Problem with AD8332 output.

Hi Dibyendu007,

Thank you for using the AD8232 for your project.
I think we'll need more details regarding your circuit in order to help you out effectively. Can we get the voltage levels/configuration on the AD8232 inputs (VCC, RA, LA, etc.)? And how are you measuring using the output using your Arduino?

Though, one thing to quickly try out is to tie the SDN pin to your VCC as this is mentioned on the page 21 of the datasheet.
Thanks Dibyendu007.

Best Regards, Dann

Hi DBautista,

Many thanks for your time. I had connected Vcc to 3.3V and RA, LA and RL with ECG test leads to my body using those sticky ECG pads. One thing I should mention though. This part of the circuit is being made on flexible, transparent substrate, (PU) which do not have any ground plane in the bottom side. Also the2.5mm female jack for RA, LA and RL is not place very close but connection is made from the PCB substrate to the female jack using unshielded wires (around 10cm) and then the ECG leads are connected tot he female jack. Could this the source of noise? Also I tried to read the voltage level at the LOD+ and LOD- pins using a multimeter, I only read 0V even when the leads are disconnected.

I was measuring the output through a Arduino. Even the voltage was being supplied from 3.3v output pin of arduino. and ground is common. 

Hello, did you solve this problem and how to solve it.

I had some dry solder problem at the SDN pin. Because of which the SDN was remaining floating. 

Hello, when I use AD8232, the LOD outputs a 50hz square wave. I don’t know if it’s also because of SDN pin.

Hi Brucelin,

Can you elaborate more about the exact nature of your problem. What are the pin configurations and what voltage level you used..??

Regards,

Dibyendu007 

Hi Dibyendu007 ,

I have the same problem as https://ez.analog.com/amplifiers/instrumentation-amplifiers/f/q-a/542674/ad8232-output-questions

Regards,

Brucelin

Hi Brucelin,Did you tie vcc to SDN (bar) pin??.

If not do so, I had similar issue. because of dry solder my SDN(bar) pin was floating so I read only noise. I seems to be the same for you.

Hi Dibyendu007,thank you for your reply.

I have tied VCC to SDN pin,and I will go to see if SDN is soldered.

Regards,

Brucelin

Hi Dibyendu007,thank you for your reply.

I have tied VCC to SDN pin,and I will go to see if SDN is soldered.

Regards,

Brucelin