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| Precision voltage references...? |
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| Conrad Hoffman:
Apparently it's still quite subject to PCB stress; I wonder if you could mount it on a few fine wires and eliminate that? At least that was the claim over in the metrology forum. It's way cheaper than the LTZ1000! |
| iMo:
Sure, make a slot 7x7mm into the pcb (package is 5x5mm), put the package in and wire it with 3 (or 4) thin wires.. Still it is 5ppm/K max, not comparable with LTZ nor LM399.. --- Code: ---Hermetic 5mm × 5mm LCC Leadless Chip Carrier Package: Insensitive to Humidity Thermal Hysteresis: 8ppm (0°C to 70°C) Thermal Hysteresis: 12ppm (–40°C to 85°C) Low Drift: 5ppm/°C Max High Accuracy: ±0.10% Max Low Noise: <1ppm Peak-to-Peak (0.1Hz to 10Hz) Low Long Term Drift 12ppm at 1000Hr 18ppm at 3000Hr --- End code --- |
| jbb:
--- Quote from: Conrad Hoffman on February 03, 2020, 09:58:22 pm ---Apparently it's still quite subject to PCB stress; I wonder if you could mount it on a few fine wires and eliminate that? At least that was the claim over in the metrology forum. It's way cheaper than the LTZ1000! --- End quote --- Maybe a flex PCB with some cunning slits. You could even add an NTC or RTD next to it, and make a little flex lead pod to sit inside a tiny DIY oven... |
| Andreas:
--- Quote from: imo on February 03, 2020, 08:47:31 pm ---In LT1027LS8 DS (2016) they spent entire page 10 with the elaboration of humidity influence via PCB stress :) --- End quote --- 3 slots, 4 slots The sad truth is that 1 slot is better than 4. --- Quote from: imo on February 03, 2020, 10:02:46 pm ---Sure, make a slot 7x7mm into the pcb (package is 5x5mm), put the package in and wire it with 3 (or 4) thin wires.. Still it is 5ppm/K max, not comparable with LTZ nor LM399.. --- End quote --- The T.C. isnt that bad (at least near room temperature). But the hysteresis in the LS8-package is larger than in the DIP8 package. So they messed up something with the die attach. I am wondering if the (obsolete) metal can package shows that large hysteresis. With best regards Andreas |
| iMo:
The LT1027 metal can H package - LT databook '92: Hysteresis delta 25C typ 10ppm Long term stability typ 20ppm/month |
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