High Speed A/D converter 12-bit


Posted on Nov 3, 2012

This system performs a complete conversion of 12 bits in 10 p unipolar or bipolar. This converter is accurate to ± 12-bit LSB Y2 and a typical gain TC of 10 ppm / ° C. In unipolar mode, the system range is 0 V to 9.9976 V, with each bit having a value of 2.44 mY. For the accuracy of true conversion, an A / D converter must be trimmed so that, given the results just the exit code of input levels of Y2 Y2 LSB LSB below to above the exact voltage represents the code.



High Speed A/D converter 12-bit - image 1
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Therefore, the converter zero point should be cut with an input voltage of 1.22 mY; R trim until the LSB is just beginning to appear in the exit (all other bits "0") . For the entire scale, use an input voltage of 9.9963 V (10-VI LSB LSB Y2), then cut R2 until the LSB is just beginning to appear (all other bits "1 "). Bipolar signal range - 5.0 V to 4.9976 V. Bipolar offset cutting is done by applying a - 4.9988 V input signal and trimming R3 for LSB transition (all other bits "0"). On a large scale is determined by applying cutting R2 4.9963 V and the transition to LSB (all other bits "1").




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