NTE NTE1842

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: ILAMP = 10mA (Max)
D Built–In FM/AM Mode Switch
D Common Output for FM/AM
D Operating Supply Voltage Range: VCC9opr) = 3V to 8V
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V
Lamp Current, ILAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6mW/°C
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
DC Characteristics: (VCC = 5V, Pin Voltage at No Signal)
Typical
Parameter
Symbol
AM
FM
Unit
Pin1 Voltage (AM Mix Input)
V1
1.5
0
V
Pin2 Voltage (AM Mix Bypass)
V2
1.5
0
V
Pin3 Voltage (AM OSC)
V3
2.3
2.3
V
Pin4 Voltage (Reg)
V4
2.3
2.3
V
DC Characteristics (Cont’d): (VCC = 5V, Pin Voltage at No Signal)
Typical
Parameter
Symbol
AM
FM
Unit
Pin5 Voltage (AM IF Output)
V5
1.0
0.9
V
Pin6 Voltage (Meter Output)
V6
1.0
0.9
V
Pin7 Voltage (LED)
V7
–
–
V
Pin8 Voltage (GND)
V8
0
0
V
Pin9 Voltage (Detector Output)
V9
1.4
1.5
V
Pin10 Voltage (VCC)
V10
5.0
5.0
V
Pin11 Voltage (FM Detector)
V11
5.0
5.0
V
Pin12 Voltage (AM IF Bypass)
V12
1.5
1.5
V
Pin13 Voltage (AM IF Input)
V13
1.5
1.5
V
Pin14 Voltage (FM IF Bypass)
V14
1.5
1.5
V
Pin15 Voltage (FM IF Input)
V15
1.5
1.5
V
Pin16 Voltage (AM Mix Output)
V16
5.0
5.0
V
AC Characteristics: (VCC = 5V, TA = +25°C FM: f = 10.7MHz, ∆f = ±22.5kHz, fm = 400Hz
AM: f = 1MHz, MOD = 30%, fm = 400Hz)
Parameter
Min
Typ
Max
Unit
FM VIN = 0
–
10
15
mA
AM VIN = 0
–
7
10
mA
f = 1kHz
–
3.0
–
kΩ
VIN(lim)
–3dB Limiting
–
40
46
dBµ
Recovered Output Voltage
VOD
VIN = 66dBµV
57
85
114
mVrms
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
VM
VIN = 100dBµV
–
1.8
–
V
Lamp ON Sensitivity
VL
IL = 1mA
–
46
52
dB
Gain
GV
VIN = 26dBµV
15
30
75
mVrms
Recovered Output Voltage
VOD
VIN = 60dBµV
65
95
125
mVrms
Signal–to–Noise Ratio
S/N
VIN = 60dBµV
–
47
–
dB
Total Harmonic Distortion
THD
VIN = 60dBµV
–
1.0
–
%
Meter Drive Voltage
VM
VIN = 100dBµV
–
1.8
–
V
Lamp ON Sensitivity
VL
IL = 1mA
–
28
–
dBµ
RDUMP = ∞
–
1.5
–
V
Supply Current
Pin5 Output Resistance
Symbol
ICC
R09
Test Conditions
FM
Input Limiting Voltage
AM
Local OSC Stop Voltage
Vstop
Pin Connection Diagram
AM Mix Input
1
16 AM Mix Output
AM Mix Bypass
2
15 FM IF Input
AM OSC
3
14 FM IF Bypass
Reg
4
13 AM IF Input
AM IF Output
5
12 AM IF Bypass
Meter Output
6
11 FM Detector
LED
7
10 VCC
GND
8
9
16
Detector Output
9
.260 (6.6) Max
1
8
.300
(7.62)
.785 (19.9)
Max
.200 (5.08)
Max
.245
(6.22)
Min
.100 (2.54)
.700 (17.7)