參數(shù)資料
型號(hào)： LUCL9500AGF-D
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(yè)數(shù)： 5/32頁(yè)
文件大小： 616K
代理商： LUCL9500AGF-D
Preliminary Data Sheet
September 2001
High-Voltage Ringing SLIC for VoIP Applications
L9500A
Agere Systems Inc.
5
Description
(continued)
Forward and reverse battery active modes are used for
off-hook conditions. Since this device is designed for
short-loop applications, the lower-voltage V
BAT2
is
applied during the forward and reverse active states
.
Battery reversal is quiet, without breaking the ac path.
Rate of battery reversal may be ramped to control
switching time.
The magnitude of the overhead voltage in the forward
and reverse active modes has a typical default value of
7.0 V, allowing for an on-hook transmission of an undis-
torted signal of 3.14 dBm into 900
. Additionally, this
allows sufficient overhead for 500 mV of meter pulse if
desired. This overhead is fixed. The ring trip detector is
turned off during active modes to conserve power.
Because on-hook transmission is not allowed in the
scan mode, an on-hook transmission mode is defined.
This mode is functionally similar to the active mode,
except the tip ring voltage is derived from the higher
V
BAT1
rather than V
BAT2
.
In the on-hook transmission modes with a primary bat-
tery whose magnitude is greater than a nominal
51 V, the magnitude of the tip-to-ground and ring-to-
ground voltage is clamped at less than 56.5 V.
To minimize on-hook power, a low-power scan mode is
available. In this mode, all functions except off-hook
supervision are turned off to conserve power. On-hook
transmission is not allowed in the scan mode.
In the scan mode with a primary battery whose magni-
tude is greater than a nominal 51 V, the magnitude of
the tip-to-ground and ring-to-ground voltage is clamped
at less than 56.5 V.
A forward disconnect mode is provided, where all cir-
cuits are turned off and power is denied to the loop.
The device offers a ring mode, in which a power ring
signal is provided to the tip/ring pair. During the ring
mode, a user-supplied, low-voltage ring signal is differ-
entially input to the device’s RING
IN
input. This signal is
amplified to produce the power ring signal. This signal
may be a sine wave or filtered square wave to produce
a sine wave on trapezoidal output. Ring trip detector
and common-mode current detector are active during
the ring mode.
With maximum V
BAT1
and a sine wave input, the L9500
has sufficient power to ring a 5 REN (1386
+ 40
μ
F)
ringing load into 500
of physical resistance.
This feature eliminates the need for a separate external
ring relay, associated external circuitry, and a bulk ring-
ing generator. See the Applications section of this data
sheet for more information.
Both the ring trip and loop closure supervision func-
tions are included. The loop closure has a fixed typical
10.5 mA on- to off-hook threshold in the active mode
and a fixed 11.5 mA on- to off-hook threshold from the
scan mode. In either case, there is a 2 mA hysteresis.
The ring trip detector requires only a single-pole filter at
the input, minimizing external components. The ring
trip threshold at a given battery voltage is fixed. Typical
ring trip threshold is 42.5 mA for a –70 V V
BAT1.
The device offers a ground start mode. In this mode the
tip drive amplifier is turned off. The device presents a
high impedance (>100 k
) to PT and a current limited
battery (V
BAT1
) to PR. V
BAT1
is clamped to less than
56.5 V in this mode at PR. The NSTAT loop current
detctor is used for ring ground detection. In the ground
start mode, since the loop current is common mode,
the loop closure threshold is reduced in half, thus main-
taining loop supervision at specified levels.
Upon reaching the thermal shutdown temperature, the
device will enter an all off mode. Upon cooling, the
device will re-enter the state it was in prior to thermal
shutdown. Hysteresis is built in to prevent oscillation.
Data control is via a parallel unlatched control scheme.
The dc current limit is fixed to either 25 mA or 40 mA
depending if ground or open is applied to the V
PROG
current limit programming pin. Programming accuracy
is ±8%.
Circuitry is added to the L9500 to minimize the inrush
of current from the V
CC
supply and to the battery supply
during an on- to off-hook transition, thus saving in
power supply design cost. See the Applications section
of this data sheet for more information.
The L9500 uses a voltage feed-current sense architec-
ture; thus the transmit gain is a transconductance. The
L9500 transconductance is set via a single external
resistor, and this device is designed for optimal perfor-
mance with a transconductance set at 300 V/A. This
interface is single ended. The L9500 offers a differen-
tial receive interface with a gain of 8.
The L9500 is internally referenced to 1.5 V. This refer-
ence voltage is output at the V
REF
output of the device.
The SLIC output VITR is also referenced to 1.5 V. The
SLIC inputs RCVP/RCVN
are floating inputs.
The L9500 is packaged in a 28-pin PLCC or a 48-pin
MLCC package.
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