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AD7779 Datasheet(PDF) 31 Page - Analog Devices

Part # AD7779
Description  8-Channel, 24-Bit, Simultaneous Sampling ADC
PDF  97 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7779 Datasheet(HTML) 31 Page - Analog Devices

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Data Sheet
AD7779
Rev. 0 | Page 31 of 97
RMS NOISE AND RESOLUTION
Table 10 through Table 12 show the dynamic range (DR), rms
noise (RTI), effective number of bits (ENOB), and effective
resolution (ER) of the AD7779 for various output data 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 when the
ADC is continuously converting on a single channel.
It is important to note that the effective resolution is calculated
using the rms noise; 16,384 consecutives samples were used to
calculate the rms noise.
Effective Resolution = log2(Input Range/RMS Noise)
ENOB = (DR − 1.78)/6
HIGH RESOLUTION MODE
Table 10. DR (dB) and RTI (μVRMS) for High Resolution Mode
Decimation
Rate
Output Data Rate (SPS)
f−3dB
(Hz)
Gain
1
2
4
8
DR
RTI
DR
RTI
DR
RTI
DR
RTI
128
16000
5029.99
108.28
6.80
105.13
4.80
101
3.95
95.86
3.46
256
8000
2521.99
112.5
4.12
110.21
2.63
106.8
2.01
102
1.72
512
4000
1267.99
116.12
2.70
114.7
1.59
111.6765
1.11
107.61
0.93
1024
2000
640.99
119.5
1.87
118.3
1.07
115.82
0.70
112
0.57
2048
1000
327.49
122.37
1.33
121.55
0.74
119
0.49
115.5
0.38
Table 11. ENOB and ER for High Resolution Mode
Decimation
Rate
Output Data Rate (SPS)
f−3dB
(Hz)
Gain
1
2
4
8
ENOB
ER
ENOB
ER
ENOB
ER
ENOB
ER
128
16000
5029.99
17.75
19.49
17.23
18.99
16.54
18.27
15.68
17.46
256
8000
2521.99
18.46
20.21
18.08
19.86
17.51
19.25
16.71
18.47
512
4000
1267.99
19.06
20.82
18.82
20.58
18.32
20.10
17.64
19.36
1024
2000
640.99
19.62
21.35
19.42
21.16
19.01
20.76
18.37
20.08
2048
1000
327.49
20.1
21.84
19.97
21.69
19.54
21.28
18.96
20.66
LOW POWER MODE
Table 12. DR and RTI (μVRMS) for Low Power Mode
Decimation
Rate
Output Data Rate (SPS)
f−3dB
(Hz)
Gain
1
2
4
8
DR
RTI
DR
RTI
DR
RTI
DR
RTI
64
8000
2521.99
100
19.1
96
13.4
92
11.2
87
10.3
128
4000
1267.99
106
8.82
103
6.18
98.5
5.2
94
4.65
256
2000
640.99
112
4.53
108.5
3.03
106
2.32
100.5
2.05
512
1000
327.49
116
2.89
114
1.77
111
1.24
107
1.04
Table 13. ENOB and ER for Low Power Mode
Decimation
Rate
Output Data Rate (SPS)
f−3dB
(Hz)
Gain
1
2
4
8
ENOB
ER
ENOB
ER
ENOB
ER
ENOB
ER
64
8000
2521.99
16.37
18.00
15.71
17.51
15.04
16.77
14.21
15.89
128
4000
1267.99
17.37
19.11
16.87
18.63
16.12
17.87
15.37
17.04
256
2000
640.99
18.37
20.07
17.79
19.65
17.37
19.04
16.46
18.22
512
1000
327.49
19.04
20.72
18.71
20.43
18.21
19.94
17.54
19.20



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