NTE1660 Integrated Circuit Audio Preamplifier Features: D High Open−Loop Voltage Gain: 80dB Typ D High Input Impedance: 200kΩ Typ D Low Noise: 0.9µV Typ (Rg = 2.4kΩ, converted into input voltage) Absolute Maximum Ratings: (TA = +25°C) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Power Dissipation, PT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30° to +80°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +125°C Electrical Characteristics: (TA = +25°C, VCC = 9V, f = 1kHz, RL = 5.1kΩ unless otherwise specified) Parameter Quiescent Current Open−Loop Voltage Gain Symbol Test Conditions IQ GV(OL) Vout = −10dBm Min Typ Max Unit 0.8 1.3 1.7 mA 75 80 − dB − 53.5 − dB 0.7 − − V Voltage Gain GV Output Voltage Vout THD = 1% Total Harmonic Distortion THD Vout = 0.3%, f = 1kHz − 0.25 − % Input Impedance Zin f = 1kHz 70 − − kΩ Noise Voltage Converted into Input Vn Rg = 2.4kΩ, Note 1 − 0.9 2.2 µV Note 1. Value converted into output noise voltage is 43mV Typ and 106mV Max. Pin Connection Diagram (Front View) 8 VCC 7 Output 6 Bypass 5 GND 4 Feedback 3 Input 2 No Pin 1 Preamp Load Resistor .756 (19.2) .362 (9.19) Max .142 (3.6) .237 (6.02) 1 8 .100 (2.54) .700 (17.78) .099 (2.51) Min