Datasheet > L9219A

L9219A

更新时间： 2024-09-27 22:31:39

品牌	Logo	应用领域
杰尔 - AGERE		电池
页数	文件大小	规格书
30页	381K
描述
Low-Cost Line Interface with Reverse Battery and Dual Current Limit

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L9219A 数据手册

Data Sheet

November 2001

L9219A/G Low-Cost Line Interface

with Reverse Battery and Dual Current Limit

Features

Description

■ Basic forward/reverse battery SLIC functionality at

a low cost

This general-purpose electronic subscriber loop

interface circuit (SLIC) is optimized for low cost, while

still providing a satisfactory set of features. This part

is a pin-for-pin replacement for the Agere L9217 and

L9218 SLICs.

■ Pin compatible with Agere Systems Inc. L9217 and

L9218 SLICs

■ Low active power (typical 138 mW during on-hook

transmission)

The L9219 requires a 5 V power supply and single

battery to operate. This device offers forward and

reverse battery operation. The rate of battery rever-

sal may be ramped to meet international require-

ments. Additionally, a low-power scan mode, wherein

all circuitry except the off-hook supervision is shut

down to conserve power, is available.

■ Low-power scan mode for low-power, on-hook

power dissipation (52 mW typical)

■ Distortion-free, on-hook transmission

■ Convenient operating states:

— Forward active-low current limit

— Forward active-high current limit

— Reverse active-low current limit

— Reverse active-high current limit

— Low-power scan

The dc current limit may be programmed via a single

external resistor. Via the logic table, the current limit

may be increased a nominal 42% above the value

PROG

set by the I

resistor, giving the user a high-low

current limit option.

— Disconnect (high impedance)

Device overhead is fixed and is adequate for

3.14 dBm into 900 Ω of on-hook transmission.

■ Minimal external components required

Both the loop supervision and ring trip supervision

functions are offered with user-controlled thresholds

via external resistors.

■ Two gain options to optimize the codec interface

■ Adjustable supervision functions:

— Off-hook detector with hysteresis

— Ring trip detector

The L9219 is offered with a receive gain that is opti-

mized for interface to a first-generation type codec

(L9219A). It is also offered with a gain option that is

optimized for interface to a third- or fourth-generation

type codec (L9219G). In both cases, minimizing

external components required at this interface.

■ Logic controlled high and low current limit

■ Ramped rate of battery reversal

■ Thermal protection with thermal shutdown indica-

tion

Data control is via a parallel data control scheme.

The device is available in a 28-pin PLCC package. It

is built by using a 90 V complementary bipolar

(CBIC) process.

12 3 4 5 6 7...30

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