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AD7785 Datasheet(PDF) 13 Page - Analog Devices

Part # AD7785
Description  3-Channel, Low Noise, Low Power, 20-Bit ??? ADC with On-Chip In-Amp and Reference
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7785 Datasheet(HTML) 13 Page - Analog Devices

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AD7785
Rev. 0 | Page 13 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
8388800
8388450
8388500
8388550
8388600
8388650
8388700
8388750
0
1000
800
600
400
200
READING NUMBER
Figure 6. Typical Noise Plot (Internal Reference, Gain = 64,
Update Rate = 16.7 Hz)
16
0
2
4
6
8
10
12
14
8388482
8388750
8388720
8388680
8388640
8388600
8388560
8388520
CODE
Figure 7. Noise Distribution Histogram
(Internal Reference, Gain = 64, Update Rate = 16.7 Hz)
20
10
0
–2.0 –1.2 –0.8 –0.4
0
0.4
0.8
1.2
1.6
2.0
MATCHING (%)
Figure 8. Excitation Current Matching (210 μA) at Ambient
Temperature
20
10
0
–1.75 –1.05 –0.70 –0.35
0
0.35 0.70 1.05 1.40 1.75
MATCHING (%)
Figure 9. Excitation Current Matching (1 mA) at Ambient Temperature
90
80
70
60
50
40
30
20
10
0
0
200
400
600
800
1000
LOAD CAPACITANCE (nF)
Figure 10. Bias Voltage Generator Power-Up Time vs. Load Capacitance
3.0
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
REFERENCE VOLTAGE (V)
VDD = 5V
UPDATE RATE = 16.6Hz
TA = 25°C
Figure 11. RMS Noise vs. Reference Voltage (Gain = 1)



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