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Problem with getting AD5292BRUZ-20 to work?

Question asked by dal on Jun 3, 2011
Latest reply on Jul 8, 2011 by musach

I have a problem using AD5292BRUZ-20.

The SPI is working fine as the device outputs on the SDO the exact data which was shifted in the previous frame. Commands 2, 4, 5 and 8 are working, but the chip doesn't accept the 'write control register' cmd=6, so that the RDAC write acees can't be enabled. If I read the ctrl reg value by CMD=7, it's not changed and stuck at '0'. I also noticed that the RDY signal is doing strange things, which are not described in the datasheet of the product. It is pulled down by the device during shift register exchange, while according to the data sheet it should go down only when the sync goes high. Attached is a scope plot which shows the strange behavior of the RDY pin.http://tinyurl.com/AD5292

 

Are there any lots on the field which are known to be f**ked up? I read on the web that I'm not the only one who has such kind of issues with the AD5292, there are a lot of frustrated people.

 

Could you please help me out with this issue? I'm sick and tired already...

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