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參數(shù)資料
| 型號： | L9500A |
| 英文描述： | High-Voltage Ringing SLIC for VolP Applications |
| 中文描述： | 高壓振鈴用戶接口應(yīng)用的福爾普 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大小： | 616K |
| 代理商： | L9500A |
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Preliminary Data Sheet
September 2001
High-Voltage Ringing SLIC for VoIP Applications
L9500A
10
Agere Systems Inc.
State Definitions
Forward Active
I
Pin PT is positive with respect to PR.
I
V
BAT2
is applied to tip/ring drive amplifiers.
I
Loop closure and common-mode detect are active.
I
Ring trip detector is turned off to conserve power.
I
Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900
.
Reverse Active
I
Pin PR is positive with respect to PT.
I
V
BAT2
is applied to tip/ring drive amplifiers.
I
Loop closure and common-mode detect are active.
I
Ring trip detector is turned off to conserve power.
I
Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900
.
Scan
I
Except for loop closure, all circuits (including ring trip
and common-mode detector) are powered down.
I
On-hook transmission is disabled.
I
Pin PT is positive with respect to PR, and V
BAT1
is
applied to tip/ring.
I
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
I
Pin PT is positive with respect to PR.
I
V
BAT1
is applied to tip/ring drive amplifiers.
I
Supervision circuits, loop closure, and common-
mode detect are active.
I
Ring trip detector is turned off to conserve power.
I
On-hook transmission is allowed.
I
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
I
Pin PR is positive with respect to PT.
I
V
BAT1
is applied to tip/ring drive amplifiers.
I
Supervision circuits, loop closure, and common-
mode detect are active.
I
Ring trip detector is turned off to conserve power.
I
On-hook transmission is allowed.
I
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
I
The tip/ring amplifiers and all supervision are turned
off.
I
The SLIC goes into a high-impedance state.
I
NSTAT is forced high (on-hook).
I
Device will power up in this state.
Ring
I
Power ring signal is applied to tip and ring.
I
Input waveform at RING
IN
is amplified.
I
Ring trip supervision and common-mode current
supervision are active; loop closure is inactive.
I
Overhead voltage is reduced to typically 4 V.
I
Current is limited by saturation current of the amplifi-
ers themselves, typically 100 mA at 125 °C.
Ground Start
I
Tip drive amplifer is turned off.
I
Device presents a high impedance (>100 k
) to pin
PT.
I
Device presents a clamped (<56.5 V) current-limited
battery (V
BAT1
) to PR.
I
Output pin RGDET indicates current flowing in the
ring lead.
Thermal Shutdown
I
Not controlled via truth table inputs.
I
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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