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AD7946 데이터시트(PDF) 9 Page - Analog Devices |
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AD7946 데이터시트(HTML) 9 Page - Analog Devices |
9 / 20 page AD7940 Rev. 0 | Page 9 of 20 TYPICAL PERFORMANCE CHARACTERISTICS Figure 5 shows a typical FFT plot for the AD7940 at 100 kSPS sample rate and 10 kHz input frequency. Figure 6 shows the signal-to-(noise + distortion) ratio performance versus the input frequency for various supply voltages while sampling at 100 kSPS with an SCLK of 2.5 MHz. Figure 7 shows a graph of the total harmonic distortion versus the analog input frequency for various supply voltages, while Figure 8 shows a graph of the total harmonic distortion versus the analog input frequency for various source impedances (see the Analog Input section). Figure 9 and Figure 10 show the typical INL and DNL plots for the AD7940. –140 –120 –100 –80 –60 –40 –20 –160 0 10k 20k 30k 40k FREQUENCY (kHz) 50k 0 VDD = 4.75V FSAMPLE = 100kSPS FIN = 10kHz SNR = 84.48dB SINAD = 84.35dB THD = –98.97dB SFDR = –100.84dB Figure 5. AD7940 Dynamic Performance at 100 kSPS 80 85 75 10 INPUT FREQUENCY (kHz) 100 90 FSAMPLE = 100kSPS TA = 25°C VDD = 5.25V VDD = 4.75V VDD = 2.5V VDD = 4.3V VDD = 3.6V VDD = 3V VDD = 2.7V Figure 6. AD7940 SINAD vs. Analog Input Frequency for Various Supply Voltages at 100 kSPS 90 100 80 10 INPUT FREQUENCY (kHz) 100 110 85 95 105 FSAMPLE = 100kSPS TA = 25°C VDD = 3V VDD = 2.7V VDD = 4.3V VDD = 2.5V VDD = 5.25V VDD = 4.75V VDD = 3.6V Figure 7. AD7940 THD vs. Analog Input Frequency for Various Supply Voltages at 100 kSPS 90 100 70 75 10 INPUT FREQUENCY (kHz) 100 110 85 80 95 105 FSAMPLE = 100kSPS TA = 25°C VDD = 4.75V RIN = 10Ω RIN = 50Ω RIN = 100Ω RIN = 1000Ω Figure 8. AD7940 THD vs. Analog Input Frequency for Various Source Impedances |
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