L9216G データシートの表示（PDF） - Agere -> LSI Corporation

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L9216G

Short-Loop Ringing SLIC with Ground Start

Agere -> LSI Corporation 

Preliminary Data Sheet

September 2001

L9216A/G

Short-Loop Ringing SLIC with Ground Start

State Definitions

Forward Active

s Pin PT is positive with respect to PR.

s VBAT2 is applied to tip/ring drive amplifiers.

s Loop closure and common-mode detect are active.

s Ring trip detector is turned off to conserve power.

s Overhead is set to nominal 6.0 V for undistorted

transmission of 3.14 dBm into 900 Ω.

Reverse Active

s Pin PR is positive with respect to PT.

s VBAT2 is applied to tip/ring drive amplifiers.

s Loop closure and common-mode detect are active.

s Ring trip detector is turned off to conserve power.

s Overhead is set to nominal 6.0 V for undistorted

transmission of 3.14 dBm into 900 Ω.

On-Hook Transmission—Reverse Battery

s Pin PR is positive with respect to PT.

s VBAT1 is applied to tip/ring drive amplifiers.

s Supervision circuits, loop closure, and common-

mode detect are active.

s Ring trip detector is turned off to conserve power.

s On-hook transmission is allowed.

s 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

s The tip/ring amplifiers and all supervision are turned

off.

s The SLIC goes into a high-impedance state.

s NSTAT is forced high (on-hook).

s Device will power up in this state.

Scan

s Except for loop closure, all circuits (including ring trip

and common-mode detector) are powered down.

s On-hook transmission is disabled.

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

applied to tip/ring.

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

icallybetween –44 V and –51 V with a –70 V primary

battery.

On-Hook Transmission—Forward Battery

s Pin PT is positive with respect to PR.

s VBAT1 is applied to tip/ring drive amplifiers.

s Supervision circuits, loop closure, and common-

mode detect are active.

s Ring trip detector is turned off to conserve power.

s On-hook transmission is allowed.

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

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

battery.

Agere Systems Inc.

Ring

s Power ring signal is applied to tip and ring.

s Input waveform at RINGIN is amplified.

s Ring trip supervision and common-mode current

supervision are active; loop closure is inactive.

s Overhead voltage is reduced to typically 4 V.

s Current is limited by saturation current of the amplifi-

ers themselves, typically 100 mA at 125 °C.

Ground Start

s Tip drive amplifer is turned off.

s Device presents a high impedance (>100 kΩ) to pin

PT.

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

battery (VBAT1) to PR.

s Output pin RGDET indicates current flowing in the

ring lead.

Thermal Shutdown

s Not controlled via truth table inputs.

s NSTAT is forced low (off-hook) during this state.

s This mode is caused by excessive heating of the

device, such as may be encountered in an extended

power cross situation.

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