Hello,
Recently i had purchased an AD9850 dev board from the net. The device is supposed to be capable of serial or parallel load operation. That means we should be able to load a 40 bit word that sets the frequency (and a few other things) either in a serial fashion or parallel.
Despite all attempts to get the serial mode to work, everything fails. The frequency output appears to have nothing to do with the 40 bit word, and flipping a bit in some codes does nothing to alter the frequency.
In parallel mode, it worked with the first try.
There is nothing particularly complex about the word format or comm protocol for either serial or parallel. Serial (I2C like) programming usually works pretty simple, and it's worked with displays for example quite easily.
Any ideas what might be happening? I can only suspect a partially defective chip at the moment.
Recently i had purchased an AD9850 dev board from the net. The device is supposed to be capable of serial or parallel load operation. That means we should be able to load a 40 bit word that sets the frequency (and a few other things) either in a serial fashion or parallel.
Despite all attempts to get the serial mode to work, everything fails. The frequency output appears to have nothing to do with the 40 bit word, and flipping a bit in some codes does nothing to alter the frequency.
In parallel mode, it worked with the first try.
There is nothing particularly complex about the word format or comm protocol for either serial or parallel. Serial (I2C like) programming usually works pretty simple, and it's worked with displays for example quite easily.
Any ideas what might be happening? I can only suspect a partially defective chip at the moment.