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AD7791 Datasheet(PDF) 9 Page - Analog Devices |
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AD7791 Datasheet(HTML) 9 Page - Analog Devices |
9 / 20 page AD7791 Rev. 0 | Page 9 of 20 TYPICAL PERFORMANCE CHARACTERISTICS 04227-0-012 –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 040 80 20 60 100 120 140 160 0 FREQUENCY (Hz) Figure 6. Frequency Response with 16.6 Hz Update Rate 04227-0-010 0 20 8388591 8388619 40 60 80 100 CODE VDD = 3V VREF = 2.048V 9.5Hz UPDATE RATE TA = 25°C RMS NOISE = 1 µV Figure 7. Noise Distribution Histogram (CDIV1 = CDIV0 = 0) 04227-0-011 8388591 0 200 400 600 800 1000 8388619 READ NO. VDD = 3V, VREF = 2.048V, 9.5Hz UPDATE RATE TA = 25°C, RMS NOISE = 1µV Figure 8. Typical Noise Plot with 16.6 Hz Update Rate (CDIV1 = CDIV0 = 0) 04227-0-014 0 1 2 3 4 5 6 7 8 8388592 8388616 9 CODE VDD = 3V VREF = 2.048V 1.1875Hz UPDATE RATE TA = 25°C RMS NOISE = 1.25 µF Figure 9. Noise Histogram for Clock Divide by 8 Mode (CDIV0 = CDIV1 = 1) 04227-0-013 8388592 0 20406080 100 8388616 READ NO. VDD = 3V, VREF = 2.048V 1.1875Hz UPDATE RATE TA = 25°C, RMS NOISE = 1.25µF Figure 10. Noise Plot in Clock Divide by 8 Mode (CDIV0 = CDIV1 = 1) 04227-0-015 0 0.5 1.0 1.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.0 2.5 2.0 VREF (V) VDD = 5V UPDATE RATE = 16.6Hz TA = 25°C Figure 11. RMS Noise vs. Reference Voltage |
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