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AD7984 датащи(PDF) 10 Page - Analog Devices |
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AD7984 датащи(HTML) 10 Page - Analog Devices |
10 / 12 page CN-0269 Circuit Note Rev. 0 | Page 10 of 12 Figure 19. Errors vs. Switching Rate Without Front Buffer at 16-Channel Single-Ended, 14 V Step Figure 20. Errors vs. Switching Rate Without Input Buffer, 8-Channel Differential Mode, 14 V Step Figure 21. Errors vs. Switching Rate with Input Buffer, 16-Channel Single-Ended Mode, 14 V Step Figure 22. Errors vs. Switching Rate with Front Buffer, 8-Channel Differential Mode, 14 V Step Figure 23. Errors vs. Switching Rate with Input Buffer, 8-Channel Differential Mode, 2 V Step From the figures above, we can see the circuit with the input buffer has a better settling performance than the circuit without front buffer at switching rates less than 1 MHz. Figure 21, Figure 22, and Figure 23 show that with the input buffer connected the circuit settles to 16 bits at channel-to- channel switching rates up to 250 kHz. COMMON VARIATIONS The 18-bit AD7984 is available in a 10-lead MSOP or a 10-lead QFN (LFCSP) package. There are a number of other PulSAR ADCs available in the same package with 14-bit, 16-bit, and 18- bit resolutions having various sampling rates. Another possible choice for the buffer amplifiers is the AD8021. If programmable gain is required, the AD8250, AD8251, and AD8253 have 685 ns settling time to 0.001%. The ADG12xx series of multiplexers can be used if lower capacitance is required. 80 –100 –80 –60 –40 –20 0 20 40 60 1000 0 100 200 300 400 500 600 700 800 900 SWITCHING RATE (kHz) CH 2, 4, 6… 16 SETTLE TO –7V CH 1, 3, 5… 15 SETTLE TO +7V 1000 0 100 200 300 400 500 600 700 800 900 30 –40 –30 –20 –10 0 10 20 SWITCHING RATE (kHz) CH 2, 4, 6, 8 SETTLE TO –7V CH 1, 3, 5, 7 SETTLE TO +7V 1000 0 100 200 300 400 500 600 700 800 900 SWITCHING RATE (kHz) 25 –30 –25 –20 –15 –10 –5 0 5 10 15 20 CH 2, 4, 6, ...16 SETTLE TO –7V CH 1, 3, 5, ... 15 SETTLE TO +7V 1000 0 100 200 300 400 500 600 700 800 900 SWITCHING RATE (kHz) 25 –30 –25 –20 –15 –10 –5 0 5 10 15 20 CH 2, 4, 6, 8 SETTLE TO –7V CH1, 3, 5, 7 SETTLE TO +7V 1000 0 100 200 300 400 500 600 700 800 900 6 –6 –4 –2 0 2 4 SWITCHING RATE (kHz) CH 1, 3, 5, 7 SETTLE TO +1V CH 2, 4, 6, 8 SETTLE TO –1V |
Аналогичный номер детали - AD7984 |
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Аналогичное описание - AD7984 |
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