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Micropower +/- 5V. reference
This circuit uses an LT1078 op amp to form a micropower, +/-5 volt reference with a 10ppm/°C temperature coefficient. The +9v supply draws 115 microamps and the -9v draws 85 microamps. Output noise is 36 microvolts peak-to-peak from 0.1Hz to 10Hz. The LT1078 contributes less than 3% of the total output noise and drift with time and temperature. The accuracy of the -5v output depends on the matching of the two 1 megohm resistors.