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AD9953 RAM MODE issue

Question asked by Nitesh.k on Jul 21, 2017
Latest reply on Jul 23, 2017 by LouijieC

Hi

We are using AD9953 IC in our design to generate a freq sweep. we are using external 400MHz osc for system clock.

Single tone mode is working fine.but facing following issue in RAM mode.

 

1. In RAM mode IC provide output only when we configure freq in the multiple of 25MHz in RAM.

 

For Example

if we configure 2 RAM location with 25 & 50 MHz freq then it will provide output.

But if we configure same 2 RAM location with 25 & 49 MHz freq then it will provide no output. infact if we configure any freq other than multiple of 25 MHz IC not providing any output.

 

Register setting in case of 25 & 49 MHz

 

CFR1 (0x00) : 80 00 00 00

RSCW0 (0x07) : 58 02 01 00 60

RAM (0x0B) :

<0> : 10 00 00 00

 <1> : 1F 5C 28 F5

 

 

Thanks

Nitesh.k

 

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