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參數資料
| 型號： | THS8083CPZP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | POWER, THERMALLY ENHANCED, PLASTIC, TQFP-100 |
| 文件頁數： | 15/61頁 |
| 文件大小： | 266K |
| 代理商： | THS8083CPZP |
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2–8
2.7
Output Formatter
This block enables either a 4:4:4 24-bit output or 4:4:4 48-bit output at half the pixel clock or a 4:2:2 16-bit output,
useful for YUV digitizing (ITU.BT-601 style). In the latter case, an 8-bit port is used for the Y output, while a second
8-bit port is used alternately for Cr and Cb. As per ITU BT-601, Cb is the first video data word for each line, as shown
in Figure 2-7.
The first color sample after an incoming HS will be Cb. The output signal DHS is synchronized to the first pixel of a
line and can therefore be used to uniquely identify Cb from Cr output data in downsampled modes.
Cb
Cr
Cb
Cr
Cb
YY
Y
2 Channels
3 Channels
Cr (R-Y or V)
Cb (or B-Y or U)
Sampling Format
Y
X
Y
on Ch1 Bus A
Output
on Ch2 Bus A
Output
Other Outputs HI-Z
Output Format
t
Figure 2–7. Output Formatter
2.8
Power Down
In the I2C power-down register, four power down modes are defined:
Chip power down: PWDN_ALL
When PWDN_ALL=1, all analog circuits are powered down except the internal bandgap reference, the
circuit that generates the clamping voltages and the sync reference voltage. All these are kept active for
the composite sync slicer that remains active during power down. The clock frequency of the digital circuitry
will be lowered to reduce power consumption when in power down.
Internal reference power down: PWDN_REF
When PWDN_REF=1, bottom and top references (VREFB, VREFT) on all channels become inputs and
should be driven from external.
Bandgap reference power down: PWDN_BGAP
When PWDN_BGAP=1, the internal bandgap reference voltage is inactive and terminal VMID should be
driven from external.
DTO power down: DTO_DIS
When DTO_DIS=1, the DTO frequency is lowered to reduce power dissipation. When an external sampling
clock is used (EXT_ADCCLK), this power down can be activated.
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