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FS970X データシート(PDF) 26 Page - Fortune Semiconductor Corp. |
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FS970X データシート(HTML) 26 Page - Fortune Semiconductor Corp. |
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26 / 46 page  FS970X Rev. 4.4 26/46 With suitable gain option control, all kinds of measurement can be applied to the best dynamic range of ADC. Chart 15 shows the setup of three typical functions and ADG<5:0> in the application of DMM. 1st function 2nd function 3rd function ADG<5:0> 01_0011 11_0111 11_1000 Reference voltage gain（GREFi） 1.0 1.25 1.25 Input voltage gain（GSIGi） 1.0 1.25 0.1 Chart 15 970x Typical ADC function setup. The measurement transfer functions of each function is: Formula 7 ref x REFi SIGi x v v G G D The reference voltage of each function and the gain approximation of the input voltage are shown in Chart 15. The actual precise gain value and offset voltage should be obtained from calibration. Digital Filter As shown in Graph 9, the 1-bit output from the comparator must go through a digital low-pass filter and perform calculation similar to arithmetic average to become a high-resolution multi-bit resolution. The transfer function of digital filter used by 970x is: Formula 8 H f N N f f f f S S 1 2 2 sin sin Whereas, N is the number of the filter (TAP). Assuming the sampling frequency of the ADC is 166kHz and the number of the filter is 16600, the frequency response Graph of the filter is shown as Graph 9. The first zero-point would be found at: Formula 9 f f N Z S 1 166000 Hz 16600 10 Hz Thereafter, all the integer multiple points of the first zero-point occur zero-point. The signal around the zero-point will be completely filtered out by the filter. So the frequency responses as shown in Graph 12, all have good suppressing effect to the noise of 50 Hz and 60 Hz. By the same token, assuming the sampling frequency is 83kHz, and the number of the filter is still 16600, then, the first zero-point position can be calculated as 5 Hz. |
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