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  1. WebSep 18, 2017 · Features. Ultra-Low Drift: 5ppm/°C Max. Trimmed to High Accuracy: 0.05% Max. Industrial Temperature Range SO Package. Operates in Series or Shunt Mode. Pin Compatible with AD586, AD587. …

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    The LT1236 combines both superior accuracy and tem-perature coefficient specifications without the use of high power, on-chip heaters. The LT1236 references are based on a buried zener diode structure which eliminates noise and stability problems with surface breakdown devices.
    The LT1236-5 does have an output voltage trim pin, but the TC of the nominal 4V open circuit voltage at pin 5 is about –1.7mV/ C. For the voltage trimming not to affect reference output TC, the external trim voltage must track the voltage on the trim pin.
    R2 can be added to further reduce current in the output sense lead. The LT1236 has very low noise because of the buried zener used in its design. In the 0.1Hz to 10Hz band, peak-to-peak noise is about 0.5ppm of the DC output. To achieve this low noise, however, care must be taken to shield the reference from ambient air turbulence.
    The LT1236-10 “A” version is pre-trimmed to –5mV and therefore can utilize a restricted trim range. A 75k resistor in series with a 20kW potentiometer will give –10mV trim range. Effect on the output TC will be only 1ppm/ C for the –5mV trim needed to set the “A” device to 10.000V.
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