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AM79R79-2JC Scheda tecnica(PDF) 1 Page - Advanced Micro Devices |
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AM79R79-2JC Scheda tecnica(HTML) 1 Page - Advanced Micro Devices |
1 / 20 page Publication# 19752 Rev: G Amendment: /0 Issue Date: October 1999 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 E1 D2 D1 Two-Wire Interface HPA HPB Input Decoder and Control Relay Driver Ring-Trip Detector Power-Feed Controller RTRIP1 RTRIP2 BGND VCC VNEG RD RDC AGND/DGND VBAT2 A(TIP) B(RING) RYOUT1 RDCR C1 Switch Driver VBAT1 RSGL Ground-Key Detector Off-Hook Detector Relay Driver RYOUT2 C2 C3 RSGH B2EN RSN VTX Signal Transmission RINGIN RYE DET |
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