Wednesday, December 01, 2021

BAE Presents 12MP 240fps APS-C Sensor

BAE (Fairchild Imaging) presents 12MP 240fps APS-C sensor LTN4625A with global and rolling shutter modes:


  1. In GS mode, I think the noise will be very high. And there will be a large PLS. So, this GS will be useless. Just a rolling shutter sensor.

  2. Why the noise in GS might be high?

    1. Albert Theuwissen - Harvest ImagingDecember 2, 2021 at 3:22 PM

      Because this pixel does not allow you to perform an optimized CDS in GS mode to cancel the kTC noise. There do exist some trainings and courses about these kind of topics ;-)

    2. Professor, there is also the possibility to do an off-chip CDS. :)

    3. Albert Theuwissen - Harvest ImagingDecember 3, 2021 at 10:50 AM

      That is also part of that training I was referring to ;-)

  3. They presented this sensor in early 2015:
    and here

    What is the news now, something changed? I did see that the power then was 2.0W, now 5.0W.

    1. The LTN4625A flyer is dated by November 2021. Maybe they decided to make this sensor an off-the-shelf product available to everybody since last month.

    2. No, it was also ots available at that moment. Was also on the Vision Show at that time.
      But I see now, it is a new flyer with BAE template instead of Fairchild.
      old flyer

    3. Thanks. It's interesting to compare the old and new flyers:

      Old: rolling and global shutters
      New: same and also global reset/rolling readout

      Power consumption: old - 2W at 60fps, new - 5W at 60fps

      RS noise: old - 2e- rms, new - 1.5e- rms

      It appears the sensor went through some design iterations over the years

  4. The sensor was indeed ready 5+ years ago, but then a broadcast company that makes cheapo wannabe cinema cameras secured exclusivity for it, so that they can deliberately cripple it - initially promising the GS mode and before shipping they cancelled the GS mode. But even in 60p RS (25% of the sensor capabilities), the performance of this sensor is pretty poor and strong FPN is visible - I believe that is due to the separate LG/HG paths and troublesome tonemapping. Later, a 120p RS gen2 camera was released, still under-utilising the sensors capabilities.

    The main issue though is, that those cameras were sold almost for the list price of this sensor, and today you can get such camera for about quarter of the price of the sensor.

    Some things are really messed up in this world.


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