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AD7949 Arkusz danych(PDF) 9 Page - Analog Devices |
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AD7949 Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 32 page AD7949 Rev. B | Page 9 of 32 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 2.5 V to 5.5 V, VREF = 2.5 V to 5 V, VIO = 2.3 V to VDD, unless otherwise noted.. 1.0 0.5 0 –0.5 –1.0 0 4,096 8,192 12,288 16,384 CODES Figure 5. Integral Nonlinearity vs. Code, VREF = VDD = 5 V 300k 250k 200k 150k 100k 50k 0 1FFC CODE IN HEX 1FFD 1FFE 1FFF 2000 2001 2002 2003 00 0 1 0 00 0 VREF = VDD = 5V 261,120 Figure 6. Histogram of a DC Input at Code Center 0 –20 –40 –60 –80 –100 –120 –140 –160 050 25 75 100 125 FREQUENCY (kHz) VREF = VDD = 5V fS= 250kSPS fIN = 19.9kHz SNR = 85.3dB SINAD = 85.2dB THD = –100dB SFDR = 103dB SECOND HARMONIC = –110dB THIRD HARMONIC = –103dB Figure 7. 20 kHz FFT, VREF = VDD = 5 V CODES 0 4,096 8,192 12,288 16,384 1.0 0.5 0 –0.5 –1.0 Figure 8. Differential Nonlinearity vs. Code, VREF = VDD = 5 V CODE IN HEX 259,473 300k 250k 200k 150k 100k 50k 0 1FFC 1FFD 1FFE 1FFF 2000 2001 2002 2003 2004 00 0 955 693 00 0 VREF = VDD = 2.5V Figure 9. Histogram of a DC Input at Code Center 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 050 25 75 100 FREQUENCY (kHz) VREF = VDD = 2.5V fs= 200kSPS fIN = 19.9kHz SNR = 84.2dB SINAD = 82.4dB THD = –84dB SFDR = 85dB SECOND HARMONIC = –100dB THIRD HARMONIC = –85dB Figure 10. 20 kHz FFT, VREF = VDD = 2.5 V |
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