Timeline for What is the purpose of the 400 kΩ resistor in the 7 V positive reference circuit of the LTZ1000?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Feb 7 at 16:00 | comment | added | MOSFET | @jsuarezbaron IDK and I don't have time to look into it. But without even thinking about it, why wouldn't you include it without out any thought? I guess if your in the quantities of > 10 million's, shaving off an SMD resistor might be worth the increased temp drift... | |
| Feb 6 at 17:46 | comment | added | jsuarezbaron | Apart from achieving the "0.05 ppm/°C drift", does the absence of the 400kΩ resistor affect the 7.02V voltage to be generated by the LTZ1000 reference? | |
| Feb 6 at 17:37 | comment | added | MOSFET | From page 5, first line under the schematic: "*PROVIDES TEMPERATURE COMPENSATION, DELETE FOR LTZ1000A". The "0.05 ppm/°C drift" comes from the device specification. The resistor is how you achieve that. | |
| Feb 6 at 17:34 | comment | added | jsuarezbaron | I checked page 5 of the datasheet and could not find where it explains that the 400k ohm resistor provides the temperature stability to achieve the 0.05 ppm/°C drift. | |
| Jan 25 at 1:38 | history | answered | MOSFET | CC BY-SA 4.0 |