參數(shù)資料
型號(hào)： ADV7343BSTZ
廠商： Analog Devices Inc
文件頁數(shù)： 64/108頁
文件大小： 0K
描述： IC ENCODER VIDEO W/DAC 64-LQFP
產(chǎn)品變化通告： ADV734x, ADV739x Feature Improvement
標(biāo)準(zhǔn)包裝： 1
類型： 視頻編碼器
應(yīng)用： DVD，Blu-Ray
電壓 - 電源，模擬： 3.3V
電壓 - 電源，數(shù)字： 1.8V
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
Data Sheet
ADV7342/ADV7343
Rev. | Page 59 of 108
SD LUMA AND COLOR SCALE CONTROL
Subaddress 0x9C to Subaddress 0x9F
When enabled, the SD luma and color scale control feature can
be used to scale the SD Y, Cb, and Cr output levels. This feature
can be enabled using Subaddress 0x87, Bit 0. This feature affects
all SD output signals, that is, CVBS, Y-C, YPrPb, and RGB.
When enabled, three 10-bit registers (SD Y Scale, SD Cb scale,
and SD Cr scale) control the scaling of the SD Y, Cb, and Cr
output levels. The SD Y scale register contains the scaling factor
used to scale the Y level from 0.0 to 1.5 times its initial level.
The SD Cb scale and SD Cr scale registers contain the scaling
factors to scale the Cb and Cr levels from 0.0 to 2.0 times their
initial levels, respectively.
The values to be written to these 10-bit registers are calculated
using the following equation:
Y, Cb, or Cr Scale Value = Scale Factor × 512
For example, if Scale Factor = 1.3
Y, Cb, or Cr Scale Value = 1.3 × 512 = 665.6
Y, Cb, or Cr Scale Value = 666 (rounded to the nearest integer)
Y, Cb, or Cr Scale Value = 1010 0110 10b
Subaddress 0x9C, SD scale LSB register = 0x2A
Subaddress 0x9D, SD Y scale register = 0xA6
Subaddress 0x9E, SD Cb scale register = 0xA6
Subaddress 0x9F, SD Cr scale register = 0xA6
It is recommended that the SD luma scale saturation feature
(Subaddress 0x87, Bit 1) be enabled when scaling the Y output
level to avoid excessive Y output levels.
SD HUE ADJUST CONTROL
Subaddress 0xA0
When enabled, the SD hue adjust control register (Subaddress
0xA0) is used to adjust the hue on the SD composite and chroma
outputs. This feature can be enabled using Subaddress 0x87, Bit 2.
Subaddress 0xA0 contains the bits 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 ADV7342/ADV7343 provide a range
of ±22.5° in increments of 0.17578125°. For normal operation
(zero adjustment), this register is set to 0x80. Value 0xFF and
Value 0x00 represent the upper and lower limits, respectively, of
the attainable adjustment in NTSC mode. Value 0xFF and Value
0x01 represent the upper and lower limits, respectively, of the
attainable adjustment in PAL mode.
The hue adjust value is calculated using the following equation:
Hue Adjust (°) = 0.17578125° (HCRd 128)
where HCRd is the hue adjust control register (decimal).
For example, to adjust the hue by +4°, write 0x97 to the hue
adjust control register.
97
x
0
151
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 control
register.
9
6
x
0
105
128
17578125
.
0
4
=
≈
+
d
where the sum is rounded to the nearest integer.
SD BRIGHTNESS DETECT
Subaddress 0xBA
The ADV7342/ADV7343 allow monitoring of the brightness
level of the incoming video data. This feature is used to monitor
the average brightness of the incoming Y signal on a field-by-
field basis. The information is read from the I2C and, based on
this information, the color saturation, contrast, and brightness
controls can be adjusted (for example, to compensate for very
dark pictures).
The luma data is monitored in the active video area only. The
average brightness I2C register is updated on the falling edge of
every VSYNC signal. The SD brightness detect register (Subad-
dress 0xBA) is a read-only register.
SD BRIGHTNESS CONTROL
Subaddress 0xA1, Bits[6:0]
When this feature is enabled, the SD brightness/WSS control
register (Subaddress 0xA1) is used to control brightness by
adding a programmable setup level onto the scaled Y data. This
feature can be enabled using Subaddress 0x87, Bit 3.
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 SD brightness control register is an 8-bit register. The seven
LSBs of this 8-bit register are used to control the brightness
level, which can be a positive or negative value.
For example, to add a +20 IRE brightness level to an NTSC
signal with pedestal, write 0x28 to Subaddress 0xA1.
0 × (SD Brightness Value) =
0 × (IRE Value × 2.015631) =
0 × (20 × 2.015631) = 0 × (40.31262) ≈ 0x28
D
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ADV7343WBSTZ 功能描述:IC ENCODER VID 12BIT DAC 64LQFP 制造商:analog devices inc. 系列:- 包裝:托盤 零件狀態(tài):在售 類型:視頻編碼器 應(yīng)用:DVD，Blu-Ray 電壓 - 電源，模擬:2.6 V ~ 3.46 V 電壓 - 電源，數(shù)字:1.71 V ~ 1.89 V 安裝類型:表面貼裝 封裝/外殼:64-LQFP 供應(yīng)商器件封裝:64-LQFP（10x10） 標(biāo)準(zhǔn)包裝:1
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