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LUCL9214GAU-DT Datasheet(PDF) 11 Page - Agere Systems |
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LUCL9214GAU-DT Datasheet(HTML) 11 Page - Agere Systems |
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11 / 46 page  Preliminary Data Sheet October 2001 Low-Cost Ringing SLIC L9214A/G Agere Systems Inc. 11 Pin Information (continued) Table 1. Pin Descriptions (continued) 28-Pin SOG 32-Pin PLCC 48-Pin MLCC Symbol Type Name/Function 16 20 23 TRGDET O Tip/Ring Ground Detect. When high, this open collector output indicates the presence of a ring ground or a tip ground. This supervision output may be used in ground key or common-mode fault detection applications. 17 21 24 ICM I Common-Mode Current Sense. To program tip or ring ground sense threshold, connect a resistor to VCC and connect a capacitor to AGND to filter 50/60 Hz. If unused, the pin is connected to ground. 18 22 25 FB2 — Polarity Reversal Slowdown Capacitor. Connect a capacitor from this node for controlling rate of battery reversal. Also used for ringing, this pin cannot be left open. 19 23 26 FB1 — Polarity Reversal Slowdown Capacitor. Connect a capacitor from this node for controlling rate of battery reversal. Also used for ringing, this pin cannot be left open. 20 24 29 PT I/O Protected Tip. The input to the loop sensing circuit and output drive of the tip amplifier. Connect to loop through overvoltage and overcurrent protection. 21 25 31 PR I/O Protected Ring. The input to the loop sensing circuit and output drive of the ring amplifier. Connect to loop through overvoltage and overcurrent protection. 22 26 33 B3 I State Control Input. 23 27 34 B2 I State Control Input. 24 28 35 B1 I State Control Input. 25 29 36 B0 I State Control Input. 26 30 38 ITR I Transmit Gain. Input to AX amplifier. Connect a resistor from this node to VTX to set transmit gain. Gain shaping for termination impedance with a COMBO I codec is also achieved with a network from this node to VTX. 27 31 40 VTX O ac/dc Output Voltage. Output of internal AX amplifier. The voltage at this pin is directly proportional to the differ- ential tip/ring current. 28 32 41 TXI I ac/dc Separation. Input to internal AAC amplifier. Con- nect a 0.1 µF capacitor from this pin to VTX. |
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