AM79M576A

Am79M576A Metering Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant-resistance feed s Programmable loop-detect threshold s Ground-key detect s Performs polarity reversal s Ring relay driver s Supports 2.2 Vrms metering (12 and 16 kHz) s Line feed characteristics independent of battery variations s On-chip switching regulator for low-power dissipation s Two-wire impedance set by single external impedance s Tip Open state for ground-start lines s On-hook transmission BLOCK DIAGRAM A(TIP) Ring Relay Driver Ground-Key Detector Input Decoder and Control VCCRING RINGOUT/DGND C1 C2 C3 E0 HPA HPB Two-Wire Interface DET Signal Transmission VTX RSN B(RING) Off-Hook Detector RD Power-Feed Controller RDC m o c . u 4 t e e h s a t a .d w w w DA DB VREG L VBAT BGND Ring-Trip Detector Switching Regulator CHS QBAT CHCLK VCC VEE AGND/DGND Publication# 18412 Rev: D Amendment: /0 Issue Date: October 1999 www.DataSheet4U.com E1 ORDERING INFORMATION Standard Products AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below. Am79M576A J C TEMPERATURE RANGE C = Commercial (0°C to 70°C)* PACKAGE TYPE J = 32-pin Plastic Leaded Chip Carrier (PL 032) PERFORMANCE GRADE Blank = Standard Specification –1 = Performance Grading –2 = Performance Grading DEVICE NUMBER/DESCRIPTION Am79M576A Metering Subscriber Line Interface Circuit Valid Combi...