LS4k line scan image sensor

The LS4k is a high speed CMOS System on Chip (SoC) line scan image sensor optimized for applications requiring short exposure times and high accuracy line rates. It incorporates on chip two pixel arrays consisting of 2 rows with 4,096 7μm pitch pixels and 4 rows with 2,048 14μm pitch pixels respectively, a high accuracy (12-bit) high speed (84MHz) analog-to-digital conversion (ADC), and sophisticated on chip optical calibration for PRNU, DSNU, and lens shading correction.

The line sensor array utilizes active CMOS pixels with pinned photodiodes to deliver high image quality whilst maintaining size, cost, and integration advantages of the CMOS process. The readout path permits pixel binning, increasing response and line rate. Windowing or sub-sampling allows a maximum line rate of 82,400 lines per second (lps) for 512-pixel window to be achieved.

The line rate, image sub-sampling, windowing, binning, exposure time, gain, and other image processing features are controlled via the sensor configuration registers. The LS4k incorporates an SPI port to communicate with an external host device and three high speed LVDS ports for data output. The reference voltages are generated on chip from an internal band gap reference. No external components are required and a power down mode is available for low current consumption when the device is inactive.

Typical applications

  • Printed circuit board inspection
  • High performance document scanning
  • Flat panel display inspection
  • General machine vision & food sorting
  • OCT, medical