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PYTHON480 データシート(PDF) 31 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 31 Page - ON Semiconductor |
31 / 69 page PYTHON 480 www.onsemi.com 31 Black Reference The sensor reads out one or more black lines at the start of every new frame. The number of black lines to be generated is programmable and is minimal equal to 1. The length of the black lines depends on the operation mode. The sensor always reads out the entire line (404 kernels), independent of window configurations. The black references are used to perform black calibration and offset compensation in the data channels. The raw black pixel data is transmitted over the usual output interface, while the regular image data is compensated (can be bypassed). On the output interface, black lines can be seen as a separate window, however without Frame Start and Ends (only Line Start/End). The Sync code following the Line Start and Line End indications (“window ID”) contains the active window number, which is 0. Black reference data is classified by a BL code. Reference Lines The sensor optionally reads out one or more reference lines after the black lines. The number of reference lines to be generated is programmable. No reference lines shall be generated when set to 0. As for the black lines, the length of the reference lines depends on the operation mode. The reference lines are not used internally in the sensor. The ROT for these lines can be configured such that these lines contain particular reference data, such as a grey level, in order to perform PRNU correction off−chip. Reference lines are indicated on the output interface by means of a dedicated Sync pattern (REF). The black calibration block can be configured to either perform black level correction and compression or not. In the latter case, the LSB is discarded from the ADC word. Optionally, the black level calibration processor can be configured to transmit the average black level on the reference lines. In this mode, the reference pixel data are replaced by the average black level, as calculated by the black calibration block. Channel differences can easily be observed in this mode (See register reg_db_ref_bcal_enable). Signal Path Gain Analog Gain Stages Referring to Table 20, three gain settings are available in the analog data path to apply gain to the analog signal before it is digitized. The gain amplifier can apply a gain of approximately 1x to 3.5x to the analog signal. The moment a gain reconfiguration is applied and becomes valid can be controlled by the gain_lat_comp configuration. With ‘gain_lat_comp’ set to ‘0’, the new gain configurations are applied from the very next frame. With ‘gain_lat_comp’ set to ‘1’, the new gain settings are postponed by one extra frame. This feature is useful when exposure time and gain are reconfigured together, as an exposure time update always has one frame latency. Table 20. SIGNAL PATH GAIN STAGES Address Gain Setting Gain Stage 1 (204[4:0]) Gain Stage 2 (204[12:5]) Overall Gain 204[12:0] 0x00E1 1 1 1 204[12:0] 0x00E4 2 1 2 204[12:0] 0x0024 2 1.75 3.5 NOTE: The sensor performance specifications are tested at unity gain. Analog gain above 2x affects noise performance. All other gains settings shown in this table are tested for sensor functionality only. Digital Gain Stage The digital gain stage allows fine gain adjustments on the digitized samples. The gain configuration is an absolute 5.7 unsigned number (5 digits before and 7 digits after the decimal point). |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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