tardfs
commented
13 years ago Леша, привет, я тут себе голову уже сломал
Существует три способа организации сенсора с точки зрения технологии. CCD CIS и FPA(Focal plane array). у нас насколько я понимаю именно FPA.
это из статьи Analog Devices: http://www.analog.com/library/analogDialogue/archives/34-06/imaging/index.html AFEs designed to work with charge-coupled devices (CCDs) use a correlated double sampler (CDS). The CDS takes two samples of each pixel, one at the reset level and one at the video level, and performs a differential measurement between the two. The CDS improves the signal to noise ratio (SNR) by eliminating the correlated kT/C noise associated with the output stage of the CCD, and by attenuating low frequency drift. Contact image-sensors (CIS) and focal-plane arrays (FPA) used in commercial infrared (IR)-imaging applications typically output a single-ended, ground-referenced signal, and do not require a differential measurement. AFEs designed to work with these sensors use a sample-hold amplifier (SHA) in place of the CDS. A coarse black-level offset-correction stage is integrated with the CDS or SHA.
CDS - correlated double sampler - нужен только для CCD матриц. его можно программно отключить ( CDS bypass) и тогда входное напряжение может быть другим!
В даташите надо смотреть раздел SHA mode стр 21. Короче надо писать в analog devices письмо с вопросом:
Is it possible to connect AD9978A device to focal plane array sensor with output signal 0.4...2.4v? or should I use another analog front end ?
nee to read AD paper deeply