AD7194 Analog Devices, AD7194 Datasheet - Page 15

• Manufacturer Part Number: AD7194
• Description: 8-Channel, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA
• Manufacturer: Analog Devices

Specifications of AD7194

• Resolution (bits): 24bit
• # Chan: 8
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

RMS NOISE AND RESOLUTION
The following tables show the rms noise, peak-to-peak noise,
effective resolution, and noise-free (peak-to-peak) resolution of
the AD7194 for various output data rates and gain settings with
chop disabled for the sinc
mode. 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 when the ADC
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
4
and sinc
Settling
Time (ms)
852.5
533
400
80
66.7
26.7
13.3
4.17
1.67
0.83
3
filters and for fast settling
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
1
24 (22.1)
24 (21.8)
24 (21.7)
23.1 (20.5)
23 (20.4)
22.4 (19.8)
21.9 (19.2)
21.1 (18.4)
20.4 (17.6)
18.6 (15.8)
Rev. 0 | Page 15 of 56
8
24 (21.8)
24 (21.5)
24 (21.3)
23 (20.3)
22.9 (20.3)
22.3 (19.6)
21.8 (19)
20.3 (17.3)
18.5 (15.7)
21 (18)
1
2200
2700
3000
6600
7200
11,000
17,000
35,000
56,000
175,000
1
370
440
470
1100
1200
1800
2500
4500
7500
26,000
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. With chop
enabled, the resolution improves by 0.5 bits.
8
480
950
8
57
73
83
150
170
260
360
640
1100
3400
340
430
1000
1600
2400
4800
7500
23,000
16
24 (21.6)
23.9 (21.2)
23.7 (21)
22.8 (20.1)
22.7 (20)
22 (19.3)
21.5 (18.8)
20.7 (17.9)
20 (17.2)
18.4 (15.7)
Gain of
16
35
41
45
85
94
150
210
370
600
1800
16
200
260
300
540
610
970
1400
2500
4200
12,000
32
24 (21.3)
23.6 (21)
23.4 (20.8)
22.5 (19.8)
22.4 (19.7)
21.8 (19)
21.2 (18.5)
20.4 (17.7)
19.6 (16.7)
18.3 (15.4)
1
Gain of
Gain of
32
18
24
28
52
56
86
130
230
380
940
32
120
150
170
350
370
580
840
1500
2900
7100
64
23.5 (20.8)
23.1 (20.6)
23 (20.3)
22 (19.3)
21.8 (19.1)
21.2 (18.5)
20.7 (17.9)
19.8 (17.1)
19.1 (16.4)
18.1 (15.4)
64
13
17
18
38
42
65
95
170
280
550
64
84
100
120
250
270
430
620
1100
1800
3600
AD7194
128
22.8 (20.1)
22.5 (19.8)
22.2 (19.6)
21.1 (18.5)
21 (18.4)
20.3 (17.7)
19.8 (17.2)
19 (16.3)
18.3 (15.5)
17.6 (14.9)
128
11
13
16
34
38
59
83
150
240
390
128
70
85
100
210
220
370
530
1000
1700
2600