EVAL-ADV7320EB AD [Analog Devices], EVAL-ADV7320EB Datasheet - Page 51

• Manufacturer Part Number: EVAL-ADV7320EB
• Description: Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
• Manufacturer: AD [Analog Devices]

SD Hue Adjust Value
[Subaddress 0x60]
The hue adjust value is used to adjust the hue on the composite
and chroma outputs.
These eight bits represent the value required to vary the hue of
the video data, i.e., the variance in phase of the subcarrier
during active video with respect to the phase of the subcarrier
during the color burst. The ADV7320/ADV7321 provides a
range of ±22.5° 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
for 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, which
can be a positive or negative value.
⎛
⎜
⎝
⎛
⎜
⎝
. 0
. 0
17578125
17578125
−
4
4
⎞
⎟
⎠
⎞
⎟
⎠
+
+
128
128
=
=
105
105
d
d
=
=
x 0
x 0
d
− 128) for positive hue
97
69
.
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For example,
1. To add +20 IRE brightness level to an NTSC signal with
2. To add –7 IRE brightness level to a PAL signal, write 0x72 to
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 of 0x3F to 0x44 might result in an invalid output
signal.
pedestal, write 0x28 to Address 0x61, SD brightness.
Address 0x61, SD brightness.
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
ADV7320/ADV7321
1
Setup
Level In
PAL
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
SD
Brightness
0x1E
0x0F
0x00
0x71