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AD9201ARS Arkusz danych(PDF) 11 Page - Analog Devices |
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AD9201ARS Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 20 page AD9201 –11– REV. D QREFT QREFB IREFT 0.1 F 10 F 0.1 F 0.1 F AD9201 REFSENSE AVSS 1V 0.1 F 10 F IREFB VREF 0.1 F 0.1 F 10k 10k ADC CORE INTERNAL CONTROL LOGIC 10 F 0.1 F Figure 26. Reference Buffer Equivalent Circuit and Exter- nal Decoupling Recommendation For best results in both noise suppression and robustness against crosstalk, the 4 capacitor buffer decoupling arrangement shown in Figure 26 is recommended. This decoupling should feature chip capacitors located close to the converter IC. The capacitors are connected to either IREFT/IREFB or QREFT/ QREFB. A connection to both sides is not required. DRIVING THE AD9201 Figure 27 illustrates the use of an AD8051 to drive the AD9201. Even though the AD8051 is specified with 3 V and 5 V power, the best results are obtained at ±5 V power. The ADC input span is 2 V. ADC 17 16 1k VREF AD8051 3 2 50 1k 1k 6 22 22 0.33 F 0.01 F 10pF 10pF 24 Figure 27. –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0 10 0.0E+0 2.0E+6 1.0E+6 4.0E+6 6.0E+6 8.0E+6 10.0E+6 3.0E+6 5.0E+6 7.0E+6 9.0E+6 FUND 2ND 3RD 4TH 5TH 6TH 7TH 8TH Figure 28. AD8051/AD9201 Performance |
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