Product Brief October 2000 L9216A/G Short-Loop Ringing SLIC with Ground Start Introduction The L9216 is a subscriber line interface circuit (SLIC) that is optimized for short-loop, power sensitive 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 Onboard ringing generation Three ringing input options -- Sinewave -- PWM -- Logic level squarewave Flexible VCC options -- 5 V or 3.3 V VCC -- No -5 V required Battery switch to minimize off-hook power 8 operating states -- Scan mode for minimal power dissipation -- Forward and reverse battery active -- On-hook transmission states -- Ground Start -- Ring mode -- Disconnect mode Ultralow on-hook power -- 27 mW scan mode -- 41 mW active mode Two SLIC gain options to minimal external components in codec interface Loop start, ring trip, and ground start detectors Software controllable dual current limit option 28-pin PLCC package Terminal Adapters (TA) Wireless Local Loop (WLL) Telcordia Technologies* TA-909 Access Network Termination (NT) Key Systems Description This device is optimized to provide battery feed, ringing, and supervision on short-loop plain old telephone service (POTS) loops. Supported loop length is less than 250 of wire. This device provides power ring to the subscriber loop through amplification of a low-voltage input. It provides forward and reverse battery feed states, onhook transmission, a low-power scan state, ground start (tip open), and a forward disconnect state. The device requires a VCC and battery to operate. VCC may be either a 5 V or a 3.3 V supply. The ringing signal is derived from the high-voltage battery. A battery switch is included to allow for use of a lowervoltage battery in the off-hook mode, thus minimizing short-loop off-hook power. Loop closure, ring trip, and ground start detectors are available. The loop closure detector has a fixed threshold with hysteresis. The ring trip detector requires a single-pole filter, thus minimizing external components required. The dc current limit is set and fixed by a logic controllable pin. Ground or Vcc applied to this pin set the current limit at the high or low value. 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. Applications Voice over Internet Protocol (VoIP) Cable Modems * Telcordia Technologies is a registered trademark of Bell Communications Research, Inc. L9216A/G Short-Loop Ringing SLIC with Ground Start Product Brief October 2000 Architecture Diagram AGND VCC BGND VBAT2 VBAT1 VPROG VREF VITR NSTAT CURRENT LIMIT AND INRUSH CONTROL POWER B = 20 RTFLT DCOUT RING TRIP LOOP CLOSURE AAC TXI 1.5 V BAND-GAP REFERENCE VTX ITR COMMONMODE CURRENT DETECTOR RECTIFIER ICM RGDET - VTX OUT AX + (ITR/306) VREF ITR 18 TIP/RING CURRENT SENSE ITR PR X1 CF1 +1 + VREG FB2 FB1 + RFR 18 CF2 - RFT PT X1 -1 - GAIN RCVN + RCVP ac INTERFACE - 9216A GAIN = 4 VREG 9216G GAIN = 1 PARALLEL DATA INTERFACE RINGING 27.5x RINGIN B0 B1 B2 12-3530.E (F) Figure 1. Architecture Diagram RCVN RCVP VITR NSTAT TXI VTX ITR Pin Information 4 3 2 1 28 27 26 25 RINGIN 5 B0 DCOUT 6 24 B1 VPROG 7 23 B2 22 PR L9216 28-PIN PLCC 10 20 FB1 19 18 FB2 RTFLT 11 12 AGND VREF 13 14 15 16 17 ICM PT RGDET 21 BGND 9 VBAT2 CF1 VBAT1 8 VCC CF2 12-3558.d (F) Figure 2. 28-Pin PLCC Lucent Technologies Inc. 2 L9216A/G Short-Loop Ringing SLIC with Ground Start Product Brief October 2000 Applications VBAT1 DBAT1 VBAT2 VCC CBAT1 CBAT2 CCC 0.1 F 0.1 F 0.1 F VBAT1 BGND VBAT2 VCC AGND ICM CRT 0.1 F RRT 383 k RGDET ITR ground key not used RTFLT RGX 4640 VTX CTX 0.1 F DCOUT FUSIBLE OR PTC VBAT2 TXI PR 50 CC1 0.1 F LUCENT L7591 50 VFXI VITR L9216G DX0 DR0 PT FUSIBLE OR PTC RCVP VFROP RCVN VFRON rate of battery reversal not ramped CF1 CF2 FB1 FB2 FS NSTAT B2 B1 B0 RINGIN CF1 0.47 F CF2 0.1 F FROM/TO CONTROL CRING 0.47 F PCM HIGHWAY DR1 VPROG VREF DX1 B2 SLIC4a B1 SLIC3a B0 SLIC2a DGND NSTAT SLIC0a BCLK VDD SYNC AND CLOCK VDD 12-3534.J (F) Figure 3. Third-Generation Codec ac Interface Network; Complex Termination 3 Lucent Technologies Inc. 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 3507670 (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) 200 0 Lucent Technologies Inc. All Rights Reserved October 2000 PB00-138ALC