Product Brief June 2000 L9214A/G Low-Cost Ringing SLIC Introduction Applications The L9214 is a subscriber line interface circuit that is optimized to provide a very low-cost solution for short- and medium-loop applications. 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 Low-cost solution Onboard ringing generation with software adjustable crest factor switching Flexible VCC options -- 3.3 V or 5 V VCC -- No -5 V required Power control options -- Power control resistor -- Automatic battery switch to minimize off-hook power Eight operating states -- Scan mode for minimal power dissipation -- Forward and reverse battery active -- On-hook transmission states -- Ring mode -- Disconnect mode Low on-hook power -- 25 mW scan mode -- 165 mW active mode Two SLIC gain options to minimize external components in codec interface Loop start, ring trip, and ground key detectors Programmable current limit On-hook and scan mode line voltage clamp Thermal protection 28-pin SOG and 32-pin PLCC packages Voice over Internet Protocol (VoIP) Cable Modems Terminal Adapters (TA) Wireless Local Loop (WLL) Network Termination (NT) PBX Key Systems Description This device is optimized to provide battery feed, ringing, and supervision on short- and medium-loop plain old telephone service (POTS) loops. Supported round trip loop length is up to 1000 . 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 ringing 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 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 firstgeneration or a programmable third-generation codec is used. L9214A/G Low-Cost Ringing SLIC Product Brief June 2000 L9214 Architecture Diagram AGND BGND VBAT2 VCC VBAT1 IREF VITR POWER/BATTERY SWITCH IPROG NSTAT CURRENT LIMIT AND INRUSH CONTROL TXI DCOUT RING TRIP X20 AAC RTFLT LOOP CLOSURE REFERENCE CIRCUIT VTX ITR COMMONMODE CURRENT DETECTOR RECTIFIER ICM TRGDET - VTX (ITR/308) AX X1 CF2 X1 CF1 + PT ITR RFT - 18 + TIP/RING CURRENT SENSE ITR PR FB2 FB1 VBAT1 VBAT2 RFR + 18 - - GAIN + RCVN RCVP ac INTERFACE 9214A GAIN = 4 VBAT1 VBAT2 PARALLEL DATA INTERFACE B0 B1 B2 9214G GAIN = 1 B3 12-3530.C (F) For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P. R. China Tel. (86) 21 6440 0468, ext. 325, FAX (86) 21 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot), FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid) Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. Copyright (c) 2000 Lucent Technologies Inc. All Rights Reserved June 2000 PB00-024ALC