Datasheet > L8560

L8560

更新时间： 2024-10-17 22:31:39

品牌	Logo	应用领域
杰尔 - AGERE		/
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描述
Low-Power SLIC with Ringing

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L8560 数据手册

Data Sheet

April 2000

L8560 Low-Power SLIC with Ringing

Features

Description

■ Full-feature set for central office applications

The L8560 full-feature, low-power subscriber line

interface circuit (SLIC) is optimized for low power

consumption while providing an extensive set of fea-

tures. This part is ideal for ISDN terminal adapter

applications and short-loop, power-sensitive applica-

■ Also ideal for ISDN terminal adapters, pair gain,

and cable telephony applications

■ Auxiliary input for second battery, and internal

switch to enable its use to save power in short tele-

phone loops

tions such as pair gain and cable telephony. This part

is also designed for PBX, DLC, or CO applications.

■ 5 V only operation or optional ±5 V operation for

reduced power consumption

The SLIC includes an auxiliary battery input and a

battery switch. In short-loop applications, SLICs can

be used in high battery to present a high on-hook

voltage, and then switched to low battery to reduce

off-hook power.

■ Low active power (85 mW typical) and scan power

(61 mW typical) with 5 V only operation

■ Low active power (68 mW typical with auxiliary bat-

tery) and scan power (45 mW typical) with ±5 V

operation

To help minimize the required auxiliary battery volt-

age, the dc feed resistance and overhead voltage are

set at 55 Ω and 6.7 V, respectively. This allows an

undistorted on-hook transmission of a 3.14 dBm sig-

nal into a 900 Ω loop impedance.

■ Quiet tip/ring polarity reversal

■ Per-line ringing available for short loops

■ Reduced overhead and increased current limit dur-

ing ring mode for lower-battery operation or

increased ring loop length

The device offers the reverse battery function. Using

the reverse battery, the device can provide a bal-

anced power ring signal to tip and ring. In this

mode of operation, the battery switch is used to

apply a high-voltage battery during ringing and a

lower-voltage battery during the talk and idle states.

Also included in the L8560 is a dc current-limit

switch, which increases the dc current limit during

power ringing. In addition, dc overhead voltage is

reduced during the ring state. With the battery and

current-limit switches, and overhead reduction, the

L8560 can provide sufficient power to ring a true

North American 5 REN load of 1386 Ω + 40 µF.

■ Supports meter pulse injection

■ Distortion-free full duplex from 0 mA dc loop cur-

rent on-hook transmission

■ Convenient operating states:

— Forward powerup

— Polarity reversal powerup

— Forward sleep

— Ground start

— Disconnect

■ Adjustable supervision functions:

— Off-hook detector with longitudinal rejection

— Ground key detector with longitudinal rejection

— Ring trip detector

The device offers ring trip and loop closure supervi-

sion with 0.3 V and 2 mA hysteresis, respectively. It

also includes the ground start state and ring ground

detection. A summing node for meter pulse injection

to 2.2 Vrms is also included. The 44-pin PLCC ver-

sion also has a spare uncommitted op amp, which

may be used for ac gain setting or meter pulse filter-

ing.

■ Independent, adjustable dc and ac parameters:

— dc feed resistance (44-pin PLCC version)

— Loop current limit

— Termination impedance

■ Thermal protection

12 3 4 5 6 7...46

中文翻译

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