MAX232D datasheet pdf datenblatt

In general, the frame transfer pulse output from the CCD drive circuit, the frequency of direct impact on the size of CCD sensor integration time. The smaller frame transfer frequency, the sensor integration time longer, and IC MAX232D and accordingly, CCD sensor the longer the exposure time, the photosensitive element to capture the more the amount of light. When the frame transfer rate is too small, the resulting photosensitive optical unit charge will reach over saturation, the output of the analog voltage peak will exceed the required range. On the contrary, the analog output voltage peak will be lower than the required range. Therefore, we can design a CCD output voltage peak sampling hold circuit, then this peak value of the A / D conversion, while with the required range for comparison. When it is out of range values, the transfer can increase the frame rate; and when its value is lower than the range, you can reduce the frame transfer frequency [2].

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