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參數(shù)資料
| 型號： | LE57D113TC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 546K |
| 代理商： | LE57D113TC |
P R E L I M I N A R Y
4
Le57D11 Data Sheet
Two-Wire Interface
The two-wire interfaces provide DC current and send voice signals to a telephone apparatus connected to the line card with a
two-wire line. The two-wire interface also receives the returning voice signals from the telephone transmitter.
Signal Transmission
The AC line voltage is sensed by a differential amplifier between the A
i
(TIP) and HP
i
leads. The output of this amplifier is equal
to the AC metallic components of the line voltages and is output at VTX
i
. The transmission circuit also contains a longitudinal
feedback circuit to shunt longitudinal signals to a DC bias voltage. The longitudinal feedback does not affect metallic signals.
Power Feed Controller and Common Bias
The power feed controllers have three sections: (1) the battery feed circuit, (2) the polarity reversal circuit, and (3) the common
bias circuit. The battery feed circuit regulates the amount of DC current and voltage supplied to the telephone over a wide range
of loop resistance. The polarity reversal circuit provides the capability to reverse the loop current for pay telephone key pad
disable and other applications. The bias circuit provides a filtered reference voltage, which is offset from the subscriber line
voltage, and a signal which sets the current limit.
Input Decoder and Control
The input decoder and control block provides a means for a microprocessor or SLAC IC to control such system states as Active,
Standby, Disconnect (Ringing), and Polarity Reversal. The input decoder and control block has TTL-compatible inputs, which set
the operating states of the SLIC device.
Off-Hook Detector
The most important loop monitoring function is off-hook detection. Loop current is programmed for both channels by a single
resistor. Loop detect threshold is typically 1/3 of the programmed Loop current in the Active and Reverse Polarity states.
Ring-Trip Detector
In the Disconnect state, the ring-trip detector is active. While the DB
i
pin is more negative than the DAC pin, the DET pin will be
high to indicate on hook. When an off hook condition occurs, the DB
i
pin becomes more positive than the DAC pin, and the DET
pin will go low to indicate off hook during ringing (ring-trip) has been detected. The system implements the Ringing state using
external control of a ring relay in combination with the Disconnect SLIC state, which enables the ring-trip detector.
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