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AS2540Q Datasheet(PDF) 3 Page - ams AG |
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AS2540Q Datasheet(HTML) 3 Page - ams AG |
3 / 19 page Data Sheet AS2540 austriamicrosystems Revision 3.1 Page 2 of 18 Pin Description Pin # Symbol Function 15 RFD Ring Frequency Discrimination Schmitt trigger input for ring frequency discrimination. Disabled during off-hook. 7LS Line Current Sense Input Input for sensing the line current 5LI Line Input Input used for power extraction and line current sensing 6RI Receive Input Input for ac-separated receive signal 2STB Side Tone Balance Input Input for side tone cancellation network 3CS Current Shunt Control Output N-channel open drain output to control the external high power shunt transistor for synthesising ac- and dc- impedance, modulation of line voltage and shorting the line during make periods of pulse dialling 8CI Complex Impedance Input Input pin for the capacitor to program a complex impedance 16 DPn Dial Pulse Output Open drain output pulls low during break periods of pulse dialling and flash 17 EHS Electronic Hook Switch Schmitt Trigger Input to detect an electronic off-hook. 18 MHS Manual Hook Switch Schmitt Trigger Input to detect a manual off-hook. 19 MODE DTMF Level Selection -4/-6dBm —> DLS open -6/-8dBm —> DLS-r1 -8/-10dBm —> DLS-r2 Line Loss Compensation Select Pin 45mA-75mA —> LLC open 20mA-50mA —> LLC-r3 None —> LLC-r4 28 MO Ring Melody Output PDM output of the ring melody generator. 11 VDD Voltage Drain Drain Positive Power Supply 4 VSS Voltage Source Source Negative Power Supply |
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