NTE NTE787 Datasheet

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 , I F 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 T

= +50°C), P

A

D

Derate Above TA = +50°C 7.6mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Ambient Temperature Range, T
Storage Temperature Range, T

stg

opr

Lead Temperature (During Soldering, 1/32” from case, 10sec max), T

Electrical Characteristics:

Parameter Symbol Test Conditions Min Typ Max Unit

Static Characteristics

DC Voltage

Pin1, Pin4, Pin9, Pin11
Pin2, Pin7, Pin8 V2, V7, V
Pin10 V
Pin12 V
Pin15 V

DC Current

Pin3
Pin6 I
Pin10 I
Pin13 I
Pin16 I

Dynamic Characteristics

(TA = +25°C, V+ = 12V unless otherwise specified)

V1, V4, V9, V

I

10
13
16

11

8
10
12
15

3
6

760mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40° to +85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

L

– 0.7 – V
– 1.4 – V
– 5.6 – V
– 0 – V
– 3.5 – V

– 0.35 – mA
– 1.0 – mA
– 20 – mA
– 0 – mA
– 1.2 – mA

+265°C. . . . . . . . . . . . . . . . .

Detector Output 30% Modulation – 75 – mV
Audio Amplifier Gain A

AF

Audio Distortion V

f = 1kHz – 30 – dB

= 100mV – 0.2 – %

OUT

Sensitivity

At Converter Stage Input

At RF Stage Input

fIN = 1MHz,
Signal–to–Noise Ratio (S/N) = 20dB

– 200 – µV/m
– 100 – µV/m

Total Harmonic Distortion THD 30% Modulation – 1.0 – %
Input Resistance

At Transistor Q1

At Transistor Q5

R

IN

No AGC,
Input Frequency Signal (fIN) = 1MHz

– 3500 – Ω
– 2000 – Ω

Input Capacitance

At Transistor Q1

C

IN

– 17 – pF

At Transistor Q5 – 12 – pF

Feedback Capacitance

At Transistor Q1

C

FB

– 1.5 – pF

At Transistor Q5 – 1.5 – pF

rms