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L9215A Datasheet(PDF) 10 Page - Agere Systems |
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L9215A Datasheet(HTML) 10 Page - Agere Systems |
10 / 50 page Data Sheet September 2001 Short-Loop Sine Wave Ringing SLIC L9215A/G 10 Agere Systems Inc. Pin Information (continued) Table 1. Pin Descriptions (continued) 32-Pin PLCC 48-Pin MLCC Symbol Type Name/Function 15 15 AGND GND Analog Signal Ground. 16 16 VCC PWR Analog Power Supply. User choice of 5 V or 3.3 V nominal power or sup- ply. 17 19 VBAT1 PWR Battery Supply 1. High-voltage battery. 18 20 VBAT2 PWR Battery Supply 2. Lower-voltage battery. 19 22 BGND GND Battery Ground. Ground return for the battery supplies. 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. 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 fil- ter 50/60 Hz. If unused, the pin is connected to ground. 22 25 FB2 — Polarity Reversal Slowdown Capacitor. Connect a capacitor from this node for controlling rate of battery reversal. If ramped battery reversal is not desired, this pin is left open. 23 26 FB1 — Polarity Reversal Slowdown Capacitor. Connect a capacitor from this node for controlling rate of battery reversal. If ramped battery reversal is not desired, this pin is left open. 24 29 PT I/O Protected Tip. The output drive of the tip amplifier and input to the loop sensing circuit. Connect to loop through overvoltage and overcurrent pro- tection. 25 31 PR I/O Protected Ring. The output drive of the ring amplifier and input to the loop sensing circuit. Connect to loop through overvoltage and overcurrent pro- tection. 26 33 B2 Iu State Control Input. These pins have an internal 60 k Ω pull-up. 27 34 B1 28 35 B0 29 36 BR 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. 31 40 VTX O ac Output Voltage. Output of internal AX amplifier. The voltage at this pin is directly proportional to the differential tip/ring current. 32 41 TXI I ac/dc Separation. Input to internal AAC amplifier. Connect a 0.1 µF capac- itor from this pin to VTX. |
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