cxa3516r Sony Electronics, cxa3516r Datasheet - Page 64

• Manufacturer Part Number: cxa3516r
• Description: 3-channel 8-bit 165msps A/d Converter Amplifier Pll
• Manufacturer: Sony Electronics

CLK Jitter Evaluation Method
The generated CLK is obtained by inputting Hsync to the CXA3516R. Apply this CLK to a digital oscilloscope
and observe the CLK waveform using Hsync as the trigger.
The CLK jitter is measured at peak to peak in the long-term write mode of the digital oscilloscope as shown in
the figure. The CLK jitter size varies according to the difference in the relative position with respect to Hsync.
Therefore, when the observation point is changed, the CLK jitter at that point is observed.
The figure below shows a typical example of the CLK jitter for the CXA3516R.
The CLK jitter increases slightly at the rising edge of Hsync (in the case of positive polarity), and then settles
down thereafter. However, this is not a problem as the active pixels start after about 20% of the H cycle has
passed from the rising edge of Hsync.
Computer signal
Hsync signal
Pulse
generator
Clock
Trigger
Hsync signal
0
H
sync
Clock
Back
porch
Enlarge
1/4 · Tsync
CXA3516R
15 to 25% of Tsync
Enlarge
Observation points
2/4 · Tsync
– 64 –
Clock
Tsync = 1/fsync
Tj p-p
Enlarge
Active
video
trigger
ch1
Digital
oscilloscope
3/4 · Tsync
Enlarge
Tsync
Front
porch
CXA3516R