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 appli-
cations. 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 act ive mod e
■Two SLIC gain options to minimal external compo-
nents in codec interface
■Loop start, ring trip, and ground start detectors
■Software co ntr ol lab le dua l curr ent li mit option
■28-pin PLCC package
Applications
■Voice over Internet Protocol (VoIP)
■Cable Modems
■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, ring-
ing, and supervision on short-loop plain old tele-
phone service (POTS) loops. Supported loop length
is less than 250 Ω 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, on-
hook transmission, a low-power scan state, ground
start (tip open), and a forward disconnect state.
The device re quire s a VCC and battery to operate.
VCC may be either a 5 V or a 3.3 V supply. The ring-
ing signal is derived from the high-voltage battery. A
battery switch is included to allow for use of a lower-
voltage 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 control-
lable 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 first-
generation or a programmable third-generation
codec is used.
*
Telcordia Technologies
is a registered trademark of Bell Commu-
nications Research, Inc.
Product Brief
October 2000 Short-Loop Ringing SLIC with Ground Start
L9216A/G
Lucent Technologies Inc. 2
Architecture Diagram
12-3530.E (F)
Figure 1. Architecture Diagram
Pin Information
12-3558.d (F)
Figure 2. 28-Pin PLCC
VREF
VITR
TXI
ITR
VTX
PT
PR
ICM
RGDET
CF2
CF1
FB2
FB1
POWER
AGND VCC BGND VBAT2 VBAT1 VPROG NSTAT RTFLT DCOUT
1.5 V
BAND-GAP
REFERENCE
AAC
B = 20
OUT (ITR/306)
TIP/RING
CURRENT
SENSE
+1
ITR
ITR
RFT
18 Ω
RFR
18 Ω
VREG
–1
VREG
RINGING
27.5x PARALLEL
DATA
INTERFACE
RINGIN B0 B1 B2
X1
X1
RCVN
RCVP
CURRENT
LIMIT
AND
INRUSH
CONTROL
RING
LOOP
RECTIFIERVTX
COMMON-
MODE
CURRENT
DETECTOR
TRIP
CLOSURE
VREF
–
+
9216A GAIN = 4
+
–
+
–
–
+
GAIN
AX
9216G GAIN = 1
ac INTERFACE
B0
B1
B2
PR
PT
FB1
DCOUT
CF2
CF1
RTFLT
5
6
7
8
9
10
11
42128273
12 14 15 16 17 1813
25
24
23
22
21
20
19
NSTATVBAT2
AGND
ICM
RGDET
VBAT1
VCC
BGND
VPROG
RINGIN
VREF FB2
VTX
TXI
VITR
RCVP
RCVN
26
ITR
L9216 PR
28-PIN PLCC
Product Brief
October 2000
Short-Loop Ringing SLIC with Ground Start
L9216A/G
3 Lucent Technologies Inc.
Applications
12-3534.J (F)
Figure 3. Third-Generation Codec ac Interface Network; Complex Termination
VBAT1 BGND VBAT2 VCC AGND ICM RGDET
ground key
not used
CBAT1
0.1 µF
CBAT2
0.1 µF
CCC
0.1 µF
RTFLT
DCOUT
PR
PT
VPROG
VREF
CRT
0.1 µF
RRT
383 kΩ
LUCENT
L7591
VBAT2
FUSIBLE OR PTC
50 Ω
50 Ω
CF1 CF2
rate of battery
reversal not
ramped
FB1 FB2 NSTAT B2 B1 B0
CF1
0.47 µFCF2
0.1 µF
RINGIN
VITR
RCVP
RCVN
ITR
VTX
TXI
RGX
4640 Ω
VBAT1
DBAT1
VBAT2 VCC
CTX
0.1 µF
CRING
0.47 µF
CC1
PCM
HIGHWAY
DX0
DR0
DX1
DR1
FS
BCLK
DGND
VDD
SYNC
AND
VDD
VFXI
VFROP
VFRON
SLIC4a
SLIC3a
SLIC2a
SLIC0a
CLOCK
L9216G
FROM/TO
CONTROL
B2
B1
NSTAT
B0
0.1 µF
FUSIBLE OR PTC
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
October 2000
PB00-138ALC
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