Product Brief
June 2000
L9218A/G Low-Cost Line Interface
Features
■Basic forward battery only SLIC functionality at a
low cost
■Pin compatible with Lucent L9219 and L9217 SLIC
■Low active power (typical 125 mW during on-hook
transmission)
■Low-power scan mode for low-power on-hook
power dissipation (55 mW typical)
■Minimal external components
■Distortion-free on-hook transmission
■Convenient operating states:
— Forward battery low current limit
— Forward battery high current limit
— Low-power scan
— Disconnect (high impedance)
■Adjustable superv ision funct i ons:
— Off-hook detector with hysteresis
— Ring trip detector
■Logic controlled high and low current limit
■Two gain options to optimize codec interface
■Thermal protection with thermal shutdown indica-
tion
Description
This general-purpose electronic subscriber loop
interface circuit (SLIC) is optimized for low cost, while
still providing a satisfactory set of features.
The L9218 is pin-for -pin co mpatibl e with the Luc ent
L9219 and L9217 SLICs.
The L9218 requires a 5 V power supply and single
battery to operate. This is a forward battery only
device. Additionally, a low-power scan mode,
wherein all circuitry except the off-hook supervision is
shut down to conserve power , is available.
Via the logic inputs, a low or high current limit may be
selected. The low value is set via a single external
resistor , and the high value is 1.4 times the low value.
Device overhead is fixed and is adequate for
3.14 dBm into 900 Ω of on-hook transmission.
Both the loop supervision and ring trip supervision
functions are offered with user-controlled threshol ds
via external resist ors.
The L9218 is offered with a receive gain that is opti-
mized for interface to a first-generation type codec
(L9218A). It is also offered with a gain option that is
optimized for interface to a third- or fourth-generation
type codec (L9218G); in both cases, minimizing
external components required at this interface. In the
receive direction, the device may be dc-coupled to a
third-generation codec; no dc blocking capacitors are
needed.
Data control is via a parallel data control scheme.
The device is available in a 28-pin PLCC package. It
is built by using a 90 V complementary bipolar
(CBIC) process.
Product Brief
June 2000
L9218A/G Low-Cost Line Interface
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 © 2000 Lucent Technologies Inc.
All Rights Reserved
Printed in U.S.A.
June 2000
PB00-072ALC (Replaces PN00-025ALC)
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
CHIN A: Micro el ectr onic s Gr oup, Lu cen t Te chn ologi es ( Chin a) Co ., Ltd., A -F2, 23/ F, Zao Fong Uni vers e Bui ldin g, 1 800 Zho ng Shan Xi Roa d, S hang hai
200233 P. R. China Tel. (86) 21 6440 0468, ext. 325, FA X (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 32 8 148
Tech ni ca l I nq uiries:GERMA NY: (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)
Application
12-3561E (F)
* Optional nonfunctional connection for exact footprint match with L9219.
RPROG
30.9 kΩ
RLCTH
24.3 kΩ
RPT
50 Ω
L7591
RPR
PT
18
1
7LCTH
8DCOUT
50 ΩPR
10
RTSP
20
RTS1
510 ΩRTSN
19
RTSN
3.4 MΩ
VRING
VBAT
CF2
11 CF1
12
CF1
0.47 µF
AGND
16 BGND
17
L9218
SLIC
CRTS1
0.015 µF
RTSP
2.94 MΩ
CF2
0.1 µF
RCVN
NSTAT
6DR2
FS
BCLK
1/4 T8536 PCM
HIGHWAY
CONTROL
AND
CLOCK
B0
B1
15
14
RCVP 5
VFRON
VFXI
VFROP
SLIC0a
SLIC3a
SLIC2a
DGND
DX1
DX2
DR1
CVDD
0.1 µF
VDD
CODEC
B2/NC 13 (OPTIONAL*) SLIC4a
22
VITR 23
TIP
RING
EMR
VBAT
9
CBAT
0.1 µF
VBAT
TXI 24
VTX 25
TG 26
CB
0.1 µF
RGP1
8.06 kΩ
CB1
0.1 µF
TXI
IPROG VCC
4
CCC
0.1 µF
VCC
