AD7190 查看數據表（PDF） - Analog Devices
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AD7190 Datasheet PDF : 40 Pages
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AD7190
RMS NOISE AND RESOLUTION
The AD7190 has a choice of two filter types: sinc4 and sinc3.
In addition, the AD7190 can be operated with chop enabled
or chop disabled.
The following tables show the rms noise of the AD7190 for some
of the output data rates and gain settings with chop disabled
and enabled for the sinc4 and sinc3 filters. The numbers given
are for the bipolar input range with the external 5 V reference.
These numbers are typical and are generated with a differential
input voltage of 0 V when the ADC is continuously converting
SINC4 CHOP DISABLED
on a single channel. The effective resolution is also shown, and
the output peak-to-peak (p-p) resolution, or noise-free resol-
ution, is listed in parentheses. It is important to note that the
effective resolution is calculated using the rms noise, wheras the
p-p resolution is calculated based on peak-to-peak 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 ½ LSB.
Table 6. RMS Noise (nV) vs. Gain and Output Data Rate
Filter Word Output Data
(Decimal) Rate (Hz)
Settling
Time (ms)
Gain of 1
1023
4.7
852.5
250
640
7.5
533
310
480
10
400
330
96
50
800
900
80
60
66.7
970
32
150
26.7
1460
16
300
13.3
1900
5
960
4.17
3000
2
2400
1.67
5000
1
4800
0.83
14,300
Gain of 8
38
45
50
125
140
215
285
480
780
1920
Gain of 16
21
25
30
78
88
125
170
280
440
1000
Gain of 32
12
16
18
45
52
75
100
175
280
550
Gain of 64
10
12
14
33
36
55
75
140
220
380
Gain of 128
8.5
10.5
11.5
28
31
48
67
121
198
295
Table 7. Effective Resolution (Peak-to-Peak Resolution) vs. Gain and Output Data Rate
Filter Word
(Decimal)
1023
640
480
96
80
32
16
5
2
1
Output Data
Rate (Hz)
4.7
7.5
10
50
60
150
300
960
2400
4800
Settling
Time (ms)
852.5
533
400
800
66.7
26.7
13.3
4.17
1.67
0.83
Gain of 11
24 (22.5)
24 (22)
24 (22)
23.5 (20.5)
23.5 (20.5)
22.5 (20)
22.5 (19.5)
21.5 (19)
21 (18)
19.5 (16.5)
Gain of 81
24 (22)
24 (22)
24 (22)
23.5 (20.5)
23 (20.5)
22.5 (19.5)
22 (19.5)
21.5 (18.5)
20.5 (18)
19.5 (16.5)
Gain of 161
24 (22)
24 (22)
24 (21.5)
23 (20)
22.5 (20)
22.5 (19.5)
22 (19)
21 (18.5)
20.5 (17.5)
19.5 (16.5)
Gain of 321
24 (22)
24 (21.5)
24 (21.5)
22.5 (20)
22.5 (20)
22 (19.5)
21.5 (19)
21 (18)
20 (17.5)
19 (16.5)
Gain of 641
24 (21)
23.5 (21)
23.5 (20.5)
22 (19.5)
22 (19.5)
21.5 (18.5)
21 (18.5)
20 (17.5)
19.5 (16.5)
18.5 (16)
Gain of 1281
23 (20.5)
23 (20)
22.5 (20)
21.5 (18.5)
21.5 (18.5)
20.5 (18)
20 (17.5)
19.5 (16.5)
18.5 (16)
18 (15.5)
1 The output peak-to-peak (p-p) resolution is listed in parentheses.
Rev. 0 | Page 15 of 40
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