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VREF pin is referenced to analog ground. The power supplies should be well bypassed using capaci- tors with low impedance at high frequency. A value ofO.lccF is adequate for most circuit layouts. The VFC100 is specified for a nominal supply voltage of +15V. Supply voltages ranging from +7.5V to +18V may be used. Either supply can be up t0 28V as long as the total of both does not exceed 36V. Steps must be taken, however, to assure that the integrator output does not exceed its linear range. Although the integrator output is capable of 12V output swing with 15V power supplies, with 7.5V supplies, output swing will be limited to approximately 4.5V. In this case, the comparator input cannot be offset by directly connecting to the SV reference output pin. The comparator input must be connected to a lower voltage point (approxi- mately 2V). This allows the integrator output to operate around a lower voltage point, assuring linear operation. This threshold voltage does not affect the accuracy or drift ofthe VFC as long as it is not noisy. It should not be made too