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參數資料
| 型號： | L7554 |
| 英文描述： | L7554 Low-Power SLIC |
| 中文描述： | L7554低功耗用戶接口 |
| 文件頁數： | 1/28頁 |
| 文件大?。?/td> | 486K |
| 代理商： | L7554 |
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Data Sheet
March 1997
L7554 Low-Power SLIC
Features
I
Low active power (typical 165 mW during on-hook
transmission)
I
Sleep state for low idle power (76 mW)
I
Quiet Tip/Ring polarity reversal
I
Supports meter pulse injection
I
Spare op amp for meter pulse filtering
I
–24 V to –72 V power supply operation
I
Distortion-free on-hook transmission
I
Convenient operating states:
— Forward powerup
— Polarity reversal powerup
— Forward low-power scan
— Polarity reversal low-power scan
— Ground start
— Disconnect (high impedance)
I
Adjustable supervision functions:
— Off-hook detector with longitudinal rejection
— Ground key detector
— Ring trip detector
I
Independent, adjustable, dc and ac parameters:
— dc feed resistance
— Loop current limit
— Termination impedance
I
Thermal protection
Description
This electronic subscriber loop interface circuit
(SLIC) is optimized for low-power consumption while
providing an extensive set of features.
Quiet polarity reversal is possible because the ac
path is uninterrupted during transition.
The L7554 includes the ground start state and a
summing node for meter pulse injection to 2.2 Vrms.
A spare, uncommitted op amp is included for meter
pulse filtering.
The device is being offered in two versions, based
upon maximum battery. The L7554AP is guaranteed
to –60 V, and the L7554BP is guaranteed to –72 V.
The device is available in a 44-pin PLCC package. It
is built by using a 90 V complementary bipolar
(CBIC) process.
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