NTE1801
Integrated Circuit
TV dbx Noise Reduction System
Description:
The NTE1801 Multiplexed Sound dbx Noise Reduction Decoder is a singlechip linear IC in a
28Lead DIP type package suitable for US NTSC System use. The device incorporates two RMS
level sensors and VCA circuits, as well as five operational amplifiers and two buffer circuits.
A complete multiplexed sound system for US NTSC System television sets can be built by interfacing
the NTE1801 with the NTE1800 Multiplexed Sound Decoder.
Features:
D
Low Distortion Ratio, Low Interference
D
Low Power Supply Current
D
Single, 8V to 15V Power Supply
D
100mV
rms
(300Hz, 0dB) Input Voltage (Pin4)
D
Easily Interfaced to the NTE1800
Functions:
D
OnChip dbx Noise Reduction Decoder and VCA Circuits
D
OnChip RMS Level Sensor
D
L + R Signal Buffer Amplifier
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Supply Voltage, V
CC
max
15V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation (T
A
= +75
C), P
D
580mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
20
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
40
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions: (T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Power Supply Voltage
V
CC
8.0
12.0
13.5
V
Input Signal Voltage
V
IN
f = 300Hz, Pin4
100
mV
rms
Amp 1 Gain
AV1
0
10.3
30.0
dB
Amp 2 Gain
AV2
0
20
dB
Operating Characteristics: (T
A
= +25
C, V
CC
= 12V, 0dB = 100mV
rms
unless otherwise specified)
Parameter
Symbol
Test Conditions
Notes
Min
Typ
Max
Unit
Circuit Current
I
CC
No Signal
8.0
12.5
17.0
mA
Output Voltage
V
O1
f = 300Hz, V
IN
= +10dB
(LR)
+17
+20
+23
dB
V
O2
f = 300Hz, V
IN
= 0dB
(LR)
3
0
+3
dB
V
O3
f = 300Hz, V
IN
= 20dB
(LR)
43
40
37
dB
V
O4
f = 8kHz, V
IN
= +17dB
(LR)
+12.1 +15.1 +18.1
dB
V
O5
f = 8kHz, V
IN
= +7dB
(LR)
14.6 11.6
8.6
dB
V
O6
f = 8kHz, V
IN
= 3dB
(LR)
43.6 40.6 37.6
dB
V
O7
f = 1kHz, V
IN
= 215mV
(L+R)
0.5
0
+0.5
dB
Maximum Output Voltage
V
OM
f = 1kHz, THD = 1%,
(400 to 300kHz using BPF)
(LR)
4.0
8.6
V
PP
Total Harmonic Distortion
THD1
V
O
= 0dB, f = 1kHz,
(400 to 300kHz using BPF)
(LR)
0.1
0.5
%
THD2
V
O
= 215mV, f = 1kHz,
(400 to 300kHz using BPF)
(L+R)
0.1
0.3
%
Output Noise Voltage
NL1
R
g
= 0, 400 to 30kHz using BPF
(LR)
96
90
dBV
NL2
(L+R)
90
70
dBV
Reference Voltage
V
ref
V
CC
= 12V
5.8
6.0
6.2
V
Caution: Static Electricity can impair the performance of this device.
V
CC
Pin Connection Diagram
Buffer Output
Capacitor
GND
Input (Amp 3)
Buffer Input
Preamp Output
Resistor Adjust
VCA1 Input
Buffer Input
VCA1 Adjust
Capacitor
NonInvert Input (Amp 5)
N.C.
N.C.
1
2
3
4
NonInvert Input (Amp 1)
Invert Input (Amp 1)
5
6
Buffer Output
7
RMS Detector 1 Input
8
28
27
26
25
Reference Voltage
24
23
22
21
9
RMS Detector 2 Input
20
Output (Amp 3)
VCA2 Input
10
Capacitor
11
19
18
Input (Amp 4)
12
17
LR/SAP Output
13
Invert Input (Amp 5)
16
14
15
L+R Output
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