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參數(shù)資料
| 型號： | THS8200PFPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | GREEN, PLASTIC, HTQFP-80 |
| 文件頁數(shù)： | 52/101頁 |
| 文件大?。?/td> | 806K |
| 代理商： | THS8200PFPG4 |
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4–39
The input code range of the Y channel is from 64 to 940, but the range of input codes of Cr and Cb is from 64 to 960.
350 mV
0 mV
Active Video Period
Blank Level
Analog
Output
Codes
to
DACs
960
512
700 mV
64
E’cr, E’cb
Analog Output of Cr and Cb Channels Without Sync Insertion
Blanking Interval
Figure 4–45. Analog Output of Cr and Cb Channels Without Sync Insertion
The blanking level of all channels is at 350 mV. Note that for the Pb and Pr output channels, there is no dc offset added,
so DAC input code 0 now corresponds to 0 V dc output. Whether or not offset is added to the DAC outputs is
determined from the setting of the dtg2_rgb_mode_on register.
4.8.5
SMPTE-Compatible YPbPr Output With Sync Signal Inserted on All Channels
In this mode, sync signals are inserted on all three channels Y, Cr, and Cb. The Y channel output is identical to that
of Section 4.8.4. The Pb and Pr channel outputs are shown below. The range of input codes to the Y channel is from
64 to 940. The range of input codes to the CrCb channels is from 64 to 960.
650 mV
350 mV
50 mV
0 mV
Active Video Period
Blank Level
Analog
Output
Codes
to
DACs
960
512
700 mV
896
64
128
E’cr, E’cb
Analog Output of Cr and Cb Channels With Sync Insertion
Blanking Interval
OH
Figure 4–46. Analog Output of Cr and Cb Channels With Sync Insertion
The ac dynamic range during the active video period is the same on all channels, 700 mV. This means that two
different code ranges are mapped to the same analog output range. Because three DACs in the THS8200 share a
common full-scale adjust resistor, therefore, different input codes to the DAC result in different analog outputs. In
order to map two code ranges into a same analog output, the input code range must be scaled in the CSM block.
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