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AS2535 Datasheet(PDF) 2 Page - ams AG |
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AS2535 Datasheet(HTML) 2 Page - ams AG |
2 / 25 page 2 Rev. 7 July 1998 Data Sheet AS2533...6 Pin Description Pin # Symbol Function 23 M1 Microphone Inputs 24 M2 Differential inputs for the microphone (electret). 3RO Receive Output This is the output for driving a dynamic earpiece with an impedance of 140 to 300 Ω. 5A GND Analogue Ground This is the analogue ground for the amplifiers. 28 RI Receive Input This is the input for the receive signal. 6 STB Side Tone Balance Input This is the input for side tone cancellation. 1LS Line Current Sense Input This is the input for sensing the line current. 27 LI Line Input This input is used for power extraction and line current sensing. 25 CS Current Shunt Control Output This N-channel open drain output controls the external high power shunt transistor for the modulation of the line voltage and for shorting the line during make period of pulse dialling. 4V DD Positive Voltage Supply This is the supply pin for the circuit. 26 V SS Negative Power Supply 8MO Melody Output PDM output of the melody generator for tone ringing. Hi-Z when not active. 21 FCI Frequency Comparator Input This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook. 10 HS/DP Hook Switch Input and Dial Pulse Output This is an I/O that is pulled high by the hook switch when off-hook and an open drain pulls it low during break periods of pulse dialling and flash. 11 OSC Oscillator Input Pin for ceramic resonator (3.58 MHz). Recommended: Murata CSA 3.58MG312AM. 9 LLC Line Loss Compensation Select pin for line loss compensation (see also figure 4 to 7). LLC = A GND: 20 - 50 mA LLC = V DD: 45 - 75 mA LLC = V SS: none. 22 LED LED Output Driver Output for driving an LED that will be flashing when in Programme/Mute state. Continues… |
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