1056

NTE1056
Integrated Circuit
FM Stereo Multiplex Demodulator
Description:
The NTE1056 is a monolithic integrated circuit FM multiplex stereo demodulator designed for use in
FM stereos, phonographs and radio receivers. A multiplex stereo demodulator circuit generally consists of four main circuits, a composite signal amplifier, 19KHz pilot signal filter, 38KHz subcarrier generator and either a matrix or a switching circuit which seperates the composite signal into the right
and left audio channels. In addition to these circuits, an automatic stereo−monaural switching circuit,
stereo signal indicator circuit, muting circuit, separation control circuit and SCA circuit are also included as supplemental circuits. The NTE 1056 is designed to include both main stereo demodulator
circuits and supplemental circuits on a common monolithic substrate, and is supplied in a 14 lead DIP.
Features:
D Separation Control
D On, Off Level Control
D Monoaural Muting
D Either Positive or Negative Grounding are Available
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, V2−12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Total Current Consumption, Itot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
Total Power Dissipation (TA ≤ 75°C), PT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C
Electrical Characteristics: (TA = +25°C, VCC = 9V, unless otherwise specified)
Parameter
Symbol
Supply Voltage
V2−12
Circuit Current
Stereo
Itot
Test Conditions
VIN = 300mV
Monoaural
Channel Seperation
f = 1kHz
VIN = 300mV
f = 10kHz
Channel Balance
Voltage Gain
ch. B
GV
VIN = 300mV
Min
Typ
Max
Unit
6
9
12
V
6
9
13
mA
6
9
13
mA
35
45
−
dB
25
29
−
dB
−
−
2
dB
−2.5 −1.5 −0.5
dB
Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 9V, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
−
3.8
−
kΩ
I10−12 = 100µA
Resistance
V10−12
Collector−Base Voltage (T1)
V13−14
18
30
−
V
V1−2
5
−
−
V
Emitter−Base Voltage (T2)
Pin Connection Diagram
(Front View)
1
14
Amp Input
2
13
Amp Output
3
12
GND
4
11
Bias Adjust
38kHz Decoder
5
10
Mono/Stereo Switch
Input
6
9
Decoder Input
Output
7
8
Output
19kHz Tank
VCC
38kHz Tank
DC Amp/
Lamp Driver
14
8
1
7
.785 (19.95)
Max
.300
(7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min