AM79489

Am79489 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 Comparator 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 Comparator Ground-Key Detector Loop Detector Input Decoder and Control C2 C3 C4 E1 HPB B(RING) Signal Transmission Power-Feed Controller Switch Control DET RD VTX RSN RDC CAS OVH RFA VBAT2 VBAT1 BGND BSWOUT BSWEN BSWTH VCC 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 Combination) is formed by a combination of the elements below. Am79489 –1 J C TEMPERATURE RANGE C = Commercial (0°C to 70°C)* PACKAGE TYPE J = 32-pin Plastic Leaded Chip Carrier (PL 032) PERFORMANCE GRADE OP...