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		(title "LM399 negative voltage reference")
		(date "2024-07-30")
		(rev "3.4.2")
		(comment 1 "Copyright (©) 2024, Patrick Baus <patrick.baus@physik.tu-darmstadt.de>")
		(comment 2 "Licensed under CERN OHL-W v2.0")
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	(text "17k: Pin 1 <-> Pin 2\n20k: Pin 2 <-> Pin 3\nPin 1 is marked on\nthe package"
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	(text "e.g. ERA-6ARB752V (10 ppm)\nPCF0805-13-7K5-B-T1 (5 ppm),\nTE Connectivity RU73X2A7K5LTDF (2 ppm),\nVishay S102 (2 ppm)"
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	(text "Trace resistance of 0.32 Ohm\n(100mm, 4000 ppm / K) causes\na 1.5 µV / K error."
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	(text "Kelvin connect the Zener. Even the the small current\npassing through R2 (1 mA) will introduce an error of 0.2 ppm/K\ngiven a normal PCB copper trace.\n(10 mm trace 0=> 0.2 ohm, 1 mA, 0.7 % tcr, ~7 V reference)"
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	(text "Mount the LM399 a *little* off the board,\nto keep stress away.\nSource: http://www.eevblog.com/forum/\nmetrology/ultra-precision-reference-ltz1000/\nmsg404500/#msg404500"
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	(text "Kelvin connect this to the V_zener+ input pin"
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	(text "Note: Use a TE 8060-1G12\nor 8060-1G22 socket to\nmount diodes for burn-in.\nThe 1G22 is smaller in\nheight, but harder to get."
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	(text "This resistor will supply the zener current.\nIt does not need to be exactely 7.5k, but a\nzener current of 1 mA or slightly above is\nrecommended (ADR1399 needs 3mA).\nThis resistor needs to be matched if the\namplification is changed. Currently\nI_Zener = (15 V - 6.95 V) / 7.5k"
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	(text "The output drift with the zener current\nis about 0.15 ppm / ppm maximum.\nIn order to meet the LM399 specs make sure the resistor\nhas a maximum TCR of 10 ppm / K (results in 1.5 ppm / K)."
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	(text "Use 1 oz./sqft of copper to\nminimize trace resistance and\ntherefore minimize succeptibility\nto temperature."
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	(text "If the a moving cap is a problem,\nwe could increase the pin spacing\non the PCB and bend the legs a\nlitte, so that they hold the cap in\nplace. This was done by HP in the\n3456A."
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	(text "The LM399 has a\nTCR of 0.3 ppm/K"
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	(text "Compensation\nnetwork for\nthe ADR1399."
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	(text "Use a Film capacitor with a high insulation\nresistance (no polyester), which is stable\nover temperature. Nowadays C0G (BME) is\neven better than film.\nInformation on insulation resistance can be found here:\nhttp://www.iequalscdvdt.com/Insulation_resis_.html\nhttps://www.vishay.com/docs/26033/gentechinfofilm.pdf"
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	(text "The diode ensures correct startup\nand also makes sure the DAC, that\nfollows never sees a positive\nvoltage"
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	(text "Output voltage Table:\nVoltage   | R1    | RN1a  | RN1b\n-----------------------\n-10 V    | 3k    |   20k  | 9k\n-15 V    | 7.5k  |   17k  | 20k"
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