AD9117 DAC Reset Issue

Question

Dear team, 
 We are facing DAC reset issue on AD9117(DAC) 
 During power on time DAC registers randomly jump to 0,FF & 0,A instead of default values. 
 For odd registers the value read is " 0 " and for even registers the value read is " FF " during first reading. 
 During Second time reading " 0" is read for odd registers and " A" is read for even registers. 
 Read the registers, after writing the corresponding values in corresponding registers still the junk values only read (the write values didn't write properly). 
 The reset pulse given for DAC reset pin is 500us for every power ON. 
 The DAC register write operation is starts after 13ms from DAC reset. 
 Note: The above mentioned issues are happened only random power On not frequently. 
 with regards, Arumuga Raj S System Engineer Datapatterns(India)Ltd.

JMMina · Accepted Answer

Hi Arumugam2608 , 
 500us reset pulse should be enough duration to reset the registers to their default values, but can you check if you providing the right reset pulse to the RESET/PINMD (pin 35)? The pulse will depend which mode you are in: SPI mode or PIN mode. Please refer to page 52 of the AD9117 datasheet . 
 
 Also, are you using the AD9117 evaluation board? If not, can we get a copy of your board schematic? Just so we could check if your power supply (AVDD, CVDD, DVDDIO, DVDD) are within operating conditions, as well as the DAC connections.)

JMMina · Answer

This question is answered offline.

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AD9117 DAC Reset Issue