AD7787 データシートの表示（PDF） - Analog Devices
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AD7787 Datasheet PDF : 20 Pages
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AD7787
TYPICAL PERFORMANCE CHARACTERISTICS
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
20
40
60
80 100 120 140 160
FREQUENCY (Hz)
Figure 6. Frequency Response with 16.6 Hz Update Rate
VDD = 3V
100 VREF = 2.048V
9.5Hz UPDATE RATE
TA = 25°C
RMS NOISE = 1µV
80
9
VDD = 3V
8
VREF = 2.048V
1.1875Hz UPDATE RATE
TA = 25°C
7 RMS NOISE = 1.25µF
6
5
4
3
2
1
0
8388592
CODE
8388616
Figure 9. Noise Histogram for Clock Divide-by-8 Mode (CDIV0 = CDIV1 = 1)
8388616
60
40
20
0
8388591
CODE
8388619
Figure 7. Noise Distribution Histogram (CDIV1 = CDIV0 = 0)
8388619
VDD = 3V, VREF = 2.048V, 9.5Hz UPDATE RATE
8388591 TA = 25°C, RMS NOISE = 1µV
0
200
400
600
800
READ NO.
1000
Figure 8. Typical Noise Plot with 16.6 Hz Update Rate (CDIV1 = CD1V0 = 0)
VDD = 3V, VREF = 2.048V
1.1875Hz UPDATE RATE
TA = 25°C, RMS NOISE = 1.25µF
8388592
0
20
40
60
READ NO.
80
100
Figure 10. Noise Plot in Clock Divide-by-8 Mode (CDIV0 = CDIV1 = 1)
3.0 VDD = 5V
UPDATE RATE = 16.6Hz
TA = 25°C
2.5
2.0
1.5
1.0
0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VREF (V)
Figure 11. RMS Noise vs. Reference Voltage
Rev. 0 | Page 9 of 20
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