Other Parts Discussed in Thread: REF5025, REF6025, REF6225
I am designing with ADS8598H (seismic application, Delta-Sigma are not suitable due to some technical reasons) with folllowing options (long term stability, low noise, low drift are the main points for design). The application has temperature range of -10 degree to 60 degree. Need help for selection of voltage reference type and part.
1. Internal or external Voltage Reference
2. If external, REF6025 adn REF5025.
Before closing the hardware design, I want to finalise above to have minimal parts on board.
Q.1 - Selected external reference due to temperature drift poor than external one.Need comment, does it is wise go external instead of internal based on above temperature range?
Q. 2 - External Ref REF5025 or REF6225 ? 5025 does not have output buffer, but has very good source and sink of current 10mA compared to 6225 (which is 4 mA). One parameter is not able to trace in 5025 DS, output impedance? Being such value of source/sink, do we need to know Output Z and buffer at output?
I like to go with REF5025, becuase its input power supply range which is 18V, whereas REF6225 is 5.5V max.
Thanks in advance.
Dr. Mahabir Prasad