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参数资料
型号： AD7739BRU-REEL7
厂商： ANALOG DEVICES INC
元件分类： ADC
英文描述： 8-Channel, High Throughput, 24-Bit Sigma-Delta ADC
中文描述： 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24
封装： MS-153AD, TSSOP-24
文件页数： 11/32页
文件大小： 380K
代理商： AD7739BRU-REEL7
AD7739
CHOPPING DISABLED
The second mode, in which the AD7739 is configured with
chopping disabled (CHOP = 0), provides faster conversion time
while maintaining high resolution. Table 7 to Table 9 show the
–3 dB frequencies and typical performance versus the channel
conversion time and equivalent output data rate, respectively.
Table 7 shows the typical output rms noise. Table 8 shows the
typical effective resolution based on the rms noise.
Rev. 0 | Page 11 of 32
Table 9 shows the typical output peak-to-peak resolution,
representing values for which there will be no code flicker
within a 6-sigma limit. The peak-to-peak resolutions are not
calculated based on rms noise but on peak-to-peak noise.
These typical numbers are generated from 4096 data samples
acquired in continuous conversion mode with an analog input
voltage set to 0 V and MCLK = 6.144 MHz. The conversion
time is selected via the channel conversion time register.
Table 7. Typical Output RMS Noise in μV vs. Conversion Time and Input Range with Chopping Disabled
FW
Conversion
Time
Register
(μs)
(Hz)
127
0x7F
1358
737
92
0x5C
993
1007
35
0x23
399
2504
16
0x10
201
4963
12
0x0C
160
6257
11
0x0B
149
6693
3
0x03
66
15133
Input Range / RMS Noise (μV)
Conversion
Time
Output Data
Rate
–3 dB
Frequency
(Hz)
675
950
2500
5400
7250
7900
29000
±2.5 V, +2.5 V
±1.25 V, +1.25 V, ±0.625 V, +0.625 V
2.4
3.0
4.5
6.9
9.6
11.4
200
1.5
1.8
2.7
4.1
5.3
6.9
90
Table 8. Typical Effective Resolution in Bits vs. Conversion Time and Input Range with Chopping Disabled
FW
Conversion
Time
Register
(μs)
(Hz)
127
0x7F
1358
737
92
0x5C
993
1007
35
0x23
399
2504
16
0x10
201
4963
12
0x0C
160
6257
11
0x0B
149
6693
3
0x03
66
15133
Input Range / Effective Resolution (Bits)
Conversion
Time
Output Data
Rate
–3 dB
Frequency
(Hz)
675
950
2500
5400
7250
7900
29000
±2.5 V
+2.5 V
±1.25 V
+1.25 V ±0.625 V +0.625 V
21.0
20.7
20.1
19.4
18.9
18.8
14.6
20.0
19.7
19.1
18.4
17.9
17.8
13.6
20.6
20.4
19.8
19.2
18.8
18.5
14.7
19.6
19.4
18.8
18.2
17.8
17.5
13.7
19.6
19.4
18.8
18.2
17.8
17.5
13.7
18.6
18.4
17.8
17.2
16.8
16.5
12.7
Table 9. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with Chopping Disabled
FW
Conversion
Time
Register
(μs)
(Hz)
127
0x7F
1358
737
92
0x5C
993
1007
35
0x23
399
2504
16
0x10
201
4963
12
0x0C
160
6257
11
0x0B
149
6693
3
0x03
66
15133
29000
Input Range / Peak-to-Peak Resolution (Bits)
Conversion
Time
Output Data
Rate
–3 dB
Frequency
(Hz)
675
950
2500
5400
7250
7900
±2.5 V
+2.5 V
±1.25 V
+1.25 V ±0.625 V +0.625 V
18.2
17.8
17.2
16.6
16.1
16.0
11.7
17.2
16.8
16.2
15.6
15.1
15.0
10.7
17.8
17.6
17.0
16.4
16.0
15.7
12.0
16.8
16.6
16.0
15.4
15.0
14.7
11.0
16.8
16.6
16.0
15.4
15.0
14.7
11.0
15.8
15.6
15.0
14.4
14.0
13.7
10.0
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