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參數資料
| 型號： | L9214A |
| 英文描述： | CAP CER 220PF 3.15KVDC R3 RAD |
| 中文描述： | 低成本振鈴用戶接口 |
| 文件頁數： | 13/46頁 |
| 文件大小： | 790K |
| 代理商： | L9214A |
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Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
Agere Systems Inc.
13
State Definitions
(continued)
Reverse Active (Fast Polarity Reversal)
Off-hook
I
Pin PR is positive with respect to PT.
I
V
BAT2
is applied to tip/ring drive amplifiers via the soft
battery switch for the majority of loop lengths. This
may also be derived from V
BAT1
through a power
control resistor.
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 4.0 V for undistorted
transmission of 0 dBm into 600
and may be
increased automatically for larger signal levels.
On-hook
I
Pin PR is positive with respect to PT.
I
V
BAT1
is applied to tip/ring drive amplifiers. The tip to
ring on-hook differential voltage will be between
–
42.5 V and
–
56.5 V with a primary battery of
–
65 V.
I
Loop closure and common-mode detect are active.
I
Ring trip detector is turned off to conserve power.
I
On-hook transmission is enabled.
I
Overhead is set to nominal 17.0 V for undistorted
transmission of 0 dBm into 600
.
Reverse Active (Slow Polarity Reversal)
Off-hook
I
Same as the reverse active (fast polarity reversal)
state, but with slower polarity reversal.
On-hook
I
Same as the reverse active (fast polarity reversal)
state, but with slower polarity reversal.
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
between
–
42.5 V and
–
56.5 V with a
–
65 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).
Ring
I
Ringing controlled digitally or by a PWM input signal
I
Power ring signal is applied to tip and ring.
I
Software-selectable slew rate, fast or slow.
I
Ring trip supervision and common-mode current
supervision are active; loop closure is inactive.
I
Overhead voltage is reduced to typically 2.5 V and
current limit set at I
PROG
is disabled.
I
Current is limited by saturation current of the amplifi-
ers themselves, typically 72 mA peak at 125
°
C.
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.
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