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ADS1244IDGST Arkusz danych(PDF) 9 Page - Texas Instruments |
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ADS1244IDGST Arkusz danych(HTML) 9 Page - Texas Instruments |
9 / 25 page ADS1244 9 SBAS273 www.ti.com To help see the response at lower frequencies, Figure 7 illustrates the response out to 180Hz. Notice that both 50Hz and 60Hz signals are rejected. This feature is very useful for eliminating power line cycle interference during measure- ments. Figure 8 shows the ADS1244’s response around these frequencies. The ADS1244’s data rate and frequency response scale directly with CLK frequency. For example, if fCLK increases from 2.4576MHz to 4.9152MHz, the data rate increases from 15sps to 30sps while the notches in the response at 50Hz and 60Hz move out to 100Hz and 120Hz. SETTLING TIME The ADS1244 has single-cycle settling. That is, the output data is fully settled after a single conversion—there is no need to wait for additional conversions before retrieving the data when there is a change on the analog inputs. In order to realize single-cycle settling, synchronize changes on the analog inputs to the conversion beginning, which is indicated by the falling edge of DRDY/DOUT. For example, when using a multiplexer in front of the ADS1244, change the multiplexer’s inputs when DRDY/DOUT goes LOW. Increas- ing the time between the conversion beginning and the change on the analog inputs (tDELAY) will result in a settling error in the conversion data, as shown in Figure 9. The settling error versus delay time is shown in Figure 10. If the input change is delayed to the point where the settling error is too high, simply ignore the first data result and wait for the second conversion which will be fully-settled. FIGURE 9. Analog Input Change Timing. Begin New Conversion, Complete Previous Conversion New Conversion Complete t DELAY DRDY/DOUT V IN Previous Conversion Data FIGURE 10. Settling Error vs Delay Time. SETTLING ERROR vs DELAY TIME f CLK = 2.4576MHz Delay Time, t DELAY (ms) 2 4 6 8 10 12 14 16 0 10.000000 1.000000 0.100000 0.010000 0.001000 0.000100 0.000010 0.000001 FIGURE 7. Frequency Response to 180Hz. FIGURE 8. Frequency Response Near 50Hz and 60Hz. FREQUENCY RESPONSE TO 180Hz f CLK = 2.4576MHz Frequency (Hz) 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 FREQUENCY RESPONSE NEAR 50Hz AND 60Hz f CLK = 2.4576MHz Frequency (Hz) 50 55 60 65 45 –40 –50 –60 –70 –80 –90 –100 –110 –120 |
Podobny numer części - ADS1244IDGST |
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Podobny opis - ADS1244IDGST |
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