NTE NTE1842 Datasheet

NTE1842
Integrated Circuit
FM/AM IF System

Description:

The NTE1842 is a FM/AM IF system IC in a 16–Lead DIP type package designed for portable use.
As compared with conventional ICs, this device is greatly improved in external parts counts and elec­trical characteristics, espeically tweet and overload distortions.

Features:

D Low Supply Current, AM: 7mA, FM: 10mA (Typ)
D Low Number of External Components
D Excellent Tweet
D Low Overvoltage Distortion
D Tuning Indicator LED Driving Capability: I
D Built–In FM/AM Mode Switch
D Common Output for FM/AM
D Operating Supply Voltage Range: V

CC9opr)

= 10mA (Max)

LAMP

= 3V to 8V

Absolute Maximum Ratings:

Supply Voltage, V
Lamp Current, I
Power Dissipation, P

CC

LAMP

D

(TA = +25°C unless otherwise specified)

Derate Above 25°C 6mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Temperature Range, T
Storage Temperature Range, T

DC Characteristics:

Pin1 Voltage (AM Mix Input) V
Pin2 Voltage (AM Mix Bypass) V
Pin3 Voltage (AM OSC) V
Pin4 Voltage (Reg) V

(VCC = 5V, Pin Voltage at No Signal)

Parameter Symbol

opr

stg

8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

–25°C to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–55° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical

AM FM

1
2
3
4

1.5 0 V

1.5 0 V

2.3 2.3 V

2.3 2.3 V

Unit

DC Characteristics (Cont’d): (VCC = 5V, Pin Voltage at No Signal)

Parameter Symbol

Typical

AM FM

Unit

Pin5 Voltage (AM IF Output) V
Pin6 Voltage (Meter Output) V
Pin7 Voltage (LED) V
Pin8 Voltage (GND) V
Pin9 Voltage (Detector Output) V
Pin10 Voltage (VCC) V
Pin11 Voltage (FM Detector) V
Pin12 Voltage (AM IF Bypass) V
Pin13 Voltage (AM IF Input) V
Pin14 Voltage (FM IF Bypass) V
Pin15 Voltage (FM IF Input) V
Pin16 Voltage (AM Mix Output) V

5
6
7
8

9
10
11
12
13
14
15
16

1.0 0.9 V

1.0 0.9 V
– – V
0 0 V

1.4 1.5 V

5.0 5.0 V

5.0 5.0 V

1.5 1.5 V

1.5 1.5 V

1.5 1.5 V

1.5 1.5 V

5.0 5.0 V

AC Characteristics: (VCC = 5V, TA = +25°C FM: f = 10.7MHz, ∆f = ±22.5kHz, fm = 400Hz

Parameter Symbol Test Conditions Min Typ Max Unit

Supply Current I

CC

AM: f = 1MHz, MOD = 30%, f

FM VIN = 0 – 10 15 mA
AM VIN = 0 – 7 10 mA

= 400Hz)

m

Pin5 Output Resistance R

f = 1kHz – 3.0 – kΩ

09

FM

Input Limiting Voltage V
Recovered Output Voltage V

IN(lim)

OD

–3dB Limiting – 40 46 dBµ

VIN = 66dBµV 57 85 114 mV
Signal–to–Noise Ratio S/N VIN = 80dBµV – 65 – dB
Total Harmonic Distortion THD VIN = 80dBµV – 0.05 – %
AM Rejection Ratio AMR VIN = 80dBµV – 38 – dBµ
Meter Drive Voltage V
Lamp ON Sensitivity V

VIN = 100dBµV – 1.8 – V

M

IL = 1mA – 46 52 dB

L

AM

Gain G
Recovered Output Voltage V

OD

VIN = 26dBµV 15 30 75 mV

V

VIN = 60dBµV 65 95 125 mV
Signal–to–Noise Ratio S/N VIN = 60dBµV – 47 – dB
Total Harmonic Distortion THD VIN = 60dBµV – 1.0 – %
Meter Drive Voltage V
Lamp ON Sensitivity V
Local OSC Stop Voltage V

stop

VIN = 100dBµV – 1.8 – V

M

IL = 1mA – 28 – dBµ

L

R

= ∞ – 1.5 – V

DUMP

rms

rms
rms