LUCL9500AGF-D datasheet(4/32 Pages) AGERE

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Preliminary Data Sheet

September 2001

High-Voltage Ringing SLIC for VoIP Applications

L9500A

Agere Systems Inc.

Features

On board 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

Power supplies requirements:

— VCC talk battery and ringing battery required

— No –5 V supply required

— No high-voltage positive supply required

Flexible Vcc options:

— 5 V or 3.3 V VCC operation

— 5 V or 3.3 V VCC interchangeable and transparent

to users

Battery switch via logic control:

— Minimize off-hook power dissipation

Minimal external components required

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

Unlatched parallel data control interface

Ultralow SLIC power:

— Scan 38 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)

Supervision:

— Loop start, fixed threshold with hysteresis

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

old as a function of battery voltage

— Ground start fixed threshold with hysteresis

Adjustable current limit:

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

input

Overhead voltage:

— Clamped typically <51 V differentially

— Clamped maximum <56.5 V single-ended

Thermal shutdown protection with hysteresis

Device interfaces:

— Differential receive interface

— Singled-ended transmit interface

— Differential ring input

Package options:

— 28-pin PLCC

— 48-pin MLCC

90 V CBIC-S technology

Description

The L9500 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 L9500 offers 8 operating states. The device

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

voltage ringing battery, and a VCC supply.

The L9500 requires only a positive VCC supply. No

–5 V supply is needed. The L9500 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.

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