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LUCL9214GAU-DT Datasheet(PDF) 1 Page - Agere Systems |
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LUCL9214GAU-DT Datasheet(HTML) 1 Page - Agere Systems |
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1 / 46 page  Preliminary Data Sheet October 2001 L9214A/G Low-Cost Ringing SLIC Introduction The Agere Systems Inc. L9214 is a subscriber line interface circuit that is optimized to provide a very low-cost solution for short- and medium-loop applica- tions. This device provides the complete set of line interface functionality, including power ringing needed to interface to a subscriber loop. This device has the capability to operate with a VCC supply of 3.3 V or 5 V and is designed to minimize external components required at all device interfaces. Features s Low-cost solution s Onboard ringing generation with software adjust- able crest factor switching s Flexible VCC options: — 3.3 V or 5 V VCC — No –5 V required s Power control options: — Power control resistor — Automatic battery switch to minimize off-hook power s Eight operating states: — Scan mode for minimal power dissipation — Forward and reverse battery active — On-hook transmission states — Ring mode — Disconnect mode s Low on-hook power: — 25 mW scan mode — 165 mW active mode s Two SLIC gain options to minimize external com- ponents in codec interface s Loop start, ring trip, and ground key detectors s Programmable current limit s On-hook and scan mode line voltage clamp s Thermal protection s 48-pin MLCC, 32-pin PLCC, and 28-pin SOG (Please contact your Agere Sales Representative for availability) packages Applications s Voice over Internet Protocol (VoIP) s Cable Modems s Terminal Adapters (TA) s Wireless Local Loop (WLL) s Telcordia Technologies ™ GR-909 Access s Network Termination (NT) s PBX s Key Systems Description This device is optimized to provide battery feed, ring- ing, and supervision on short- and medium-loop plain old telephone service (POTS) loops. Supported round trip loop length is up to 1000 Ω. This device provides power ring to the subscriber by the use of line reversal to create either a sine wave ringing signal with a PWM input or a trapezoidal ring- ing signal with a selectable crest factor from a square wave input. It provides forward and reverse battery feed states, on-hook transmission, a low-power scan state, and a forward disconnect state. The device requires a VCC and line feed battery to operate. VCC may be either a 3.3 V or a 5 V supply. The ringing signal is derived from the high-voltage battery. An automatic battery switch is included to allow for use of a second lower voltage battery in the off-hook mode, thus minimizing short-loop off-hook power consumption and dissipation. If the user desires single battery operation, a power resistor is required to reduce the power dissipation in the SLIC. Loop closure, ring trip, and ground key detectors are available. The loop closure detector has a fixed threshold with hysteresis. The ring trip detector and ground key detector threshold and time constants are externally set. The dc current limit is programmed by an external resistor, the maximum current limit determined by the Vcc supply. The overhead voltage for this device is fixed and the device is capable of supporting 3.17 dB into a 600 Ω load with minimal overhead. The device is offered with two gain options. This allows for an optimized codec interface, with minimal external components regardless of whether a first- generation or a programmable third-generation codec is used. |
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