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參數(shù)資料
| 型號： | TLV977-10CPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 289K |
| 代理商： | TLV977-10CPFB |
TLV977-10
3-V, 10-BIT, 21 MSPS, AREA CCD SENSOR PROCESSOR
SLAS229 – AUGUST 1999
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
automatic optical black and offset correction (continued)
After the auto-calibration is complete, the ADC’s digital output during CCD signal interval can be expressed by
the following equation,
ADC output [D9 – D0] = CCD_input
× PGA gain + Vb,
Where: Vb is the desired black level selected by user.
The total offset including optical black offset is calibrated to be equal to the Vb by adjusting the offset correction
DACs during the auto-calibration.
The number of black pixels in each line and number of lines are programmable. The number of black pixels per
line that can be averaged equals to 2N , where N can be 0, 1, 2, 3, 4, 5, and 6. The number of lines equals to
2L , where L can be 0, 1, 2, 3, 4, 5, 6, 7, and 8.
The auto-calibration feature can be bypassed if the user prefers to directly program the offset DAC registers.
Switching the auto-calibration mode to the direct programming mode requires two register writes. First, the
control bits for the offset DACs in the control register needs to be changed then desired offset value for the
register is loaded to the offset DAC registers for proper error correction. If the total offset including optical black
level is less than
±255 ADC LSBs, only the FDAC needs to be programmed. When switching from the direct
programming mode to the auto-calibration mode, the previous DAC register values are used as starting offsets
rather than default DAC register values.
A detailed block diagram for the internal automatic optical black and offset correction is shown in Figure 4. The
timing diagram in Figure 5 illustrates the operation of the calibration system. In the example, the TLV977-10 is
programmed to average four black pixels (N=2) per line for two lines (L=1).
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