DS90CR287: Output pulse position

NAOKI AOYAMA

Guru 11215 points

Part Number: DS90CR287
Other Parts Discussed in Thread: DS90C385A

Hello,

Our customer use the DS90CR287, have a question.

The customer want to know the output pulse position.

It is mentioned the spec of output pulse position with f=85MHz on the DS.

Could you tell me the value of the output pulse position with f= 57.5MHz, 54MHz and 27MHz?

Best Regards,

Naoki Aoyama

over 7 years ago

0 Yaser Ibrahim over 7 years ago

TI__Genius 10250 points

Hello,

The output pulse position for the first bit is the same (at 0 ns), then bit 1 is at (1/f)/7, bit 2 is at 2*(1/f)/7, bit 3 is at 3*(1/f)/7, and so on.

For f= 85 MHz, 1/f = 11.765 ns, bit1 is at (1/f)/7=1.68 ns, bit2 is at 2*11.765/7 = 3.36 ns, bit3 is at 3*11.765/7 = 5.04, ...etc.
For f=57.5MHz, 1/f = 17.39 ns, bit1 is at 17.39/7=2.48ns, bit2 is at 2*17.39/7 = 4.97ns, bit3 is at 3*17.39/7 = 7.45ns, ..etc
and so on...

Regards,
Yaser

0 NAOKI AOYAMA over 7 years ago in reply to Yaser Ibrahim

Guru 11215 points

Hello,

Thank you for your reply.
How about the variation of the output pulse position?
Of course, that values are not guarantee.

Regards,
Naoki Aoyama

0 Yaser Ibrahim over 7 years ago in reply to NAOKI AOYAMA

TI__Genius 10250 points

Hello Aoyama-san,

Unfortunately, we do not have that data for other frequencies. The variation will be higher for the lower frequencies. Please see DS90C385A datasheet to get an idea about the change in variation for different frequencies.

Regards,
Yaser

0 NAOKI AOYAMA over 7 years ago in reply to Yaser Ibrahim

Guru 11215 points

Hello Yaser-san,

Thank you for your reply.
I see.
I will suggest the customer using DS90C385A.

Thanks,
Naoki Aoyama

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DS90CR287: Output pulse position