NTE1497 Integrated Circuit Audio Preamp w/ALC Description: The NTE1497 is a silicon monolithic integrated circuit in a 7−Lead SIP type package designed for use as a high gain, low noise preamplifier with Automatic Level Control (ALC). This device is primarily used as a record and playback amplifier in cassette tape recorders. Features: D Low Noise D Wide Supply Voltage Range: VCC = 2.2V to 15V D High Gain: Aνo = 70dB Typ D High Output Voltage: VOM = 1.0 Vrms Typ. D Low Distortion D Wide ALC Range Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Package Dissipation (TA = 75°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270mW Operating Temperature, Topt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20° to +75°C Storage Temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +125°C Recommended Operating Conditions: (TA = +25°C unless otherwise specified) Operating Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2V to 15V Electrical Characteristics: (TA = +25°C, VCC = 5V, f = 1kHz, RL = 10kΩ unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Circuit Current ICC νin = 0 0.9 1.5 2.2 mA Open Loop Voltage Gain Aνo νin = −80dBm 64 70 − dB Voltage Gain Aν νin = −50dBm − 33.5 − dB VOM T.H.D. = 1% 0.7 1.0 − V f = 1kHz − 100 − kΩ RG = 2.2kΩ, NAB Equalized 15 to 30kHz BPF + 40dB Amp − 1.2 2.0 μVrms Pin7 to Pin6: 100kΩ, Pin7 to Pin5: 100Ω − 0.7 − V Maximum Output Voltage Input Impedance Equivalent Input Noise Voltage Collector Voltage of ALC Transistor ri νnin VPin5 Pin Connection Diagram (Front View) 7 VCC 6 ALC Input 5 ALC Output 4 GND 3 Output 2 N.F.B 1 Input .119 (3.02) .264 (6.7) Max .015 (0.381) .768 (19.5) Max 1 7 .100 (2.54) .600 (15.24) .465 (11.81 Min