I have two questions about AD7680 and AD7940 power dissipation. Please take care of this case.
What is the power dissipation in the standby condition?
(Standby: No input, VDD=3V, /CS=”H”, SCLK=don’t care)
What is power dissipation in the following condition?
(Normal mode, /CS="L", SCLK=250kHz to 1MHz, Throughput=250sps, VDD=3V)
By making the frequency of the SCLK lower, the power dissipation becomes also lower.
I need to operate the chips as low power dissipation as possible but I would not like to use the power-down mode.
If you don’t have data covering Q1 and Q2 conditions, similar ones would be helpful.
The conditions that you mentioned are not specify on the datasheet, so it is a little hard the result. But I am sure that as the throughput rate increases the power dissipation also increases as what was shown in figure 19 of the AD7940 datasheet.
If you are looking for a very low power ADC even in operational mode, you may want to check the AD7091R. This is a very low power ADC that is capable at faster throughput rate. Attached is the link of the datasheet.