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5V Powered, Quartz-Stabilized 10kHz Voltage to Frequency Con

2014-11-01 03:54  
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View Full Size Image View Original Application Note5V Powered, Quartz-Stabilized 10kHz Voltage to Frequency Converter has 0.0015% Linearity and 8ppm/°C Temperature Coefficient

Almost all precision voltage-to-frequency converters utilize charge pump based feedback for stability. These schemes rely on a capacitor for stability. A great deal of effort towards this approach has resulted in high performance V to F converters. Obtaining temperature coefficients below 100ppm/°C requires careful attention to compensating the capacitor’s drift with temperature. Although this can be done, it complicates the design. Similarly, capacitor dielectric absorption causes errors, limiting linearity to typically 0.01%. This 5V powered design, reduces gain TC to 8ppm/°C and achieves 15ppm linearity by replacing the capacitor with a quartz-stabilized clock.




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