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AD75019 I get strange results when trying to control the AD75019 from an Arduino

Question asked by gratefulfrog on Feb 11, 2018
Latest reply on May 30, 2018 by gratefulfrog

Hello,

 

I am trying to use an AD75019 to route analog signals on -10 to +10v.

 

I have provided +/- 12v to the analog supplies, 5v to the digital supply and am running SPI from the arduino at 1MHz. I've observed the clk,pclk,sin lines on the oscilloscope and they appear correct according to the data sheet.

 

I send various bit arrays, but the resistance between any pair of pins seems to stay around 30 ohm. Even if I send all zeros, the resistance does not change.

 

I can alter the behavior by changing the analog supplies, but cannot seem to get the "normal" behavior.

 

Any ideas would be very welcome.

Thanks,

Bob

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