NX-300TERMINAL FUNCTION57Pin No. Name I/O Signal Type Rating and ConditionParameter Min Typ Max UnitOutput Amplitude (1kHz, 60% deviation)while external MIC 160 260 360 mVp-p21 TXO O Analog while internal MIC - 130 - mVp-pCoupling Capacitor - 0.1 - uFOutput Impedance - - 2.2k ΩAllowable Frequency 300 3000 HzOutput Amplitude (1kHz, 60% deviation) 450 640 830 mVp-p22 RXEO O Analog Coupling Capacitor - 0.1 - uFOutput Impedance - - 2.2k ΩAllowable Frequency 300 - 3000 HzInput Amplitude (1kHz, 60% deviation) 450 640 830 mVp-p23 RXEI I Analog Coupling Capacitor 0.1 uFInput Impedance 22k ΩAllowable Frequency 300 3000 HzInput Amplitude (1kHz, 60% deviation)while external MIC 160 260 360 mVp-p24 TXI I Analog while internal MIC - 130 - mVp-pCoupling Capacitor - 0.1 - uFInput Impedance 22k - - ΩAllowable Frequency 300 - 3000 Hz14 5V O Power Output Voltage 5 VOutput Current 78 mA26 POW O Power Output Voltage 7.5 VOutput Current 100 mA9 Allowable current value10 AGND - GND (Total current of 3 pins) 100 mA135 NC - - -