L9216B/H
High-Voltage Ringing SLIC with Ground Start
Preliminary Data Sheet
September 2001
On-Hook Transmission
—
Reverse Battery
s
s
State Definitions
Forward Active
s
s
s
s
s
Pin PR is positive with respect to PT.
V
BAT1
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 –85 V primary
battery.
Pin PT is positive with respect to PR.
V
BAT2
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.
s
s
s
s
Reverse Active
s
s
s
s
s
Disconnect
s
Pin PR is positive with respect to PT.
V
BAT2
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.
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.
s
s
s
Scan
s
Ring
s
s
s
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 V
BAT1
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 –85 V primary
battery.
Power ring signal is applied to tip and ring.
Input waveform at RING
IN
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.
s
s
s
s
s
On-Hook Transmission
—
Forward Battery
s
s
s
Ground Start
s
Tip drive amplifer is turned off.
Device presents a high impedance (>100 kΩ) to pin
PT.
Device presents a clamped (<56.5 V) current-limited
battery (V
BAT1
) to PR.
Output pin RGDET indicates current flowing in the
ring lead.
Pin PT is positive with respect to PR.
V
BAT1
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 –85 V primary
battery.
s
s
s
s
s
s
Thermal Shutdown
s
s
s
Not controlled via truth table inputs.
NSTAT is forced low (off-hook) during this state
This mode is caused by excessive heating of the
device, such as may be encountered in an extended
power-cross situation.
Agere Systems Inc.
10
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
