ADV7322 Datasheet, PDF (53/88 Pages) Analog Devices – Multiformat 11-Bit HDTV Video Encoder

Preliminary Technical Data
ADV7322
SD Brightness Detect
[Subaddress 0x7A]
The ADV7322 allows monitoring of the brightness level of the
incoming video data. Brightness detect is a read-only register.
Double Buffering
[Subaddress 0x13, Bit 7; Subaddress 0x48, Bit 2]
Double buffered registers are updated once per field on the
falling edge of the VSYNC signal. Double buffering improves
the overall performance since modifications to register settings
will not be made during active video, but takes effect on the
start of the active video.
NTSC WITHOUT PEDESTAL
100 IRE
Double buffering can be activated on the following HD
registers: HD Gamma A and Gamma B curves and HD CGMS
registers.
Double buffering can be activated on the following SD registers:
SD Gamma A and Gamma B curves, SD Y Scale, SD U Scale, SD
V Scale, SD Brightness, SD Closed Captioning, and SD
Macrovision Bits 5 to 0.
+7.5 IRE
0 IRE
NO SETUP
VALUE ADDED
POSITIVE SETUP
VALUE ADDED
NEGATIVE SETUP
VALUE ADDED
Figure 68. Examples of Brightness Control Values
–7.5 IRE
Rev. PrA | Page 53 of 88