They require 2 or 3 voltage supplies as well as additional support chips to drive control and shift the pixel data off the chip. The output of these devices is an analog voltage for each pixel. This requires an additional chip to provide gain and convert analog voltages to a digital stream.
Pixel sensitivity is generally quite good and defects are small and few.
The array must be read out in its entirety without skipping pixels, rows or columns. It can scan in a variety of modes and directions, and even perform analog-domain preprocessing of the signal where advantageous from the system perspective. Although the greater pixel circuit complexity results in a larger imager today, great progress is being made towards both shrinking the geometry of the pixel and using more aggressive design rules. The result is a family of sensors, which provide both cost reductions and performance enhancement paths to the system designer. The ZR732112 is an 'Evaluation Board Kit' for developer's to determine the suitability of this device for their application.