M. Campbell et al., DEVELOPMENT OF A PIXEL READOUT CHIP COMPATIBLE WITH LARGE-AREA COVERAGE, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 342(1), 1994, pp. 52-58
A second version of the Omega pixel readout chip has been developed in
order to make it compatible with large area coverage. Specific featur
es of the new chip include a reset which can be applied immediately fo
llowing a ''false'' trigger, an improved minimum strobe time of approx
imately 100 ns, a readout clock rate of approximately 20 MHz and tri-s
tate buffers on the output data lines. The excellent performance figur
es of the first chip for noise (100 e- rms without detector and 170 e-
rms with detector) and power consumption (30 muW/pixel) have been mai
ntained. We demonstrate how with solder bump-bonding we can create hyb
rid ''ladders'' which hermetically cover an area of approximately 5 mm
X 50 mm. Potential problems of electrical matching and yield have bee
n addressed and procedures are in place for selecting only ''good'' re
adout chips for mounting.