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ADG714 switches operate in pairs

Question asked by cbutcher on Jan 29, 2018
Latest reply on Feb 7, 2018 by cbutcher

I have connected the ADG714 to a printed circuit board and have somewhat successfully managed to program the controlling software such that I can switch the connections on and off.

 

However, my pins are operating in adjacent pairs - that is, the 5th bit I send switches #3 and #4, whilst the 6th bit controls switches 5 and 6 and the 7th bit controls switches 7 and 8. I'm not using switches 1 and 2 (they're not connected) so I can't test their behaviour.

 

Is this most likely a programming problem, or did I damage the chip during fabrication? Oscilloscope traces for the digital signals look good - I see falling SYNC, followed by 8 SCLK pulses with changes on the rising edge (to allow reading by the ADG714 on the falling edges, when the voltage is constant) followed by the SYNC pin re/deasserting (going back to 5V high).

 

Is there some way I can diagnose this issue?

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