LUCL9500AGF-D datasheet(10/32 Pages) AGERE

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Preliminary Data Sheet

September 2001

High-Voltage Ringing SLIC for VoIP Applications

L9500A

Agere Systems Inc.

State Definitions

Forward Active

Pin PT is positive with respect to PR.

VBAT2 is applied to tip/ring drive amplifiers.

Loop closure and common-mode detect are active.

Ring trip detector is turned off to conserve power.

Overhead is set to nominal 6.0 V for undistorted

transmission of 3.14 dBm into 900

Ω.

Reverse Active

Pin PR is positive with respect to PT.

VBAT2 is applied to tip/ring drive amplifiers.

Loop closure and common-mode detect are active.

Ring trip detector is turned off to conserve power.

Overhead is set to nominal 6.0 V for undistorted

transmission of 3.14 dBm into 900

Ω.

Scan

Except for loop closure, all circuits (including ring trip

and common-mode detector) are powered down.

On-hook transmission is disabled.

Pin PT is positive with respect to PR, and VBAT1 is

applied to tip/ring.

The tip to ring on-hook differential voltage will be typ-

ically between –44 V and –51 V with a –70 V primary

battery.

On-Hook Transmission

—Forward Battery

Pin PT is positive with respect to PR.

VBAT1 is applied to tip/ring drive amplifiers.

Supervision circuits, loop closure, and common-

mode detect are active.

Ring trip detector is turned off to conserve power.

On-hook transmission is allowed.

The tip-to-ring on-hook differential voltage will be typ-

ically between –41 V and –49 V with a –70 V primary

battery.

On-Hook Transmission

—Reverse Battery

Pin PR is positive with respect to PT.

VBAT1 is applied to tip/ring drive amplifiers.

Supervision circuits, loop closure, and common-

mode detect are active.

Ring trip detector is turned off to conserve power.

On-hook transmission is allowed.

The tip-to-ring on-hook differential voltage will be typ-

ically between –41 V and –49 V with a –70 V primary

battery.

Disconnect

The tip/ring amplifiers and all supervision are turned

off.

The SLIC goes into a high-impedance state.

NSTAT is forced high (on-hook).

Device will power up in this state.

Ring

Power ring signal is applied to tip and ring.

Input waveform at RINGIN is amplified.

Ring trip supervision and common-mode current

supervision are active; loop closure is inactive.

Overhead voltage is reduced to typically 4 V.

Current is limited by saturation current of the amplifi-

ers themselves, typically 100 mA at 125 °C.

Ground Start

Tip drive amplifer is turned off.

Device presents a high impedance (>100 k

Ω) to pin

PT.

Device presents a clamped (<56.5 V) current-limited

battery (VBAT1) to PR.

Output pin RGDET indicates current flowing in the

ring lead.

Thermal Shutdown

Not controlled via truth table inputs.

This mode is caused by excessive heating of the

device, such as may be encountered in an extended

power-cross situation. NSTAT output is forced low or

off hook during a thermal shutdown event.

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