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AM79535-2DC 데이터시트(PDF) 1 Page - Advanced Micro Devices |
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AM79535-2DC 데이터시트(HTML) 1 Page - Advanced Micro Devices |
1 / 20 page Publication# 16854 Rev: D Amendment: /0 Issue Date: October 1999 Am79534/Am79535 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant-current feed s Line-feed characteristics independent of battery variations s Programmable loop-detect threshold s On-chip switching regulator for low-power dissipation s Pin for external ground-key noise-filter capacitor available s Ground-key detect s Two-wire impedance set by single external impedance s Polarity reversal feature s Tip Open state for ground-start lines s Test relay driver optional s On-hook transmission BLOCK DIAGRAM Two-Wire Interface HPA HPB DA DB BGND VBAT A(TIP) B(RING) Ground-Key Detector Signal Transmission Power-Feed Controller Ring-Trip Detector VCC VEE AGND RINGOUT C1 C2 E1 E0 DET RSN VTX RD RDC Ring Relay Driver Input Decoder and Control Off-Hook Detector Test Relay Driver TESTOUT C3 C4 GKFIL Switching Regulator VREG L CHS QBAT CHCLK Notes: 1. Am79534—E0 and E1 inputs; ring and test relay drivers sourced internally to BGND. 2. Am79535—E0 and E1 inputs; ring relay driver sourced internally to BGND; ground-key filter pin. 3. Current gain (K1) = 1000 for all parts. 16854C-01 |
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