KA8503 network equivalent, low voltage speech network.
* Adjust Sending and Receiving Attenuation Length
* Mute Function
* Side Tone Balance Network Constitution
* Low Voltage Operating
* AC Impedance Matc.
Pin No 1 2 3 4 5 6 7, 8, 9 10 11 12, 13 14 15 16 17, 18 Symbol V+ TXO TXI VDD MUTE GR ST1, ST2, ST3 STO MIC0 MIC1, MIC2 VRXI RXO1 RXO2, ROX3 Seperate amplifier output. Microphone amplifier output. Microphone amplifier inputs. Input impedance is 1.7 K.
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