NTE1223 Integrated Circuit Low Noise High Gain Pre−Amplifier Circuit For General Purpose Audio Pre−Amplifiers Features: D External initial stage emitter resistor which determines feedback voltage gain and assures better temperature characteristics. Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Power Dissipation (TA ≤ 75°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mW Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +125°C Electrical Characteristics: (VCC = 9V, f = 1kHz, TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit − 1.3 2.3 mA Total Circuit Current Itot Closed Circuit Voltage Gain Gvo Vi = 0.1mV 75 80 − dB Output Voltage (AC) Vo THD = 1% 1.5 2 − Vrms THD VO= 0.3V − 0.07 0.2 % − 130 − kΩ − 0.8 1.5 µVrms Total Harmonic Distortion Input Resistance Ri Input Referred Noise Voltage Vni Rg = 2.2kΩ Pin Connection Diagram (Front View) 7 VCC 6 Output 5 Bypass 4 GND 3 Feedback 2 Input 1 Equalization .118 (3.0) .728 (18.5) Max .248 (6.3 Max .095 (2.42) 1 7 .118 (3.0) Min .100 (2.54) .600 (15.24) .012 (0.32)