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參數(shù)資料
型號： AD7731BN
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： Low Noise, High Throughput 24-Bit Sigma-Delta ADC
中文描述： 6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDIP24
封裝： MS-001, PLASTIC, DIP-24
文件頁數(shù)： 10/44頁
文件大小： 411K
代理商： AD7731BN
AD7731
–10–
REV. 0
OUT PUT NOISE AND RE SOLUT ION SPE CIFICAT ION
T he AD7731 has a number of different modes of operation of the on-chip filter and chopping features. T hese options are discussed
in more detail in later sections. T he part can be programmed either to optimize the throughput rate and settling time or to optimize
noise and drift performance. Noise tables for two of the primary modes of operation of the part are outlined below for a selection of
output rates and settling times. T he first mode, where the AD7731 is configured with CHP = 0 and SK IP mode enabled, provides
fast settling time while still maintaining high resolution. T he second mode, where CHP = 1 and the full second filter is included,
provides very low noise numbers with lower output rates. Settling time refers to the time taken to get an output that is 100% settled
to the new value after a channel change or exercising
SYNC
.
Output Noise (CHP = 0, SK IP = 1)
T able I shows the output rms noise for some typical output update rates and –3 dB frequencies for the AD7731 when used in
nonchop mode (CHP of Filter Register = 0) and with the second filter bypassed (SK IP of Filter Register = 1). T he table is generated
with a master clock frequency of 4.9152 MHz. T hese numbers are typical and generated at a differential analog input voltage of 0V.
T he output update rate is selected via the SF0 to SF11 bits of the Filter Register. T able II, meanwhile, shows the output peak-to-
peak resolution in bits (rounded to the nearest 0.5 LSB) for the same output update rates. It is important to note that the numbers in
T able II represent the resolution for which there will be no code flicker within a six-sigma limit. T hey are not calculated based on
rms noise but on peak-to-peak noise.
T he numbers are generated for the bipolar input ranges. When the part is operated in unipolar mode, the output noise will be the
same as the equivalent bipolar input range. As a result, the numbers in T able I will remain the same for unipolar ranges. T o calculate
the numbers for T able II for unipolar input ranges simply subtract one from the peak-to-peak resolution number in bits.
T able I. Output Noise vs. Input Range and Update Rate (CHP = 0, SKIP = 1)
T ypical Output RMS Noise in
m
V
Output
Data Rate
–3 dB
Frequency
SF
Word
Settling
T ime
Input Range
6
160 mV
6
1.28 V
6
640 mV
6
320 mV
6
80 mV
6
40 mV
6
20 mV
150 Hz
200 Hz
300 Hz
400 Hz
600 Hz
800 Hz
1200 Hz
1600 Hz
2400 Hz
3200 Hz
4800 Hz
6400 Hz
39.3 Hz
52.4 Hz
78.6 Hz
104.8 Hz
157 Hz
209.6 Hz
314 Hz
419.2 Hz
629 Hz
838.4 Hz
1260 Hz
1676 Hz
2048
1536
1024
768
512
384
256
192
128
96
64
48
20 ms
15 ms
10 ms
7.5 ms
5 ms
3.75 ms
2.5 ms
1.87 ms
1.25 ms
0.94 ms
0.625 ms
0.47 ms
2.6
3.0
3.7
4.2
5.2
6
7.8
10.9
27.1
47
99
193
1.45
1.66
2
2.3
2.9
3.3
4.3
5.4
13.9
24.4
50.3
97
0.87
1.02
1.26
1.46
1.78
2.1
2.6
3.5
7.3
11.4
24.5
48
0.6
0.69
0.84
1.0
1.2
1.4
1.8
2.18
3.5
5.3
12.5
24
0.43
0.48
0.58
0.69
0.85
0.98
1.27
1.51
2.22
3.1
6.5
11.8
0.28
0.32
0.41
0.46
0.58
0.66
0.82
0.94
1.24
1.9
3.3
6.6
0.2
0.22
0.28
0.32
0.41
0.47
0.57
0.64
0.83
1.0
1.7
3.0
T able II. Peak-to-Peak Resolution vs. Input Range and Update Rate (CHP = 0, SKIP = 1)
Peak-to-Peak Resolution in Bits
Output
Data Rate
–3 dB
Frequency
SF
Word
Settling
T ime
Input Range
6
160 mV
6
1.28 V
6
640 mV
6
320 mV
6
80 mV
6
40 mV
6
20 mV
150 Hz
200 Hz
300 Hz
400 Hz
600 Hz
800 Hz
1200 Hz
1600 Hz
2400 Hz
3200 Hz
4800 Hz
6400 Hz
39.3 Hz
52.4 Hz
78.6 Hz
104.8 Hz
157 Hz
209.6 Hz
314 Hz
419.2 Hz
629 Hz
838.4 Hz
1260 Hz
1676 Hz
2048
1536
1024
768
512
384
256
192
128
96
64
48
20 ms
15 ms
10 ms
7.5 ms
5 ms
3.75 ms
2.5 ms
1.87 ms
1.25 ms
0.94 ms
0.625 ms
0.47 ms
17.5
17
17
16.5
16.5
16
15.5
15
14
13
12
11
17
17
16.5
16.5
16
16
15.5
15.5
14
13
12
11
17
16.5
16.5
16
16
15.5
15.5
15
14
13
12
11
16.5
16.5
16
15.5
15.5
15
15
14.5
14
13
12
11
16
16
15.5
15.5
15
14.5
14.5
14
13.5
13
12
11
15.5
15.5
15
15
14.5
14.5
14
14
13.5
13
11.5
11
15
15
14.5
14.5
14
14
13.5
13.5
13
12.5
12
11
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