器件名称:
Am79R79-2jc
功能描述:
Ringing Subscriber Line Interface Circuit
文件大小:
340.67KB 共20页
简 介:
Am79R79 Ringing Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS I Ideal for short-loop applications I Ideal for ISDN terminal adaptor and fixed radio access applications I On-chip ringing with on-chip ring-trip detector I Low standby state power I Battery operation: — VBAT1: –40.5 V to –75 V — VBAT2: –19 V to VBAT1 I On-chip battery switching and feed selection I On-hook transmission I Two-wire impedance set by single external impedance I Programmable constant-current feed I Programmable Open Circuit voltage I Programmable loop-detect threshold I Current gain = 1000 I Ground-key detector I Tip Open state for ground-start lines I Polarity reversal option available I Internal VEE regulator (no external –5 V power supply required) I Two on-chip relay drivers and snubber circuits (32 PLCC) BLOCK DIAGRAM Relay Driver RTRIP1 RTRIP2 Relay Driver RYOUT2 RYE RYOUT1 D1 D2 C1 C2 C3 E1 DET RD VTX RSN RINGIN RDC RDCR A(TIP) Ring-Trip Detector HPA Two-Wire Interface HPB Signal Transmission B(RING) Power-Feed Controller Ground-Key Detector Off-Hook Detector Input Decoder and Control VBAT2 Switch Driver VBAT1 RSGL RSGH B2EN VCC VNEG BGND AGND/DGND Publication# 19752 Rev: G Amendment: /0 Issue Date: October 1999 GENERAL DESCRIPTION The AMD family of subscriber line interface circuit (SLIC) products provide the telephone interface functions required throughout the worldwide market. AMD SLIC devices address all major telephony markets including central office (CO), private ……
