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AD7771 Datasheet(PDF) 48 Page - Analog Devices

Part # AD7771
Description  8-Channel, 24-Bit, Simultaneous Sampling ADC
PDF  99 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7771 Datasheet(HTML) 48 Page - Analog Devices

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Data Sheet
AD7771
Rev. 0 | Page 47 of 98
RMS NOISE AND RESOLUTION
Table 24 through Table 27 show the dynamic range (DR), rms
noise (RTI), effective number of bits (ENOB), and effective
resolution (ER) of the AD7771 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 24. DR and RTI for High Resolution Mode
Sinc
Filter
Decimation
Rate
Output Data
Rate (SPS)
f−3dB
(Hz)
Gain = 1
Gain = 2
Gain = 4
Gain = 8
DR
(dB)
RTI
(µV rms)
DR
(dB)
RTI
(µV rms)
DR
(dB)
RTI
(µV rms)
DR
(dB)
RTI
(µV rms)
Sinc5
16
128,000
26542.34
95.1
31.32
91.7
22.68
87.1
19.39
82.0
17.11
32
64,000
13403.14
101.8
14.31
98.5
10.30
94.4
8.41
89.7
7.37
64
32,000
6833.54
107.1
7.90
105.3
4.85
101.5
3.65
96.9
3.14
256
8,000
1906.34
114.4
3.34
113.8
1.84
111.6
1.16
107.9
0.91
Sinc3
128
16,000
4878.83
105.7
9.01
105.2
4.88
103.2
2.99
99.6
2.26
256
8,000
2756.43
112.1
4.32
111.5
2.31
109.3
1.52
105.5
1.19
512
4,000
1695.23
115.8
2.86
115.6
1.51
113.5
0.96
109.5
0.75
1024
1,000
899.33
122.0
1.39
121.6
0.73
119.6
0.47
115.7
0.36
Table 25. ENOB and ER for High Resolution Mode
Sinc
Filter
Decimation
Rate
Output Data
Rate (SPS)
f−3dB
(Hz)
Gain = 1
Gain = 2
Gain = 4
Gain = 8
ENOB
(Bits)
ER
(Bits)
ENOB
(Bits)
ER
(Bits)
ENOB
(Bits)
ER
(Bits)
ENOB
(Bits)
ER
(Bits)
Sinc5
16
128,000
26542.34
15.5
17.3
14.9
17.8
14.2
18.0
13.3
18.2
32
64,000
13403.14
16.6
18.4
16.1
18.9
15.4
19.2
14.6
19.4
64
32,000
6833.54
17.5
19.3
17.2
20.0
16.6
20.4
15.8
20.6
256
8,000
1906.34
18.7
20.5
18.6
21.4
18.2
22.0
17.6
22.4
Sinc3
128
16,000
4878.83
17.3
19.1
17.2
20.0
16.9
20.7
16.3
21.1
256
8,000
2756.43
18.3
20.1
18.2
21.0
17.9
21.6
17.2
22.0
512
4,000
1695.23
18.9
20.7
18.9
21.7
18.6
22.3
17.9
22.7
1024
1,000
899.33
20.0
21.8
19.9
22.7
19.6
23.3
18.9
23.7



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