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AD637JD датащи(PDF) 10 Page - Analog Devices |
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AD637JD датащи(HTML) 10 Page - Analog Devices |
10 / 20 page AD637 Rev. K | Page 10 of 20 FOR A SINGLE-POLE FILTER SHORT RX AND REMOVE C3 1 25kΩ DEN INPUT BUFF IN BUFF OUT –VS CS dB OUTPUT 3COMMON BIAS 2NC 4 OUTPUT OFFSET +VS 5 25kΩ 6 7 8 9 10 +VS 11 12 NC 13 14 RMS OUT VIN CAV + AD637 ABSOLUTE VALUE –VS +VS CAV VIN + C2 4.7kΩ C3 24kΩ + RX 24kΩ SQUARER/ DIVIDER INPUT FREQUENCY (Hz) 100 0.01 1 100k 10 100 1k 10k 10 1.0 0.1 100 0.01 10 1.0 0.1 *%dc ERROR + %RIPPLE (PEAK) Figure 12. Values for CAV and 1% Settling Time for Stated % of Reading Averaging Error* Accuracy Includes ±2% Component Tolerance (see * in Figure) INPUT FREQUENCY (Hz) 100 0.01 1 100k 10 100 1k 10k 10 1 0.1 100 0.01 10 1 0.1 *%dc ERROR + %RIPPLE (PEAK) ACCURACY ±20% DUE TO COMPONENT TOLERANCE Figure 11. 2-Pole Sallen-Key Filter Figure 12 shows values of CAV and the corresponding averaging error as a function of sine wave frequency for the standard rms connection. The 1% settling time is shown on the right side of Figure 12. Figure 13 shows the relationship between the averaging error, signal frequency settling time, and averaging capacitor value. Figure 13 is drawn for filter capacitor values of 3.3× the averaging capacitor value. This ratio sets the magnitude of the ac and dc errors equal at 50 Hz. As an example, by using a 1 μF averaging capacitor and a 3.3 μF filter capacitor, the ripple for a 60 Hz input signal is reduced from 5.3% of the reading using the averaging capacitor alone to 0.15% using the 1-pole filter. This gives a factor of 30 reduction in ripple, and yet the settling time only increases by a factor of 3. The values of filter Capacitor CAV and Filter Capacitor C2 can be calculated for the desired value of averaging error and settling time by using Figure 13. Figure 13. Values of CAV, C2, and 1% Settling Time for Stated % of Reading Averaging Error* for 1-Pole Post Filter (see * in Figure) INPUT FREQUENCY (Hz) 100 0.01 11 10 100 1k 10k 10 1 0.1 00k 100 0.01 10 1 0.1 *%dc ERROR + %RIPPLE (PEAK) ACCURACY ±20% DUE TO COMPONENT TOLERANCE The symmetry of the input signal also has an effect on the magnitude of the averaging error. Table 5 gives the practical component values for various types of 60 Hz input signals. These capacitor values can be directly scaled for frequencies other than 60 Hz—that is, for 30 Hz, these values are doubled, and for 120 Hz they are halved. For applications that are extremely sensitive to ripple, the 2-pole configuration is suggested. This configuration minimizes capacitor values and the settling time while maximizing performance. Figure 14. Values of CAV, C2, and C3 and 1% Settling Time for Stated % of Reading Averaging Error* for 2-Pole Sallen-Key Filter (see * in Figure) Figure 14 can be used to determine the required value of CAV, C2, and C3 for the desired level of ripple and settling time. |
Аналогичный номер детали - AD637JD |
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Аналогичное описание - AD637JD |
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