NTE NTE744 Datasheet

NTE744

Integrated Circuit

RF/IF Amp

Description:

The NTE744 is a monolithic silicon integrated circuit that provides an rf amplifier, if amplifier, mixer,
oscillator, AGC detector, and voltage regulator on a single chip. It is intended for use in super–hetero­dyne AM radio receiver applications particularly in automobiles. The NTE744 is supplied in a 14–lead
dual–in–line plastic package and operates over the temperature range of –55° to 125°C.

Features:

D Low–noise, low–Rb, rf stage in cascode connection–eliminates Miller–Effect regeneration and

allows controlled power rise by the choice of external components.

D Mixer–oscillator stage with internal feedback–eliminates need for tapped or multi–winding os-

cillator coils

D Cascode if amplifier with controlled output impedance and negligible Miller Effect–eliminates

regeneration and selectivity skewing

D Frequency–counter AGC circuit–allows control of AGC response by selection of the coupling

capacitor.

D Integral regulation with built–in surge protection
D Separately accessible amplifiers

Absolute Maximum Ratings:

DC Supply Voltage (Pin3), V+ 9V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Supply Voltage (IF Output, Pin6) 40V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Supply Voltage (RF Output, Pin13) 20V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Supply Voltage (Mixer Output, Pin14) 20V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Current (Pin3) 35mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Dissipation (Up to T

Derate Above T
Operating Ambient Temperature Range, T
Storage Temperatur Range, T
Lead Temperature (During Soldering, 1/16” (1.59mm)from case, 10sec max), T

= +55°C), P

A

= 55°C 6.67mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A

stg

D

opr

L

750mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–55° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

+265°C. . . . . . . .

Electrical Characteristics: (TA = +25°C unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Static Characteristics

DC Voltage

At Pin1, Pin4
At Pin2, Pin3, Pin14 V2, V3, V
At Pin5 V
At Pin6 V
At Pin7 V
At Pin8, Pin9 V8, V
At Pin10, Pin11 V10, V
At Pin12 V
At Pin13 V

DC Current

Into Pin1, Pin4, Pin5, Pin7,

Pin8, Pin9, Pin10, Pin11, Pin12
Into Pin2 I
Into Pin3 I
Into Pin6 I
Into Pin13 I
Into Pin14 I

Performance Characteristics

V1, V

5
6
7

12
13

I1, I4, I5, I7,

I

, I9, I10, I

8

2
3

6
13
14

4

14

9
11

12

– 4.7 – V
– 6.8 – V
– 0.25 – V
– 12 – V
– 0.76 – V
– 0 – V
– 0.71 – V
– 0.71 – V
– 4.0 – V

– 0 – mA
– 1.2 – mA

– 15 – mA
– 4.3 – mA
– 4.5 – mA
– 0.17 – mA

Sensitivity Input Signal to Dummy Antenna at

f

= 1MHz, 30% AM Modulation at

IN

f

= 400Hz, for 11mV Output at V

MOD

O

Signal–to–Noise Ratio S/N Ratio of Output at VO with Modulation

ON & the OFF, Input Signal = 100µV,
30% AM Modulation at f

MOD

= 400Hz

Overload Distortion Input Signal set at 1MHz, 90% AM

Modulation, Distortion at V

must be

O

≤ 10%

Pin Connection Diagram

Mixer Input

OSC Tank

V

CC

Mixer Bypass

1
2

3
4
5AGC Drive
6IF Output

14

Mixer Output
RF Output

13

RF Input

12
11

RF Bypass

10 AGC Capacitor

9 RF GND

– 2.3 – µV

34 43 – dB

160k 400k – µV

7IF Input

Substrate & IF Amp GND

8