Datasheet

REV. A
AD9848/AD9849
–19–
NOTES
1. PIXEL CLOCK PERIOD IS DIVIDED INTO 48 POSITIONS, PROVIDING FINE EDGE RESOLUTION FOR HIGH SPEED CLOCKS.
2. THERE IS A FIXED DELAY FROM THE CLI INPUT TO THE INTERNAL PIXEL PERIOD POSITIONS (
t
CLIDLY
= 6 ns TYP).
P[0]
P[48] = P[0]
P[12] P[24] P[36]
1 PIXEL
PERIOD
...
...
CLI
t
CLIDLY
POSITION
Figure 4. High Speed Clock Resolution from CLI Master Clock Input
H1/H3
H2/H4
CCD SIGNAL
RG
(1) (2)
(3)
(4)
(5) (6)
NOTES
PROGRAMMABLE CLOCK POSITIONS:
(1) RG RISING EDGE AND (2) FALLING EDGE
(3) SHP AND (4) SHD SAMPLE LOCATION
(5) H1/H3 RISING EDGE POSITION AND (6) FALLING EDGE POSITION (H2/H4 ARE INVERSE OF H1/H3)
Figure 5. High Speed Clock Programmable Locations
P[0]
PIXEL
PERIOD
RG
H1/H3
RGf[12]
P[48] = P[0]
Hf[24]
SHP[28]
CCD SIGNAL
P[24]
P[12]
P[36]
Hr[0]
RGr[0]
SHD[48]
NOTES
1. ALL SIGNAL EDGES ARE FULLY PROGRAMMABLE TO ANY OF THE 48 POSITIONS WITHIN ONE PIXEL PERIOD.
2. DEFAULT POSITIONS FOR EACH SIGNAL ARE SHOWN ABOVE.
POSITION
t
S1
Figure 6. High Speed Clock Default and Programmable Locations