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AD7785BRUZ Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD7785BRUZ
Szczegółowy opis  3-Channel, Low Noise, Low Power, 20-Bit ??? ADC with On-Chip In-Amp and Reference
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7785BRUZ Arkusz danych(HTML) 11 Page - Analog Devices

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AD7785
Rev. 0 | Page 11 of 32
OUTPUT NOISE AND RESOLUTION SPECIFICATIONS
EXTERNAL REFERENCE
Table 5 shows the output rms noise of the AD7785 for some of
the update rates and gain settings. The numbers given are for
the bipolar input range with an external 2.5 V reference. These
numbers are typical and are generated with a differential input
voltage of 0 V. Table 6 shows the effective resolution, with the
output peak-to-peak (p-p) resolution shown in parentheses. It is
important to note that the effective resolution is calculated
using the rms noise, while the p-p resolution is based on the p-p
noise. The p-p resolution represents the resolution for which
there is no code flicker. These numbers are typical and are
rounded to the nearest LSB.
Table 5. Output RMS Noise (μV) vs. Gain and Output Update Rate Using an External 2.5 V Reference
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
0.64
0.6
0.29
0.22
0.1
0.065
0.039
0.041
8.33
1.04
0.96
0.38
0.26
0.13
0.078
0.057
0.055
16.7
1.55
1.45
0.54
0.36
0.18
0.11
0.087
0.086
33.2
2.3
2.13
0.74
0.5
0.23
0.17
0.124
0.118
62
2.95
2.85
0.92
0.58
0.29
0.2
0.153
0.144
123
4.89
4.74
1.49
1
0.48
0.32
0.265
0.283
242
11.76
9.5
4.02
1.96
0.88
0.45
0.379
0.397
470
11.33
9.44
3.07
1.79
0.99
0.63
0.568
0.593
Table 6. Typical Resolution (Bits) vs. Gain and Output Update Rate Using an External 2.5 V Reference
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
20 (20)
20 (19.5)
20 (19.5)
20 (19)
20 (19)
20 (18.5)
20 (18.5)
20 (17.5)
8.33
20 (19.5)
20 (19)
20 (19)
20 (18.5)
20 (18.5)
20 (18.5)
20 (18)
19.5 (17)
16.7
20 (19)
20 (18)
20 (18.5)
20 (18)
20 (18)
20 (18)
20 (17.5)
19 (16.5)
33.2
20 (18.5)
20 (17.5)
20 (18)
20 (17.5)
20 (18)
20 (17.5)
19 (16.5)
18.5 (16)
62
20 (18)
19.5 (17)
20 (18)
20 (17.5)
20 (17.5)
19.5 (17)
19 (16.5)
18 (15.5)
123
20 (17.5)
19 (16.5)
19.5 (17)
19 (16.5)
19.5 (17)
19 (16.5)
18 (15.5)
17 (14.5)
242
18.5 (16)
18 (15.5)
18 (15.5)
18 (15.5)
18.5 (16)
18.5 (16)
17.5 (15)
16.5 (14)
470
18.5 (16)
18 (15.5)
18.5 (16)
18.5 (16)
18 (15.5)
18 (15.5)
17 (14.5)
16 (13.5)


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