DISTINCTIVE CHARACTERISTICS

■ Ideal for low power sensitive applications

■ Low standby power (normal and reverse)

■ Automatic on-chip battery switching

■ On-chip thermal management

■ On-chip thermal shutdown

■ –20 V to –60 V battery operation

■ Programmable current limit

■ Programmable resistive feed

■ Programmable loop-detect threshold

■ Selectable overhead for metering applications

■ Two-wire impedance set by single external impedance

■ On-chip ring and test relay drivers and relay snubber circuits

■ Polarity reversal (full transmission)

■ Loop and ground-key detector

■ Comparator for ring-trip detection

■ Ground-start capability

■ On-hook transmission