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ISL26134AVZ-T Scheda tecnica(PDF) 7 Page - Intersil Corporation |
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ISL26134AVZ-T Scheda tecnica(HTML) 7 Page - Intersil Corporation |
7 / 23 page ISL26132, ISL26134 7 FN6954.1 September 9, 2011 Noise Performance The ISL26132 and ISL26134 provide excellent noise performance. The noise performance on each of the gain settings of the PGA at the selected word rates is shown in Tables 5 and 6. Resolution in bits decreases by 1-bit if the ADC is operated as a single-ended input device. Noise measurements are input-referred, taken with bipolar inputs under the specified operating conditions, with fCLK = 4.9152MHz. TABLE 5. AVDD = 5V, VREF = 5V, DATA RATE = 10Sps GAIN RMS NOISE (nV) PEAK-TO-PEAK NOISE (nV) (Note 10) NOISE-FREE BITS (Note 11) 1 243 1604 21.6 2 148 977 21.3 64 10.8 71 20.1 128 10.2 67 19.1 TABLE 6. AVDD = 5V, VREF = 5V, DATA RATE = 80Sps GAIN RMS NOISE (nV) PEAK-TO-PEAK NOISE (nV) (Note 10) NOISE-FREE BITS (Note 11) 1 565 3730 20.4 2 285 1880 20.3 64 28.3 187 18.7 128 27 178 17.7 NOTES: 10. The peak-to-peak noise number is 6.6 times the rms value. This encompasses 99.99% of the noise excursions that may occur. This value best represents the worst case noise that could occur in the output conversion words from the converter. 11. Noise-Free Bits is defined as: Noise-Free Bits = ln(FSR/peak-to-peak noise)/ln(2) where FSR is the full scale range of the converter, VREF/Gain. |
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