Need for maximum speed

Alessandro Cominelli

Other Parts Discussed in Thread: DLPNIRNANOEVM, DLP7000, DLPC410, DLPA200

Hi,

I am new to DLP technology and I have an answer about the maximum speed I can achieve.

I want to use a DLP to build a fast spectrometer in the visible range. To do it I would like to use a grating to divide light in different wavelengths, each one directed to a different column of the DLP mirror array. Then I want to activate only a row at a time at the fastest possible speed. To understand the maximum speed I can achiev with a DLP-based solution I need to know how the digital programming of the DLP works: does the controller sends a command for each mirror pixel using a serial communication? (in this case I think the maximum speed I can achieve to change from one configuration to another is relatively low, since I have to wait that all pixels are addressed). Or is it possible to control only a couple of rows and leave all other pixel unchanged to maximize speed?

Can you suggest me the fastest solution you have available for my problem?

Thank you for your time,

Best regards,

Alessandro Cominelli

over 6 years ago

0 Kyle Rakos over 6 years ago

TI__Mastermind 20045 points

Hello Alessandro,

Thank you for your interest in DLP® technology. You will see how a DLP chipset works together to control the DMD. If you then scroll down to the "Advanced Light Control" section you can see our DMDs and controllers that are intended for high speed applications with precise control requirements. The controllers have various features to enable addressing the DMD in various manners.

You may specifically be interested in the DLPNIRNANOEVM which is used for spectroscopy at http://www.ti.com/tool/dlpnirnanoevm.

Take a look at them and let us know if you have any questions. Specifically feel free to let us know your frame rate and wavelength requirments.

Thanks,
Kyle

0 Alessandro Cominelli over 6 years ago in reply to Kyle Rakos

Intellectual 375 points

Thank you for your quick answer.

I saw on your website that you have fast solutions, like DLP7000, which can reach a rate up to 32kHz.

I also saw from the darasheet that many DMD operations are possible: single block, dual block, ...

I was wondering if it is possibile tu use only a bank of the dmd (letting all the others off) to increase the frame rate at the expense of a lower effective number of rows. Is it possibile in this case to reach 32*16kHz rate?

Thank you for your time

Best regards,

Alessandro Cominelli

0 Kyle Rakos over 6 years ago in reply to Alessandro Cominelli

TI__Mastermind 20045 points

Hello Alessandro,

Let me pass you off to a member on the team supporting the higher frame rate platforms and they will get back to you here.

Thanks,

Kyle

0 Alessandro Cominelli over 6 years ago in reply to Kyle Rakos

Intellectual 375 points

Hi,

Do you have any news about my question?

Thank you,

Alessandro Cominelli

0 Fizix over 6 years ago in reply to Alessandro Cominelli

TI__Guru 54350 points

Hello Alessandro,

for the DLP7000, you can use a subset of the rows (1/16th = 48 rows), but since the mirrors are mechanical there is still a mechanical settling time that cannot be bypassed. This time is about 12 - 13 µs + about 2 µs to load the data in that block of 48 rows. Therefore the fastest speed would be about 70 kHz.

Fizix

0 Frank L over 6 years ago in reply to Fizix

Prodigy 190 points

Hello Fizix,

I had the understanding that for some reasons the pattern rate should not exceed 50 kHz.

This number comes from DLPC410 data sheet section 8.4.3.5 Timing Requirements for LOAD4

http://www.ti.com/document-viewer/DLPC410/datasheet/timing-requirements-for-load4-dlps0247854#DLPS0247854

Can you explain, please?

Thanks - Frank

0 Fizix over 6 years ago in reply to Frank L

TI__Guru 54350 points

Frank,

You are correct. I should have made it clear that if you do run at 70 kHz it will be outside the rating of the DLPA200. What I was attempting to communicate is that it is still far below the 32*16 kHz = 512 kHz that you were inquiring about.

If you run the DLPA200 at 70 kHz it will be outside the recommended operating conditions and therefore cannot be guaranteed to continue to operate.

Fizix

0 Frank L over 6 years ago in reply to Fizix

Prodigy 190 points

Hi Fizix,

ok, I understand. Thanks for clarification.

Best Regards

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Need for maximum speed