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AM79514 Datasheet(PDF) 1 Page - Advanced Micro Devices |
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AM79514 Datasheet(HTML) 1 Page - Advanced Micro Devices |
1 / 18 page Publication# 18411 Rev: D Amendment: /0 Issue Date: October 1999 Am79514 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant-current feed s Programmable loop-detect threshold s On-chip switching regulator for low-power dissipation s Polarity reversal feature s Optimized for –60 V battery s Line feed characteristics independent of battery variations s Two-wire impedance set by single external impedance s Tip Open state for ground-start lines s Ring and test relay drivers s On-hook transmission BLOCK DIAGRAM VTX DET VREG VBAT Signal Transmission Input Decoder and Control Ground-Key Detector Ring Relay Driver Test Relay Driver Off-Hook Detector Power-Feed Controller Ring-Trip Detector Switching Regulator TESTOUT RINGOUT RD RDC L Two-Wire A(TIP) HPA HPB B(RING) BGND DA DB CHS QBAT CHCLK VCC VEE AGND/DGND E1 C4 C2 C3 C1 Interface RSN Ring Relay Driver |
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