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AD7190 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD7190
Szczegółowy opis  4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7190 Arkusz danych(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
AD7190
Rev.PrD 7/08 | Page 11
CHOP ENABLED
Table 7 shows the AD7190’s rms noise for some of the update
rates and gain settings. The numbers given are for the bipolar
input range with an external 5 V reference. These numbers are
typical and are generated with a differential input voltage of 0 V.
Table 8 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 7. RMS Noise (nV) vs. Gain and Output Update Rate (continuous conversion mode) Using a 5 V Reference - Chop Enabled
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
1.175
123
17.47
8.94
7.07
5.87
5
640
1.875
138
21.41
10.27
8.68
7.33
7.07
480
2.5
174
26.87
13.67
10
8.49
7.25
96
12.5
395
61.52
31.11
25.22
19.64
17.9
16
75
950
132
74.25
51.5
48.49
37.24
2
600
3008
412
228
164
141
118
1
1200
9192
1255
636
479
351
266
Table 8. Typical Resolution (Bits) vs. Gain and Output Update Rate (continuous conversion mode) Using a 5 V Reference - Chop
Enabled
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
1.175
24 (23.5)
24 (23.5)
24 (23.5)
24 (22.5)
24 (22)
24 (21.5)
640
1.875
24 (23.5)
24 (23)
24 (23)
24 (22.5)
24 (21.5)
23.5 (21)
480
2.5
24 (23)
24 (22.5)
24 (22.5)
24 (22)
24 (21.5)
23 (20.5)
96
12.5
24 (22)
24 (21.5)
24 (21.5)
23.5 (21)
23 (20.5)
22 (19.5)
16
75
23.5 (21)
23 (20.5)
23 (20.5)
22.5 (20)
21.5 (19)
21 (18.5)
2
600
21.5 (19)
21.5 (19)
21.5 (19)
21 (18.5)
20 (17.5)
19.5 (17)
1
1200
20 (17.5)
20 (17.5)
20 (17.5)
19.5 (17)
18.5 (16)
18 (15.5)


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