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AD7746ARUZ-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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AD7746ARUZ-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 28 page AD7745/AD7746 Rev. 0| Page 11 of 28 OUTPUT NOISE AND RESOLUTION SPECIFICATIONS The AD7745/AD7746 resolution is limited by noise. The noise performance varies with the selected conversion time. Table 5 shows typical noise performance and resolution for the capacitive channel. These numbers were generated from 1000 data samples acquired in continuous conversion mode, at an excitation of 32 kHz, ±VDD/2, and with all CIN and EXC pins connected only to the evaluation board (no external capacitors.) Table 6 and Table 7 show typical noise performance and resolution for the voltage channel. These numbers were generated from 1000 data samples acquired in continuous conversion mode with VIN pins shorted to ground. RMS noise represents the standard deviation and p-p noise represents the difference between minimum and maximum results in the data. Effective resolution is calculated from rms noise, and p-p resolution is calculated from p-p noise. Table 5. Typical Capacitive Input Noise and Resolution vs. Conversion Time Conversion Time (ms) Output Data Rate (Hz) –3dB Frequency (Hz) RMS Noise (aF/√Hz) RMS Noise (aF) P-P Noise (aF) Effective Resolution (Bits) P-P Resolution (Bits) 11.0 90.9 87.2 4.3 40.0 212.4 17.6 15.2 11.9 83.8 79.0 3.1 27.3 137.7 18.2 15.9 20.0 50.0 43.6 1.8 12.2 82.5 19.4 16.6 38.0 26.3 21.8 1.6 7.3 50.3 20.1 17.3 62.0 16.1 13.8 1.5 5.4 33.7 20.5 17.9 77.0 13.0 10.5 1.5 4.9 28.3 20.7 18.1 92.0 10.9 8.9 1.5 4.4 27.8 20.8 18.2 109.6 9.1 8.0 1.5 4.2 27.3 20.9 18.2 Table 6. Typical Voltage Input Noise and Resolution vs. Conversion Time, Internal Voltage Reference Conversion Time (ms) Output Data Rate (Hz) –3dB Frequency (Hz) RMS Noise (µV) P-P Noise (µV) Effective Resolution (Bits) P-P Resolution (Bits) 20.1 49.8 26.4 11.4 62 17.6 15.2 32.1 31.2 15.9 7.1 42 18.3 15.7 62.1 16.1 8.0 4.0 28 19.1 16.3 122.1 8.2 4.0 3.0 20 19.5 16.8 Table 7. Typical Voltage Input Noise and Resolution vs. Conversion Time, External 2.5 V Voltage Reference Conversion Time (ms) Output Data Rate (Hz) –3dB Frequency (Hz) RMS Noise (µV) P-P Noise (µV) Effective Resolution (Bits) P-P Resolution (Bits) 20.1 49.8 26.4 14.9 95 18.3 15.6 32.1 31.2 15.9 6.3 42 19.6 16.8 62.1 16.1 8.0 3.3 22 20.5 17.7 122.1 8.2 4.0 2.1 15 21.1 18.3 |
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