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DS90UB935-Q1: CLK_OUT error

Part Number: DS90UB935-Q1

Hi  team,

my customer use this mode, CLK_IN configured as 32MHz input, 

use below marked GREEN to create CLK_OUT=24MHZ

then they test 32MHz active crystal : AVG: 31.997MHz, MAX: 32.051MHz, MIN: 31.948MHz. 

The test CLK_OUT is 23.75MHZ~24.25MHZ.Is this error within reasonable limits? If not, please help to analyze the cause of this large error 

thanks

  • Hello Hazel,

    In section 7.4.1.5 Configuring CLK_OUT in the DS90UB935-Q1 datasheet, it states that there will be very low jitter if the ratio N/M is an integer.

    In this case, you are using N=80 and M=3, which results in (N/M) not being an integer. If you adjust the (N/M) values to be an integer, then there should be less variation.

    Best,

    Justin Phan