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:
DWide Operating Supply Voltage
DExcellent Linearity Control Constant
DLow Total Harmonic Distortion
DLow Noise
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC, VEE 15V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Current, ICC 30mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation (TA = +75°C), PD330mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, Topr –20° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, Tstg –40° to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions:
Parameter Symbol Test Conditions Min Typ Max Unit
Operating Supply Voltage VCC, VEE Note 1 ±4±12 ±15 V
Bias Current ISET – 2.0 – mA
Input Level Range υin –40 – +10 dBV
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
Control Constant VCAV = –30dB to +30dB –5.8 –5.9 –6.1 mV/dB
Total Harmonic Distortion THD 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 %
Output Noise Level NV AV = 0dB, RIN = 33kΩ, BPF = 10Hz to 20kHz – –94 –84 dBV
Symmetry Control Voltage VSYM AV = 0dB, THD ≤ 0.07% –4 0 +4 mV
GC2
GC1
ISET
VCC
Pin Connection Diagram
(Front View)
Signal Input
GND
Signal Output
GC Bias
8
7
6
5
4
3
2
1
.768 (19.52) Max .118 (3.0) Max
18
.700 (17.78)
.100 (2.54) Typ
.165 (4.2)
Min
.264 (6.72)
Max
