NTE NTE746 Datasheet

NTE746

Integrated Circuit

TV Video IF Amplifier

Description:

The NTE746 is a monolithic integrated circuit in an 8–Lead DIP type package with wide–range AGC

st

for replacement of 1

rd

drive a 3

IF stage.

Features:

D Center Frequency: FO = 45MHz
D Bandwidth: BW = 6MHz
D Power Gain: 50dB Min
D AGC Range: 60dB Min
D Low Reverse–Transfer Admittance: 1µmho Typ

Applications:

D TV Video IF
D Defense Communications Satellite Programs
D Combined AM/FM Radio IF Amplifiers
D Linear Switch or Chopper for Multiplex Modulation or Demodulation

and 2nd IF stages in solid–state color and black and white TV sets. It will directly

D Y

Constant to 75MHz

21

D 12V Operation, Single–Polarity Power Supply
D Total Supply Current: 20mA Typ
D Nearly Constant Input and Output Admittance

over the Entire AGC Range

Absolute Maximum Ratings:

(TA = +25°C)

Power Supply, V+ 18V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Supply, V
AGC Supply, V
Differential Input Voltage, V
Power Dissipation, P

1

AGC

, V

8

4V < V

in

D

AGC

625mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Derate Above 25°C 5mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Temperature Range, T

Electrical Characteristics:

Parameter Symbol Test Conditions Min Typ Max Unit

DC Characteristics

Total Supply Current I
Output Stage Current I1 + I
AGC Supply Voltage V

AGC Supply Current I

A

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

S

AGC

AGC

Pin1, Pin2, and Pin8 – 20 – mA

8

0dB Attenuation – 5.0 – V
60dB Attenuation – 6.9 – V
0db Attenuation – 0.1 – mA
60dB Attenuation – 0.2 – mA

– 6.5 – mA

0° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

< V+. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±7V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Characteristics (Cont’d): (V+ = 12V, TA = +25°C unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Small–Signal Characteristics (f = 45MHz)

Power Gain BW = 6MHz – 46 50 dB
Y–Parameters

Single–Ended Input Admittance

g11 – 1.0 – mmho
b11 – 2.8 – mmho

Differential Output Admittance g22 – 0.07 – mmho

b22 – 0.50 – mmho

Differential Admittance Variation w/ AGC

Input Admittance

g11 0dB to 60dB – 0.06 – mmho
b11 – 0.0 – mmho

Output Admittance g22 – 0.004 – mmho

b22 – 0.04 – mmho
Y

0dB Agc – 0.2 – mho

21

Useable AGC Range in 45MHz TV IF – > 60 – dB

Pin Connection Diagram

IF Output

V

CC

GND

2
3

8
7

6

IF Output1
GND

(+) Input

(–) Input

85

14

4

.260 (6.6)

.390 (9.9)

Max

.155

(3.93)

5

Input

.300

(7.62)

.100 (2.54)

.145 (3.68)

.300 (7.62)