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AD7190 데이터시트(PDF) 10 Page - Analog Devices

부품명 AD7190
상세설명  4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

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AD7190
Preliminary Technical Data
Rev.PrD 7/08 | Page 10
RMS NOISE AND RESOLUTION SPECIFICATIONS
The AD7190 can be operated with chop enabled or chop
disabled. With chop enabled, the settling time is two times the
conversion time. The offset is continuously removed by the
ADC leading to low offset and low offset drift. With chop
disabled, higher update rates can be achieved from the ADC.
The settling time is three times (sinc3) or four times (sinc4) the
selected update rate. With chop disabled, the offset is not
removed by the ADC. The offset and offset drift is comparable
between chop enabled and chop disabled for gains of 32 or
higher. For lower gains, however, periodic offset calibrations
may be required to remove offset due to drift.
SINC4 FILTER
The sinc4 filter optimizes the 50 Hz/60 Hz rejection. At the
higher update rates, it also gives better rms noise performance
compared with the sinc3 filter.
CHOP DISABLED
Table 5 shows the rms noise of the AD7190 for some of the
update rates and gain settings with chop disabled. 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. Table 6
shows the effective resolution while the output peak-to-peak
(p-p) resolution is listed in brackets. It is important to note
that the effective resolution is calculated using the rms noise,
while the p-p resolution is calculated based on peak-to-peak
noise. The p-p resolution represents the resolution for which
there will be no code flicker. These numbers are typical and
are rounded to the nearest half-LSB.
Table 5. RMS Noise (nV) vs. Gain and Output Update Rate (continuous conversion mode) Using a 5 V Reference - Chop Disabled
Filter Word
(Decimal)
Update
Rate (Hz)
Gain of 1
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
1023
4.7
174
24.71
12.65
10
8.3
7
640
7.5
196
30.28
14.52
12.28
10.37
9.5
480
10
246
38
19.33
14.14
12.00
10.26
96
50
558
87
44
35.66
27.78
25.3
16
300
1344
186
105
72.82
68.57
52.66
2
2400
4254
582
322
232
200
167
1
4800
13000
1776
900
678
497
376
Table 6. Typical Resolution (Bits) vs. Gain and Output Update Rate (continuous conversion mode) Using a 5 V Reference - Chop
Disabled
Filter Word
(Decimal)
Update
Rate (Hz)
Gain of 1
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
1023
4.7
24 (23)
24 (23)
24 (23)
24 (22)
24 (21.5)
23.5 (21)
640
7.5
24 (23)
24 (22.5)
24 (22.5)
24 (22)
24 (21.5)
23 (20.5)
480
10
24 (22.5)
24 (22.5)
24 (22)
24 (21.5)
23.5 (21)
23 (20.5)
96
50
24 (21.5)
24 (21.5)
24 (21.5)
23 (20.5)
22.5 (20)
21.5 (19)
16
300
23(20.5)
22.5 (20)
22.5 (20)
22 (19.5)
21 (18.5)
20.5 (18)
2
2400
21 (18.5)
21 (18.5)
21 (18.5)
20.5 (18)
19.5 (17)
19 (16.5)
1
4800
19.5 (17)
19.5 (17)
19.5 (17)
19 (16.5)
18 (15.5)
17.5 (15)


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