AD8155
50Ω CABLES
50Ω CABLES
50Ω CABLES
DATA OUT 2
2 INPUT OUTPUT 2
PIN
PIN
2 FR4 TEST BACKPLANE 2
2
50Ω
PATTERN
GENERATOR
AD8155
TP1 AC-COUPLED
EVALUATION
BOARD
DIFFERENTIAL
TP2 STRIPLINE TRACES
8mils WIDE, 8mils SPACE,
8mils DIELECTRIC HEIGHT
HIGH
TP3
SPEED
SAMPLING
OSCILLOSCOPE
TRACE LENGTHS = 20 INCHES,
30 INCHES
25ps/DIV
REFERENCE EYE DIAGRAM AT TP1
Figure 12. Output Preemphasis Test Circuit
25ps/DIV
Figure 13. 6.5 Gbps Output Eye, 20 Inch FR4 Input Channel, PE = 0
(TP3 from Figure 12)
25ps/DIV
Figure 15. 6.5 Gbps Output Eye, 20 Inch FR4 Input Channel, PE = Best Setting,
Default Output Level (TP3 from Figure 12)
25ps/DIV
Figure 14. 6.5 Gbps Output Eye, 30 Inch FR4 Input Channel, PE = 0
(TP3 from Figure 12)
25ps/DIV
Figure 16. 6.5 Gbps Output Eye, 30 Inch FR4 Input Channel, PE = Best Setting,
200 mV Output Level (TP3 from Figure 12)
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