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)