NTE1439 Integrated Circuit Dual Attenuator Description: The NTE1439 is an integrated circuit in a 14–Lead DIP type package which logarithmically controls the throughput (gain) of an audio signal by the DC voltage or resistance value and has 2 circuits. Since voltage is internally stabilized, the stable operations are assured at the allowable supply voltage range (8V to 14.4V). The current source is provided with control circuit so that operation can be controlled by the voltage drop. This device is used for electronic volume control in radio, television, stereo, tape recorder, an transceiver applications. Features: D Wide Operating Voltage Range D High Attenuation Level D Easy to Control Signal Gain with a Simple Circuit D Less Crosstalk Between Each Channel Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V Circuit Voltage (Note 1), V6, V13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V Circuit Voltage, V3, V10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC Total Current Dissipation, Itot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA Total Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360mW Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Note 1. DC voltage must not be applied to Pin1, Pin2, Pin8, and Pin9 from the outside. 6V is used as voltage for V6 and V13 and no larger than VCC voltage. Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Gain Gain Ratio (Ch2/Ch1) Symbol Test Conditions Min Typ Max Unit GV1 vi = 100mV, Vcont = 5V, f = 1kHz 11.7 – 15.7 dB GV2 vi = 100mV, Vcont = 4V, f = 1kHz 10.5 – 15.0 dB GV3 vi = 100mV, Vcont = 3V, f = 1kHz –14 – 2 dB GV3(2)/GV3(1) vi = 100mV, Vcont = 3V, f = 1kHz –6 – +6 dB Note 2. The same measurement should be applied for Ch2. Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Residual Noise vO vi = 100mV, VC = 1V, f = 1kHz, B = 20kHz – – 100 µV Noise vN vi = 0V, VC = 3.5V, B = 20kHz – – 150 µV Crosstalk CT vi = 500mV, VC = 5V, f = 1kHz 60 – – dB Output DC Voltage VO VC = 5V 5.7 – 8.2 V Output Voltage Fluctuation ∆VO VC = 5V to 0V –0.65 – +0.65 V Control Input Current –Icont Rcont = 0 Ω 0.15 – 0.33 mA Rcont = 20kΩ 0.15 – 0.33 mA VC = 5V – – 22 mA vi = 100mV, VC = 5V, f = 1kHz – – 0.5 % I6, I13 = 10µA 6 – – V Supply Current ICC Distortion Factor THD D6 Breakdown V(BR)D Note 2. The same measurement should be applied for Ch2. Pin Connection Diagram Ch 1 Input 1 14 N.C. Ch 1 Equalize 2 13 Ch 1 Control Ch 1 Output 3 12 Ch 1 VCC GND 4 11 N.C. Ch 2 VCC 5 10 Ch 2 Output 6 9 Ch 2 Equalize N.C. 7 8 Ch 2 Input Ch 2 Control 14 8 1 7 .300 (7.62) .785 (19.95) Max .200 (5.08) Max .100 (2.45) .600 (15.24) .099 (2.5) Min