MN86157 Datasheet (Panasonic Semiconductor)

MN86157, Shading Correction LSI

of each block.

(1) A/D converter This uses comparison with the reference voltages to convert the scanner's image data signal from the VIN pin to a 7-bit digital output.

(2) Distortion coefficient mapping ROM This constitutes a look-up table for converting the A/D converter output to a final value f

For Communications Equipment MN86157 Shading Correction LSI Overview The MN86157 contains a 7-bit A/D converter for use in correcting, at the bit level, shading distortion for signals from image sensors, optics, and similar sources.

It uses external RAM to support adaptive correction that responds to changes in distortion patterns.

It also uses ROM to provide fixed correction when a white reference plane signal is not available.

The chip is also usable as a stand-alone A/D converter.

Pin Assig

MN86157 Features

* Choice of correction range (50% or 75%) depending on extent of shading distortion Parallel A/D converter functions Resolution: 7 bits Non-linearity: ± 1/2 LSB Conversion speed: max. 5 MHz Note: This is the guaranteed design value for the chip used as a stand-alone A/D converter. The guaranteed value