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Data Sheet March 1997
L7554 Low-Power SLIC
Features
s Low active power (typical 165 mW during on-hook transmission)
s Sleep state for low idle power (76 mW)
s Quiet Tip/Ring polarity reversal
s Supports meter pulse injection
s Spare op amp for meter pulse filtering
s –24 V to –72 V power supply operation
s Distortion-free on-hook transmission
s Convenient operating states: — Forward powerup — Polarity reversal powerup — Forward low-power scan — Polarity reversal low-power scan — Ground start — Disconnect (high impedance)
s Adjustable supervision functions: — Off-hook detector with longitudinal rejection — Ground key detector — Ring trip detector
s Independent, adjustable, dc and ac parameters: — dc feed resistance — Loop current limit — Termination impedance
s Thermal protection
Descript
L7554 Datasheet
