YTD428_07 Datasheet, PDF (6/28 Pages) YAMAHA CORPORATION – IDSU ISDN DSU for Terminal Equipment

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2. BLOCK DIAGRAM
2.1 Internal Block Diagram
BLOCK DIAGRAM
YTD428
U ref. pt. I/F section
ADC
Variable
Amplifier
Peak hold
T ref. pt. I/F section
T ref. pt.
driver
T ref. pt.
receiver
Interface
switch section
CT block
LT block
CT/LT section
U ref. pt.
driver control
TTL I/F
S/T ref. pt. LSI
YTD418 or
YTD423
CT : Circuit Termination
LT : Line Termination