CCD-world: RE: About THOMSON TH7899 2048 & Marconi

[Paul.Jorden at eev.com]

The following was posted to CCD-world:

Frank, et al,
 >
 > Could You please advise me which of Your backilluminated CCD (1kx1k or
 > 2kx2k) are able to be clocked as fast as Zhao wants. We are very
 > interested in fast backilluminated CCD but Your distributor could not
 > explain which are good for fast clocking and which performance they
 > achieve in this mode (2 -10 Mhz, readout frequency). We use the 2k
 > x2k TH CCD and we are pleased with the quality.

The CCD42-40 is 2k&2k with 13.5 um pixels, non-IMO,  and backthinned for high QE, with low noise.  Although it may have a lower serial clocking speed than the TH chip, the provision of a dump drain means that it in not necessary to do a serial row scan during the clear cycle.  Thus time to clear the chip is defined by the row clocking rate; row transfer time is ~ 20 uS for full well. [less than full-well signals will transfer faster]
The serial clocks will go at 10 MHz, although <~ 1 Mhz is normal for signal sampling.

There is also a CCD47-10 (1k*1k, 13 um pixels, full-frame) and the CCD47-20 (1k*1k, 13 um, FT).  These have a row transfer rate of ~ 2 uS.  They also have a dump drain to allow fast clearing.  My sums say that a chip could easily be cleared in 10 mS.

Note that backthined, IMO (MPP) devices can have slower clocking rates than quoted above.

Regards,
Paul
_______________________________________________________________
Please note change of name from 'EEV' to  'Marconi Applied Technologies'.
_______________________________________________________________
Dr Paul Jorden,  CCD Sensors, Marconi Applied Technologies
Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK
Tel:      44 (0) 1245 -453458 (direct), -493493 (switchboard)
Fax:      44 (0) 1245 453224
http://www.marconi-technologies.co.uk/products/ccd/ccdprod.html


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