Building a 10 volt reference using some vintage AD584 IC’s from 1983.
While organizing some spare part bins from years past, I came across an assortment of IC’s in what used to be popular, eight-terminal TO-99 metal cans. Many of these were op-amps, negative voltage regulators, comparators, and a dozen AD584 voltage reference IC’s.
The Analog Devices AD584 is a Pin Programmable Precision Voltage Reference, capable of outputting voltages of 10.000 V, 7.500 V, 5.000 V, and 2.500 V. The AD584 is still manufactured in a revision C version.
After setting up one on a breadboard, I decided to make a small printed circuit board so that I could have a standalone 10 volt reference to compliment the Quad — Voltage Reference and the Programmable Voltage Reference.
Only a few components are needed for a functional reference. I based my design on the datasheet example of “Output Trimming” and used a low temperature coefficient (±5ppm/°C) Vishay Dale PTF56312K00FZEB 312K ohm resistor along with a Vishay Y005610K0000K0L 10K ohm foil trimmer (±15ppm/°C). Other parts include a 1uF ceramic capacitor, two 0.1 uF ceramic capacitors, and a Teflon TO-99 socket with gold plated contacts.
Supply voltage for the reference is 15 volts DC supplied by a Texas Instruments TL780-15KCS positive regulator in a TO220 package mounted on the back case panel, using an external 18.5 volt AC-DC power supply.
Initial testing at room temperatures with only a few days of operational time on the IC showed the reference to be stable within 30 uV, with a very slow voltage increase of a few microvolts every 6 hours.
My plan is to keep the reference powered up for the next 20 days and track the drift and temperature to see when it starts to stabilize, and then adjust the trim for 10.00000 volts.
Enclosure is a black aluminum Hammond model 1457C801BK, with a dimension of 3.15 in L x 2.4 in W x 1.21 in H.
The front banana jacks are Pomona Electronics 2854 series, with gold plated brass body. Colors are 2854–0 Black and 2854–2 Red.
Eagle CAD V7.7.0 design files: Ref10VcanV10.zip Version 1.0
Eagle CAD V7.7.0 design files: Ref10VcanV102.zip Version 1.02
Boards available from OSH Park: Version 1.0