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AD7747 Datasheet(PDF) 9 Page - Analog Devices |
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AD7747 Datasheet(HTML) 9 Page - Analog Devices |
9 / 20 page Preliminary Technical Data AD7747 Rev. PrC| Page 9 of 20 OUTPUT NOISE AND RESOLUTION SPECIFICATIONS The AD7747 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 16 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) 22.0 45.5 23.9 41.9 TBD TBD TBD TBD TBD TBD 40.0 25.0 76.0 13.2 124.0 8.1 6.9 15 40 250 18.5 16.0 154.0 6.5 184.0 5.4 219.3 4.6 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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