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參數(shù)資料
| 型號： | ADV7321KSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 47/88頁 |
| 文件大小： | 0K |
| 描述： | IC VID ENC 6-12BIT DAC'S 64LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 視頻編碼器 |
| 應(yīng)用： | EVD，DVD，SD/PS/HDTV |
| 電壓 - 電源，模擬： | 2.5V |
| 電壓 - 電源，數(shù)字： | 2.5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-LQFP |
| 供應(yīng)商設(shè)備封裝： | 64-LQFP（10x10） |
| 包裝： | 托盤 |
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ADV7320/ADV7321
Rev. A | Page 51 of 88
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, that is, 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 provide 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 attainable
adjustment.
Hue Adjust (°) = 0.17578125° (HCRd 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
.
0
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
.
0
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 can 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] = 0001110b
[0001110] into twos complement = [1110010]b = 0x72
Table 32. Brightness Control Values1
Setup Level in
NTSC with
Pedestal
Setup Level in
NTSC Without
Pedestal
Setup
Level in
PAL
SD
Brightness
22.5 IRE
15 IRE
0x1E
15 IRE
7.5 IRE
0x0F
7.5 IRE
0 IRE
0x00
0 IRE
–7.5 IRE
0x71
1 Values in the range of 0x3F to 0x44 might result in an invalid output
signal.
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