YTD428 Datasheet, PDF (3/14 Pages) YAMAHA CORPORATION – DSU LSI for the ISDN Terminal Equipment

BLOCK DIAGRAM
❒ Internal 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
-3-