AM79489 Datasheet | Legerity

Subscriber Line Interface Circuit 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 parator for ring-trip detection Ground-start capability On-hook transmission BLOCK DIAGRAM TMG DA DB Test Relay Driver Ring Relay Driver TESTOUT RINGOUT A(TIP) C1 HPA Two-Wire Interface Ring-Trip parator Ground-Key Detector Loop Detector Input Decoder and Control C2 C3 C4 E1 B(RING) Signal Transmission Power-Feed Controller Switch Control DET RD VTX RSN RDC CAS OVH RFA VBAT2 VBAT1 BGND BSWOUT BSWEN BSWTH AGND/DGND Publication# 080201 Rev: E Amendment: /0 Issue Date: October 1999 ORDERING INFORMATION Standard Products Legerity standard products are available in several packages and operating ranges. The order number (Valid bination) is formed by a bination of the elements below. - 1 TEMPERATURE RANGE C = mercial (0°C to 70°C)- PACKAGE TYPE J = 32-pin Plastic Leaded Chip Carrier (PL 032) PERFORMANCE GRADE OPTION - 1 = 52 d B Longitudinal Balance, Polarity Reversal - 2 = 60 d B Longitudinal Balance, Polarity Reversal - 3 = 52 d B Longitudinal Balance, No Polarity...