Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question

Are there any recommendations for applying VDD on AD7829 ?

Are there any recommendations for applying VDD on AD7829 ?


We recommend the following when using our AD7829 ADC:

1)When powering down the AD7829,  we recommend that you do bring VDD all the
way to 0V when powering down, before re-applying power (VDD) again.

2)CONVST can go high with VDD, the important thing to remember here is not to
exceed VDD, we have tried both with CONVST connected to a pull-down
resistor...(10K to gnd ) and with a pull-up resistor to VDD, both
configurations are acceptable. Please ensure that you do not have a glitch on
CONVST especially during power-up as this will try to power-up the part without
VDD fully settled and cause the part to lock-up. The only way out of this
situation is to power-down and power-back up again correctly.

Unfortunately the above points, especially the first are not sufficiently
highlighted in the datasheet.