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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.