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AS2521T Datasheet(PDF) 2 Page - ams AG |
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AS2521T Datasheet(HTML) 2 Page - ams AG |
2 / 14 page Preliminary AS2520/21/20B/21B Rev. 5.1 Page 2 May 1999 Pin Description Pin # Name Type Description 1 LS AI Line Current Sense Input This input is used for sensing the line current. 2 CI AI Complex Impedance Input Input pin for the capacitor in the complex impedance. 3 RO AO Receive Output This is the output for driving a dynamic earpiece with an impedance of 140 to 300 ohm. 4 V DD Supply Positive Voltage Supply This is the supply pin for the circuit. 5 A GND Supply Analogue Ground This pin is the analogue ground for the amplifiers. 6 STB AI Side Tone Balance Input This is the input for the side tone cancellation network. 7 LLC DI Line Loss Compensation Selection Pin LLC = V DD: High range -6 dB from 45 mA to 75 mA; LLC = A GND: Low range -6 dB from 20 mA to 50 mA; LLC = V SS: No regulation gain independent of line current; 8 LSI AO Loudspeaker Amplifier Input This is the input for applying the receive signal to the loudspeaker amplifier. 9 TI AI DI Tone Input This switchable input is intended for transmitting DTMF or other signals like messages on TAMs (Telephone Answering Machines) onto the line in off-hook conditions and when in ringing mode to apply a PDM signal to the loudspeaker (see also table 1). 10 RTH AI Receive Threshold Input The sensibility of the receive peak detector can be adjusted by applying the signal from RO to the RTH input through a voltage divider. 11 CM AO Converter Make Output This is an output for controlling the external switching converter. It converts the ring signal into a 4V supply voltage and is activated when PD = high and HS, LE, MT = low. 12 V PP Supply Loudspeaker Power Supply High power supply for the output driver stage. 13 LO AO Output for Loudspeaker Output pin for an ac coupled 32 Ω (25 to 50 Ω)loudspeaker. 14 V SSP Supply Negative High Power Supply This pin is the negative high power supply for the loudspeaker amplifier. 15 MT DI Mute Input Dialling mute input (see also table 1). MT = V DD: Tx and Rx channels muted; MT = V SS: Tx and Rx channels not muted. 16 PD DI Power Down Input Input for powering down the speech circuit and loudhearing/handsfree (see table 1). 17 LE DI Loudhearing Enable Input Input for enabling loudhearing/handsfree, active high (see table 1). 18 HS DI Handset Switch Input This is an input that is pulled high by the hook switch (handset) or µC when off-hook (see table 1). |
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Similar Description - AS2521T |
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