DS90UB953A-Q1: the CLK_OUT setting of Synchronous mode

Jackie Liao

Part Number: DS90UB953A-Q1

Hi All,

Could you help to confirm the calculation of the CLK_OUT is correct because the result of example 2 is different from the datasheet?

Refer to the example 2 (EF F => 25MHz, M => 1 (0X01), N => 30 (0X1E), HS_CLK_DIV => 4),
our result is 33.33MHz which is different from 37.037 of Datasheet.

Attached our block diagram for your reference.
If possible, would you help to provide the upper and lower limits that could be set for the values of M and N.

over 4 years ago

0 Casey McCrea over 4 years ago

TI__Guru** 103215 points

Hello Jackie,

Based on the settings you provided above, the 33.3MHz CLK_OUT is correct so I'm not sure what you mean:

FC = 25MHz*160 = 4Gbps

M = 1

N = 30

HS_CLK_DIV = 4

CLK_OUT = FC*(M/(N*HS_CLK_DIV)) = 33.3MHz

Best Regards,

Casey

0 Jackie Liao over 4 years ago in reply to Casey McCrea

Prodigy 70 points

Hi Casey,

Thanks for your kindly reply.

Our R&D has a little confused that the result from the datasheet is 37.037MHz (please refer to the below picture).

BTW, could you provide the upper and lower limits that could be set for the values of M and N for us reference?

Regards,

Jackie Liao

0 Casey McCrea over 4 years ago in reply to Jackie Liao

TI__Guru** 103215 points

Hello Jackie,

Thank you for pointing this out. The datasheet appears to have a typo. The N value should be 0x1B in that example, not 0x1E. We will flag it for the next datasheet update.

For the min and max values we would have to check to see if we have any characterization data

Best Regards,

Casey

0 Jackie Liao over 4 years ago in reply to Casey McCrea

Prodigy 70 points

Hi Casey,

Thank you and waiting for your news!

Regards,

Jackie Liao

0 Casey McCrea over 4 years ago in reply to Jackie Liao

TI__Guru** 103215 points

Hey Jackie,

For the CLK_OUT limit, the resultant frequency must be less than 100MHz.

M value must be in range 1-31 and N value must be in range 1-255.

Best Regards,

Casey

0 Jackie Liao over 4 years ago in reply to Casey McCrea

Prodigy 70 points

Hi Casey,

Thank you for your kindly reply!~

Regards,

Jackie Liao

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DS90UB953A-Q1: the CLK_OUT setting of Synchronous mode