Electronics > Metrology

Ultra Precision Reference LTZ1000

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branadic:
The model is missing the resistors shown by John Pickering at Metrology Meeting 2021 too.

-branadic-

imo:
With highest numeric resolution the TC of the LTZ1000A Vref shows -3nV/C (20-55C amb).
A small (ie 8ohm) resistor in anode does not change TC much, the output voltage increases by a few mV.
There is also an ADI's "testing jig" in the model - showing the response of the Vref on the heater power (switching it on/off). See below.
I think this is not the last revision of the model..

chris_11:
To the LT1000 LTSpice model. You can set the start temperature with a .temp statement and get an idea of the conditions in that case.

To the LTC1052 "Latched" reference. Educated guess: The LTC1052 gets phase reversal with both inputs at GND and you get a stable situation with the circuit not starting up. If you prebias one input enough in the right direction it should start.

A CMOS IC latch up is usually a destructive event with the CMOS IC turning into a switched on Thyristor over its supply rails with no real current limit.

@branadic.  You can add the resistors external and see what changes.

aronake:
How do people get hold of the fancy sealed metal film resistors?

They are pretty much out of stock in all places I have seen.

Put an order and wait?

martinr33:
Try Texas Components. They are a Vishay licensee and are pretty quick. They don't carry the full range.

You will probably have to call them.

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