V11 – 0.7 – V V2, V7, V8 – 1.4 – V Pin10 V10 – 5.6 – V Pin12 V12 – 0 – V Pin15 V15 – 3.5 – V DC Current Pin3 I3 – 0.35 – mA Pin6 I6 – 1.0 – mA Pin10 I10 – 20 – mA Pin13 I13 – 0 – mA Pin16 I16 – 1.2 – mA 30% Modulation – 75 – mVrms f = 1kHz – 30 – dB VOUT = 100mV – 0.2 – % fIN = 1MHz, Signal–to–Noise Ratio (S/N) = 20dB – 200 – µV/m – 100 – µV/m Static Characteristics DC Voltage Pin1, Pin4, Pin9, Pin11 Pin2, Pin7, Pin8 Dynamic Characteristics Detector Output Audio Amplifier Gain AAF Audio Distortion Sensitivity At Converter Stage Input At RF Stage Input Total Harmonic Distortion THD 30% Modulation – 1.0 – % Input Resistance At Transistor Q1 RIN No AGC, Input Frequency Signal (fIN) = 1MHz – 3500 – Ω – 2000 – Ω – 17 – pF – 12 – pF – 1.5 – pF – 1.5 – pF At Transistor Q5 Input Capacitance At Transistor Q1 CIN At Transistor Q5 Feedback Capacitance At Transistor Q1 At Transistor Q5 CFB Pin Connection Diagram Converter Input Bypass 1 16 VCC Converter Input 2 15 Audio Output Converter Output 3 14 From Detector Filter 1st IF Amp Input 4 13 AGC Output from RF Amp Substrate GND 5 12 To Tuning Meter 1st IF Amp Output 6 11 AGC Filter 2nd IF Feedback 7 10 VCC 2nd IF Amp Input 8 9 16 9 1 8 To Detector Filter & Audio .260 (6.6) Max .870 (22.0) Max .200 (5.08) Max .100 (2.54) .700 (17.78) .099 (2.5) Min