LM98620 eval board schematic

syed hamad

Expert 1120 points

Other Parts Discussed in Thread: LM98620, SENSOREVAL

Dear Tiers,

One of our customer finalized to use TI LM98620 ADC for the CCD frontend.

The datasheet refers to development board schematics & layout (page 59 & 64) for guidelines.

Can anyone please share the schematics for LM98620 evaluation board.

regards,

syed

over 8 years ago

0 Hooman Hashemi over 8 years ago

TI__Mastermind 22825 points

Hi Syed,

1) Here is the LM98620 bench board documentation (Board / Gerber files, schematic, floor plan, BOM). Note that the LM98620 uses the LM98618 bench testing board (Note: The board is not available for sale or demo to customer).

• LM98620 Bench Board 012770_r2 Hooman_2_25_16 link (click here)

2) Here is the SensorEval installation file, and instructions, including an LM98620 register file example (*.dat), for your reference:

• SensorEval 1.1.5 AFE link (click here)

Please let me know if you have any questions.

Regards,

Hooman

0 syed hamad over 8 years ago in reply to Hooman Hashemi

Expert 1120 points

Thanks a lot Hooman.

regards,
syed

0 syed hamad over 7 years ago in reply to syed hamad

Expert 1120 points

HI Hooman,

Is there any specific sequence to be followed for LM98620 register programming.
Datasheet does not mention anything about it.
If there is any sample drive available, that would be great.

regards,
syed

0 Hooman Hashemi over 7 years ago in reply to syed hamad

TI__Mastermind 22825 points

Hi Syed,
Sorry about the delay. I hope to get back to you by tomorrow.

Regards,
Hooman

0 Hooman Hashemi over 7 years ago in reply to Hooman Hashemi

TI__Mastermind 22825 points

Hi Syed,
The LM98620 registers can be written in order from lowest to highest address. No other special sequence is required. After the initial configuration is done, then changes or trigger commands can be sent to enable specific black/white calibration features as needed.

Regards,
Hooman

0 Prasanna Ganapathi over 7 years ago in reply to Hooman Hashemi

Prodigy 100 points

Hi Hooman,

What is the timing for generating CLPIN & BLKCLP. Is it during the light shield output (blanking period) from sensor.

I have attached the timing chart of the CCD sensor I am using.

Regards,

Prasanna

0 Jim Brinkhurst1 over 7 years ago in reply to Prasanna Ganapathi

TI__Mastermind 43930 points

Hi Prasanna

Yes, the CLPIN and BLKCLP inputs should be asserted during the Light shield output pixels.

Please refer to Figure 21 and Figure 24 and related text descriptions in the LM98620 datasheet.

Best regards,

Jim B

0 Prasanna Ganapathi over 7 years ago in reply to Jim Brinkhurst1

Prodigy 100 points

Hi Jim,

Thanks for your reply.
At present I have configured the AFE sample timing to SH1a mode. I have following questions
1. Do I have to still configure the DLL (position & width) or leave it at default values.
2. Do I have to provide external SHD/HOLD & SHP/SAMPLE or always drive them Low.

Regards
Prasanna

0 Jim Brinkhurst1 over 7 years ago in reply to Prasanna Ganapathi

TI__Mastermind 43930 points

Hi Prasanna

For SH1a mode you can leave the DLL sample position settings at defaults.

You do not need to drive the SHD/HOLD or SHP/SAMPLE inputs. The sample and hold timing is driven from AFEPHASE internal timing signal.

I recommend you use a Pixel Rate input clock. Then the internal AFEPHASE timing is determined by the input clock and no other external timing signal is required.

Best regards,

Jim Bg

0 Mohammed Abuhendi over 7 years ago in reply to Hooman Hashemi

Prodigy 60 points

Can Hooman or anyone else re-share the schematics for LM98620 evaluation board?

Best regards.

0 Hooman Hashemi over 7 years ago in reply to Mohammed Abuhendi

TI__Mastermind 22825 points

Hello,

Here is the LM98620 EVM schematic and layout information:

1321.3580.0131.LM98620 EVM.zip

Note: The files containing "Des" in their file names are the deserializer portion connected to the LM98620 EVM output through a "daughter" board using J19 connector (on the LM98620 board) and J5 on the daughter board.

7/28/16: Note: Added BOM files to the zip file above.

1/12/17: Note: Added Gerber-like files in new folder labelled "Gerber Files 1_12_17"

Regards,

Hooman

0 Mohammed Abuhendi over 7 years ago in reply to Hooman Hashemi

Prodigy 60 points

Thank you very much Hooman, you are a lifesaver!
I need to ask for the BOM file (I could not find it in the RAR file), and of course the SensorEval software.

Thank you in advanced.

0 Hooman Hashemi over 7 years ago in reply to Mohammed Abuhendi

TI__Mastermind 22825 points

Hi,

I've added the two board BOM's to the original zip file (posted on July 25, 2016).

The SensorEval software can be downloaded off the web here:

Regards,

Hooman

0 Mohammed Abuhendi over 7 years ago in reply to Hooman Hashemi

Prodigy 60 points

Hello

thank you Hooman I find it in the updated file.

Best regards

0 Hooman Hashemi over 7 years ago in reply to Hooman Hashemi

TI__Mastermind 22825 points

Hello,

I've been told that there may be issues with using the SensorEval web installation file with the LM98620 (or LM98xxx devices in general).

Here is the installation file (along with instructions) of the version 1.1.5 that I run on my Windows 7 machine and it works:

SensorEval 1.1.5 AFE.zip

Regards,

Hooman

0 Mohammed Abuhendi over 7 years ago in reply to Hooman Hashemi

Prodigy 60 points

Hello,
Thank you again for your concern.
I need to ask you about the Gerber files, can you share them?
and if it possible to share the original schematic files in any format like (Eagle, Altium, Orcad).
thank you in advance for your cooperation.

Best regards.

0 Hooman Hashemi over 7 years ago in reply to Mohammed Abuhendi

TI__Mastermind 22825 points

Hello,

I'm sorry but I don't have the EVM Gerber files (*.gbr extension) or the source schematics.

I will ask other colleagues available next week, and if I am able to locate these, I'll post them to this thread.

Regards,

Hooman

0 Mohammed Abuhendi over 7 years ago in reply to Hooman Hashemi

Prodigy 60 points

Hello Hooman,

Any good news?

I really in need for the EVM Gerber files or the source schematics, so please if it possible share them.

Regards

0 Hooman Hashemi over 7 years ago in reply to Mohammed Abuhendi

TI__Mastermind 22825 points

Hi Mohammed,

I'm currently not in my office. I'll get back on Wednesday and I'll look to get you the gerber files you've asked for.

Regards,

Hooman

0 Mohammed Abuhendi over 7 years ago in reply to Hooman Hashemi

Prodigy 60 points

Hi Hooman,

thank you in advance.

Regards.

0 Hooman Hashemi over 7 years ago in reply to Mohammed Abuhendi

TI__Mastermind 22825 points

Hi Mohammed,

I've uploaded whatever I had on this EVM that resembles Gerber files in the original location zip file:

3580.0131.LM98620 EVM.zip

Hopefully this is what you are looking for?

Sorry, I don't have anything else if this is not what you want.

Regards,

Hooman

0 Prasanna Ganapathi over 7 years ago in reply to Jim Brinkhurst1

Prodigy 100 points

Hi Jim,

1. When using black level calibration (automatic method), CDAC and FDAC enable mode should be used after power up calibration and FDAC only mode during normal scan operation. Is my understanding correct. Can Auto black loop Enable in register BLKCLP_CTL0 (0x23 bit 2) kept HIGH always.

2. When using white level calibration (automatic gain control), AGC_ON bit in register AGC_CONFG (0x28 bit 0) is set using serial interface(AGC_ONB is always HIGH. AGC_ONB polarity selected as active low). Should we write AGC_ON LOW from serial interface after white loop is complete or will it get cleared automatically after white loop is complete.

Regards

Prasanna

0 Prasanna Ganapathi over 7 years ago in reply to Prasanna Ganapathi

Prodigy 100 points

Hi Hooman,

Can you please clarify my above questions.

Regards

Prasanna

0 Prasanna Ganapathi over 7 years ago in reply to Prasanna Ganapathi

Prodigy 100 points

Hi,

Can anyone please help.

Regards

Prasanna

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LM98620 eval board schematic