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參數(shù)資料
| 型號： | ADV7321KSTZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs |
| 中文描述： | COLOR SIGNAL ENCODER, PQFP64 |
| 封裝： | LEAD FREE, PLASTIC, MS-026BCD, LQFP-64 |
| 文件頁數(shù)： | 51/88頁 |
| 文件大小： | 1002K |
| 代理商： | ADV7321KSTZ |
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ADV7320/ADV7321
SD Hue Adjust Value
[Subaddress 0x60]
Rev. 0 | Page 51 of 88
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
d
128) for positive hue
adjust value.
For example, to adjust the hue by +4°, write 0x97 to the hue
adjust value register:
97
x
0
105
128
17578125
.
4
=
=
+
d
.
where the sum is rounded to the nearest integer.
To adjust the hue by 4°, write 0x69 to the hue adjust value
register:
69
x
0
105
128
17578125
.
4
=
=
+
d
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.
For example,
1. To add +20 IRE brightness level to an NTSC signal with
pedestal, write 0x28 to Address 0x61, SD brightness.
0x[
SD Brightness Value
] =
0x[
IRE Value
× 2.015631] =
0x[20 × 2.015631] = 0x[40.31262] = 0x28
2. To add –7 IRE brightness level to a PAL signal, write 0x72 to
Address 0x61, SD brightness.
[
IRE Value| ×
2.075631
[7 × 2.015631] = [14.109417] = 0001110
b
[0001110]
into twos complement
= [1110010]
b
= 0x72
Table 32. Brightness Control Values
1
Setup Level In
NTSC with
Pedestal
Pedestal
22.5 IRE
15 IRE
15 IRE
7.5 IRE
7.5 IRE
0 IRE
0 IRE
–7.5 IRE
Setup Level In
NTSC No
Setup
Level In
PAL
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
SD
Brightness
0x1E
0x0F
0x00
0x71
1
Values in the range of 0x3F to 0x44 might result in an invalid output
signal.
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