1794

NTE1794
Integrated Circuit
Volatge Controlled Amp (VCA)
for dbx Noise Reduction System
Description:
The NTE1794 is a dbx noise reduction system voltage controlled amp (VCA) in an 8–Lead SIP type
package designed for use in tape decks and other audio equipment. This device features excellent
linearity VCA for wider input level due to super low noise and a high gain NPN/PNP complementary
process.
Features:
D Wide Operating Supply Voltage
D Excellent Linearity Control Constant
D Low Total Harmonic Distortion
D Low Noise
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC, VEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Power Dissipation (TA = +75°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to 125°C
Recommended Operating Conditions:
Parameter
Operating Supply Voltage
Bias Current
Input Level Range
Symbol
Test Conditions
Min
Typ
Max
Unit
±4
±12
±15
V
ISET
–
2.0
–
mA
υin
–40
–
+10
dBV
VCC, VEE Note 1
Note 1. ISET = VEE – 4 VBE/REXT = VEE – 2.4/REXT = 2mA
Electrical Characteristics: (TA = +25°C, VCC = +12V, VEE = –12V, ISET = 2mA, f = 1kHz,
RIN = ROUT = 33kΩ unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Current
ICC
Non Signal
1.0
2.0
3.0
mA
Equivalent Input Bias Current
IIN
Non Signal
–
6
20
nA
Gain Cell Idling Current
IDLE
Non Signal
–
20
–
µA
Gain Cell Offset Voltage
VOFF
AV = 0dB, THD ≤ 0.07%
–
±0.5
–
mV
–5.8
–5.9
–6.1
mV/dB
Control Constant
VC
Total Harmonic Distortion
AV = –30dB to +30dB
THD
Output Noise Level
NV
Symmetry Control Voltage
VSYM
AV = 0dB, VO = 0dBV, BPF = 400Hz to 5kHz
–
0.007 0.07
%
AV = +20dB, VO = 0dBV, BPF = 400Hz to 5kHz
–
0.02
0.10
%
AV = –20dB, VIN = 0dBV, BPF = 400Hz to 5kHz
–
0.02
0.15
%
AV = 0dB, RIN = 33kΩ, BPF = 10Hz to 20kHz
–
–94
–84
dBV
AV = 0dB, THD ≤ 0.07%
–4
0
+4
mV
Pin Connection Diagram
(Front View)
8 Signal Output
7 VCC
6 GND
5 ISET
4 GC Bias
3 GC1
2 GC2
1 Signal Input
.118 (3.0) Max
.768 (19.52) Max
1
8
.264 (6.72)
Max
.165 (4.2)
Min
.100 (2.54) Typ
.700 (17.78)
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