AK5406 Datasheet, PDF (13/37 Pages) Asahi Kasei Microsystems – 80MSPS Triple ADC for Displays

ASAHI KASEI
[AK5406]
VSYNC is extracted from the internal Slicer output.
Black Loop Function, Offset Adjust Function
With a help of Black Loop operation during the Clamp period, offset of internal circuit
can be eliminated and Clamp level is retained to the set value.
Black level is arbitrarily pre-settable for each of 3 channels independently, in the range
from –4 to +20 by Black Loop Setting Value setting register.
In addition to enabling Black Loop function always during the Clamp period, it is also
possible to control Black Loop function to operate or to hold the condition by register
setting.
Black Loop function can be completely disabled.
Only in this case, each of channel offset adjust registers is valid and external offset
adjustment is enabled.
Gain Offset Control diagram below shows its relation.
OFFSET = 1FFH
OFFSET = 0FFH
1.0
OFFSET = 000H
0.5
0.0
00H
OFFSET = 1FFH
OFFSET = 0FFH
OFFSET = 000H
Gain
Fig. 8 Gain Offset Control
FFH
MS0592-E-01
13
2008/07