AD9992_15 Datasheet, PDF (49/92 Pages) Analog Devices – 12-Bit CCD Signal Processor with Precision Timing Generator

AD9992
VD
HD
VSG
t_EXP
t_EXP
SUBCK
SUBCK PROGRAMMABLE SETTINGS:
1. PULSE POLARITY USING THE SUBCK_POL REGISTER.
2. NUMBER OF PULSES WITHIN THE FIELD USING THE SUBCKNUM REGISTER (SUBCKNUM = 3 IN THE ABOVE EXAMPLE).
3. PIXEL LOCATION OF PULSE WITHIN THE LINE AND PULSE WIDTH PROGRAMMED USING THE SUBCK1 TOGGLE POSITION REGISTERS.
Figure 56. Normal SUBCK Operation
VD
HD
VSG
t_EXP
t_EXP
SUBCK
NOTES
1. SECOND SUBCK PULSE IS ADDED IN THE LAST SUBCK LINE.
2. LOCATION OF SECOND PULSE IS FULLY PROGRAMMABLE USING THE SUBCKHP TOGGLE POSITION REGISTERS.
Figure 57. High Precision SUBCK Operation
TRIGGER
EXPOSURE
(0x70)
VD
VSG
SUBCK
t_EXP
NOTES
1. SUBCK CAN BE SUPPRESSED FOR MULTIPLE FIELDS BY PROGRAMMING THE EXPOSURE REGISTER TO BE GREATER THAN 0.
2. ABOVE EXAMPLE USES EXPOSURE = 1.
3. TRIGGER REGISTER MUST ALSO BE USED TO START THE LOW SPEED EXPOSURE.
4. VD/HD OUTPUTS CAN ALSO BE SUPPRESSED USING THE VDHDOFF REGISTER = 1.
Figure 58. Low Speed SUBCK Operation
Rev. C | Page 49 of 92