adv7322 Analog Devices, Inc., adv7322 Datasheet - Page 52

• Manufacturer Part Number: adv7322
• Description: Multiformat 11-bit Hdtv Video Encoder
• Manufacturer: Analog Devices, Inc.

ADV7322
increments of 0.17578125°. For normal operation (zero
adjustment), this register is set to 0x80. Values 0xFF and 0x00
represent the upper and lower limits (respectively) of
adjustment attainable.
Hue Adjust (°) = 0.17578125° ( HCR
adjust value.
For example, to adjust the hue by +4°, write 0x97 to the Hue
Adjust Value register:
where the sum is rounded to the nearest integer.
To adjust the hue by −4°, write 0x69 to the Hue Adjust Value
register:
where the sum is rounded to the nearest integer.
SD Brightness Control
[Subaddress 0x61]
The brightness is controlled by adding a programmable setup
level onto the scaled Y data. This brightness level may be added
onto the scaled Y data. For NTSC with pedestal, the setup can
vary from 0 IRE to 22.5 IRE. For NTSC without pedestal and
PAL, the setup can vary from −7.5 IRE to +15 IRE.
The brightness control register is an 8-bit register. Seven bits of
this 8-bit register are used to control the brightness level. This
brightness level can be a positive or negative value.
§
¨
©
§
¨
©
. 0
. 0
17578125
17578125

4
4
·
¸
¹
·
¸
¹


128
128
105
105
d
d
d
x 0
x 0
− 128) for positive hue
97
69
.
Rev. PrA | Page 52 of 88
For example,
1. To add +20 IRE brightness level to an NTSC signal with
pedestal , write 0x28 to Address 0x61, SD brightness.
2. To add –7 IRE brightness level to a PAL signal, write 0x72 to
Address 0x61, SD brightness.
Table 32. Brightness Control Values
Setup Level In
NTSC with
Pedestal
22.5 IRE
15 IRE
7.5 IRE
0 IRE
1
Values in the range from 0x3F to 0x44 might result in an invalid output
signal.
0x[ SD Brightness Value ] =
0x[ IRE Value × 2.015631] =
0x[20 × 2.015631] = 0x[40.31262] = 0x28
[ IRE Value| × 2.075631
[7 × 2.015631] = [14.109417] = 0001110 b
[0001110] into twos complement = [1110010] b = 0x72
Setup Level In
NTSC No
Pedestal
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
Preliminary Technical Data
1
Setup
Level In
PAL
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
SD
Brightness
0x1E
0x0F
0x00
0x71