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參數資料
| 型號： | L9216A |
| 英文描述： | CAP CER 270PF 3.15KVDC R3 RAD |
| 中文描述： | 短環振鈴用戶接口與地面開始 |
| 文件頁數： | 5/48頁 |
| 文件大小： | 1062K |
| 代理商： | L9216A |
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Preliminary Data Sheet
September 2001
Short-Loop Ringing SLIC with Ground Start
L9216A/G
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
6.0 V, allowing for an undistorted signal of 3.14 dBm
into 900
. This overhead is fixed. The ring trip detec-
tor 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
battery 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 (ac-cou-
pled) is 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.
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.
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-lim-
ited battery (V
BAT1
) to PR. V
BAT1
is clamped to less than
56.5 V in this mode as PR. A ring current detector for
ring ground detection is included for ground start appli-
cations. The threshold is user programmable via exter-
nal resistors. See the Applications section of this data
sheet for more information on supervision functions.
Output pin RGDET indicates current flowing in the ring
lead.
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.
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.
Longitudinal balance is consistent with North American
GR-909 requirements. Specifications are given in Table
12.
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 L9216 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.
Overhead in the active modes (V
BAT2
applied) is fixed
to approximately 6.0 V is achieved. This is adequate
for a 3.14 dBm overload into 900
.
Transmit and receive gains have been chosen to mini-
mize the number of external components required in
the SLIC-codec ac interface, regardless of the choice
of codec.
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相關代理商/技術參數 |
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|---|---|
| L9217A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and PPM |
| L9218A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| L9219A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
| L9222 | 功能描述:功率驅動器IC Quad Inv Tran Switch RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L9222_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD INVERTING TRANSISTOR SWITCH |
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