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L9216G

Short-Loop Ringing SLIC with Ground Start

Agere -> LSI Corporation 

L9216A/G

Short-Loop Ringing SLIC with Ground Start

Preliminary Data Sheet

September 2001

Features

s Onboard balanced ringing generation:

— No ring relay

— No bulk ring generator required

— 15 Hz to 70 Hz ring frequency supported

— Sine wave input-sine wave output

— PWM input-sine wave output

— Square wave input-trapezoidal output

s Power supplies requirements:

— VCC talk battery and ringing battery required

— No –5 V supply required

— No high-voltage positive supply required

s Flexible Vcc options:

— 5 V or 3.3 V VCC operation

— 5 V or 3.3 V VCC interchangeable and transparent

to users

s Battery switch via logic control:

— Minimize off-hook power dissipation

s Minimal external components required

s Eight operating states:

— Forward active, VBAT2 applied

— Polarity reversal active, VBAT2 applied

— On-hook transmission, VBAT1 applied

— On-hook transmission polarity reversal, VBAT1

applied

— Ground start

— Scan

— Forward disconnect

— Ring mode

s Unlatched parallel data control interface

s Ultralow SLIC power:

— Scan 37 mW (VCC = 5 V)

— Forward/reverse active 54 mW (VCC = 5 V)

— Scan 27 mW (VCC = 3.3 V)

— Forward/reverse active 41 mW (VCC = 3.3 V)

s Supervision:

— Loop start, fixed threshold with hysteresis

— Ring trip, single-pole ring trip filtering, fixed thresh-

old as a function of battery voltage

— Ring current for ground start applications, user-

adjustable threshold

s Adjustable current limit:

— 25 mA or 40 mA via ground or open to control

input

s Overhead voltage:

— Clamped typically <51 V differentially

— Clamped maximum <56.5 V single-ended

s Thermal shutdown protection with hysteresis

s Longitudinal balance:

— Telcordia Technologies GR-909 balance

s ac interface:

— Two SLIC gain options to minimize external com-

ponents required for interface to first- or third-gen-

eration codecs

— Sufficient dynamic range for direct coupling to

codec output

s 28-pin PLCC/48-pin MLCC package

s 90 V CBIC-S technology

Description

The L9216 is designed to provide battery feed, ringing,

and supervision functions on short plain old telephone

service (POTS) loops. This device is designed for

ultralow power in all operating states.

The L9216 offers eight operating states. The device

assumes uses of a lower-voltage talk battery, a higher-

voltage ringing battery, and a VCC supply.

The L9216 requires only a positive VCC supply. No

–5 V supply is needed. The L9216 can operate with a

VCC of either 5 V or 3.3 V, allowing for greater user flex-

ibility. The choice of VCC voltage is transparent to the

user; the device will function with either supply voltage

connected.

Two batteries are used:

1. A high-voltage ring battery (VBAT1).

VBAT1 is a maximum –75 V. VBAT1 is used for power

ring signal amplification and for scan, on-hook

transmission, and ground start modes. This supply

is current limited to approximately the maximum

power ringing current, typically 50 mA.

2. A lower-voltage talk battery (VBAT2).

VBAT2 is used for active mode powering.

4

Agere Systems Inc.

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