NTE NTE1744 Datasheet
NTE1744
Integrated Circuit
Dual dbxII Noise Reduction System
Description:
The NTE1744 is an integrated circuit in a 22–Lead DIP type package designed for use in dbxII noise
reduction circuits for stereo applications. This device can be used for U.S. sound multiplex TV applications and low voltage operation (1.8V) allows the NTE1744 to be used in battery–operated Hi–Fi
equipment.
Features:
D Wide Dynamic Range: 110dB
D Low Operating Voltage: VCCmin = 1.8V
D Minimum Number of External Components
D Adjustment: Only One
D Low Power Consumption
D Wide Operating Voltage Range: VCC = 1.8V to 14V
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, V
Supply Current, I
Power Dissipation (TA = +75°C), P
CC
CC
D
Operating Ambient Temperature range, T
Storage Temperature Range, T
stg
opr
–20° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–55° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.4V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (TA = +25°C, VCC = 3V unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Input/Output Characteristics
ENCODE Mode V
DECODE Mode V
V
V
V
V
OE–1
OE–2
OE–3
OD–1
OD–2
OD–3
VIN = +20dB, f = 1kHz +7.5 +10.0 +12.5 dB
VIN = 0dB, f = 1kHz –2.0 0 +2.0 dB
VIN = –40dB, f = 1kHz –23 –20 –17 dB
VIN = +10dB, f = 1kHz +17 +20 +23 dB
VIN = 0dB, f = 1kHz –2.0 0 +2.0 dB
VIN = –20dB, f = 1kHz –44 –40 –36 dB
Note 1. 0dB = 20mV = –34dBV
Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 3V unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Maximum Output Voltage
ENCODE Mode V
DECODE Mode V
Total Harminic Distortion
(DECODE Mode)
Noise Output Voltage
ENCODE Mode V
DECODE Mode V
Difference Between Channels
ENCODE Mode CD
DECODE Mode CD
Crosstalk (ENCODE Mode) CT Measuring Channel: Short
Ripple Rejection Ratio (DECODE Mode) SVRR f = 60Hz, V = 100mV, Input Short 40 55 – dB
OME
OMD
THDDVO = +14dB, f = 1kHz – 0.15 0.3 %
NOE
NOD
THD = 1%, f = 1kHz 80 150 – mV
200 450 – mV
Input Short, A–weight – 100 200 µV
– 3 6 µV
VIN = 0dB, f = 1kHz – 0 1.2 dB
E
D
Another Channel: Output 200mV, f = 1kHz
– 0 1.2
50 60 – dB
Quiescent Current I
Input/Output Characteristics
dbx OFF Mode
Total Harmonic Distortion
dbx OFF Mode
Output Noise Voltage (dbx OFF Mode) Vn
Note 1. 0dB = 20mV = –34dBV
Adjust
RMS Input A
Timing A
CCA Input A
CAP1 A
VCC = 3V, Input Short – 1.8 3.2 mA
CC
V
THD
OFF
VIN = +20dB, f = 1kHz 17 20 23 dB
OFFVIN
OFF
Pin Connection Diagram
= +20dB, f = 1kHz – 0.3 1.0 %
Input Short, A–weight – 10 20 µV
1
GND
2
3
4
5
6
V
22
CC
21
N.C.
RMS Input B
20
19
Timing B
18
CCA Input B
CAP1 B
17
CAP2 A
V
AV
OUT
ON/OFF A
NI
Decode
7
8
16
15
10 13
11 12
CAP2 B
B
OUT
ON/OFF B9 14
I Time
Encode
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