Digi-Key TechXchange Communities: Message List

AD7706 analogue front end trouble

noreply@digikey.com — Mon, 30 Apr 2012 19:03:21 GMT

Ok..... It's me again.....

I figured it out! The reset pin needs to be pinned to Vdd. My instinct was to leave any thing that said reset alone, but this one needs to be forced high for normal operation.

I knew it must be some dumb little thing.

-Arie

Which development board do you suggest me for a beginner

noreply@digikey.com — Sun, 29 Apr 2012 04:38:03 GMT

I love the propeller... Started with the basic stamp from parallax which is great for being easy but it's limitations come up fast... The propeller has been a blast!

-Arie

AD7706 analogue front end trouble

noreply@digikey.com — Sat, 28 Apr 2012 07:42:38 GMT

Hi all,

I'm driving myself crazy trying to get the ad7706 set up. The data sheet says it need to have its registers filled up before data can be read.... I've followed all the instructions ad nausium and double checked every thing with an oscilliscope. The dataready pin is always high ie not ready and if I try to read anyway no data comes out. I can't get any sign of life out of the chip. It looked real good for my purpose (amp meter with 0.002ohm sense resistor) so I bought several. Figured that maybe I'd fried it so I donned my anti static gear and tried another one. Same thing!

Someone please help me get any sign of life out of this chip!

Thanks

Arie

Ps I'm using a propeller chip @ 100mhz and a 5mhz crystal for the adc set for internal division by two (2.5mhz)