描述 Description

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.

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 reversal may be ramped to meet international requirements. Additionally, a low-power scan mode, wherein all circuitry except the off-hook supervision is shut down to conserve power, is available.

特性 Features

■ Basic forward/reverse battery SLIC functionality at a low cost

■ Pin compatible with Agere Systems Inc. L9217 and L9218 SLICs

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

■ 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

— Disconnect (high impedance)

■ Minimal external components required

■ Two gain options to optimize the codec interface

■ Adjustable supervision functions:

— Off-hook detector with hysteresis

— Ring trip detector

■ Logic controlled high and low current limit

■ Ramped rate of battery reversal

■ Thermal protection with thermal shutdown indication