AD7195 Analog Devices, AD7195 Datasheet - Page 13

• Manufacturer Part Number: AD7195
• Description: 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA and AC Excitation
• Manufacturer: Analog Devices

Specifications of AD7195

• Resolution (bits): 24bit
• # Chan: 4
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Bip,SE-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

RMS NOISE AND RESOLUTION
The tables in this section show the rms noise, peak-to-peak
noise, effective resolution, and noise-free (peak-to-peak) resolu-
tion of the AD7195 for various output data rates and gain settings,
with chop disabled and chop enabled for the sinc
filters. The numbers given are for the bipolar input range with
the external 5 V reference. These numbers are typical and are
SINC
Table 6. RMS Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
1023
640
480
96
80
32
16
5
2
1
Table 7. Peak-to-Peak Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
1023
640
480
96
80
32
16
5
2
1
Table 8. 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
1
The output peak-to-peak (p-p) resolution is listed in parentheses.
4
CHOP DISABLED
Output Data
Rate (Hz)
4.7
7.5
10
50
60
150
300
960
2400
4800
Output Data
Rate (Hz)
4.7
7.5
10
50
60
150
300
960
2400
4800
Output Data
Rate (Hz)
4.7
7.5
10
50
60
150
300
960
2400
4800
Settling
Time (ms)
852.5
533
400
80
66.7
26.7
13.3
4.17
1.67
0.83
Settling
Time (ms)
852.5
533
400
80
66.7
26.7
13.3
4.17
1.67
0.83
Settling
Time (ms)
852.5
533
400
80
66.7
26.7
13.3
4.17
1.67
0.83
Gain of 1
280
390
470
1000
1100
1460
1900
3000
5000
14,300
Gain of 1
1600
2200
3000
6000
7200
8300
11,000
20,000
32,000
86,000
Gain of 1
24 (22.6)
24 (22.1)
24 (21.7)
23.3 (20.7)
23.1 (20.4)
22.7 (20.2)
22.3 (19.8)
21.7 (18.9)
20.9 (18.3)
19.4 (16.8)
4
and sinc
1
3
Gain of 8
Gain of 8
96
120
130
150
170
220
285
480
780
1920
500
650
670
900
1100
1500
1700
3000
5100
13,000
Gain of 8
23.6 (21.3)
23.4 (20.9)
23.3 (20.8)
23 (20.4)
22.8 (20.1)
22.4 (19.7)
22.1 (19.5)
21.3 (18.7)
20.6 (17.9)
19.3 (16.6)
Rev. 0 | Page 13 of 44
1
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, whereas the peak-to-peak resolution is calculated based
on peak-to-peak noise. The peak-to-peak resolution represents
the resolution for which there is no code flicker.
Gain of 16
23.6 (21.3)
23.4 (20.9)
23.3 (20.8)
22.9 (20.4)
22.8 (20)
22.3 (19.7)
21.8 (19.3)
21.1 (18.4)
20.4 (17.7)
19.3 (16.4)
Gain of 16
50
54
56
78
88
125
170
280
440
1000
Gain of 16
250
290
300
450
480
750
1000
1800
2800
6000
1
Gain of 32
23.6 (21.2)
23.4 (20.9)
23.3 (20.8)
22.7 (20.1)
22.5 (20 )
22 (19.5)
21.6 (19)
20.8 (18.1)
20.1 (17.5)
19.1 (16.4)
Gain of 32
22
28
31
45
52
75
100
175
280
550
Gain of 32
130
150
190
280
300
410
600
1100
1700
3500
1
Gain of 64
10
12
14
33
36
55
75
140
220
380
Gain of 64
65
80
100
180
220
340
440
810
1400
2400
Gain of 64
23.6 (21.2)
23.4 (20.9)
23.3 (20.6)
22.2 (19.7)
22.1 (19.4)
21.5 (18.8)
21 (18.4)
20.2 (17.6)
19.5 (16.8)
18.8 (16)
1
Gain of 128
8.5
10.5
11.5
28
31
48
67
121
198
295
Gain of 128
56
65
70
170
190
310
430
710
1200
1900
Gain of 128
23.1 (20.4)
22.8 (20.2)
22.7 (20.1)
21.4 (18.8)
21.3 (18.6)
20.6 (17.9)
20.1 (17.5)
19.3 (16.7)
18.6 (16)
18 (15.3)
AD7195
1