Hi,
I have a couple of questons about the direct ADC mode of LTC2986. Please take care of this case.
- What is the maximum sampling speed of internal 24 bit ADCs in the direct ADC mode?
- How can I know conversion start and finish in the direct ADC mode? I can know those by reading any register value?
Regards,
Kazu
Hi Kazu,
The maximum sampling speed of the LTC2986 is fixed for power line rejection. It is about 6Hz when in the default 50/60Hz mode. It will be slightly faster when set for 50Hz rejection only, and…
The maximum sampling speed of the LTC2986 is fixed for power line rejection. It is about 6Hz when in the default 50/60Hz mode. It will be slightly faster when set for 50Hz rejection only, and slightly slower for 60Hz only. Please see the tables in page 4 of the datasheet as well as page 75 for 2 and 3- cycles modes. Direct ADC is always a 2-cycle mode.
Conversion start/finish can be monitored by watching the INT signal (pin), as well as watching the Command status register (address 0x000) which will change from 0x80 during a conversion (start bit = 1, done bit = 0) to 0x40 when finished (start bit = 0, done bit = 1). Please see page 17-21 of the LTC2986 DS for more info.
-Logan