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参数资料
型号： EVAL-AD7731EBZ
厂商： Analog Devices Inc
文件页数： 2/44页
文件大小： 0K
描述： BOARD EVALUATION FOR AD7731
标准包装： 1
ADC 的数量： 1
位数： 24
采样率（每秒）： 6.4k
数据接口： 串行
输入范围： ±1.28 V
在以下条件下的电源（标准）： 67.5mW @ 6.4kSPS
工作温度： -40°C ~ 85°C
已用 IC / 零件： AD7731
已供物品： 板，CD
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更多...
AD7731
–10–
REV. 0
OUTPUT NOISE AND RESOLUTION SPECIFICATION
The AD7731 has a number of different modes of operation of the on-chip filter and chopping features. These options are discussed
in more detail in later sections. The 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. The first mode, where the AD7731 is configured with CHP = 0 and SKIP mode enabled, provides
fast settling time while still maintaining high resolution. The 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, SKIP = 1)
Table 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 (SKIP of Filter Register = 1). The table is generated
with a master clock frequency of 4.9152 MHz. These numbers are typical and generated at a differential analog input voltage of 0V.
The output update rate is selected via the SF0 to SF11 bits of the Filter Register. Table 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
Table II represent the resolution for which there will be no code flicker within a six-sigma limit. They are not calculated based on
rms noise but on peak-to-peak noise.
The 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 Table I will remain the same for unipolar ranges. To calculate
the numbers for Table II for unipolar input ranges simply subtract one from the peak-to-peak resolution number in bits.
Table I. Output Noise vs. Input Range and Update Rate (CHP = 0, SKIP = 1)
Typical Output RMS Noise in
V
Output
–3 dB
SF
Settling
Input Range
Data Rate
Frequency
Word
Time
1.28 V
640 mV
320 mV
160 mV
80 mV
40 mV
20 mV
150 Hz
39.3 Hz
2048
20 ms
2.6
1.45
0.87
0.6
0.43
0.28
0.2
200 Hz
52.4 Hz
1536
15 ms
3.0
1.66
1.02
0.69
0.48
0.32
0.22
300 Hz
78.6 Hz
1024
10 ms
3.7
2
1.26
0.84
0.58
0.41
0.28
400 Hz
104.8 Hz
768
7.5 ms
4.2
2.3
1.46
1.0
0.69
0.46
0.32
600 Hz
157 Hz
512
5 ms
5.2
2.9
1.78
1.2
0.85
0.58
0.41
800 Hz
209.6 Hz
384
3.75 ms
6
3.3
2.1
1.4
0.98
0.66
0.47
1200 Hz
314 Hz
256
2.5 ms
7.8
4.3
2.6
1.8
1.27
0.82
0.57
1600 Hz
419.2 Hz
192
1.87 ms
10.9
5.4
3.5
2.18
1.51
0.94
0.64
2400 Hz
629 Hz
128
1.25 ms
27.1
13.9
7.3
3.5
2.22
1.24
0.83
3200 Hz
838.4 Hz
96
0.94 ms
47
24.4
11.4
5.3
3.1
1.9
1.0
4800 Hz
1260 Hz
64
0.625 ms
99
50.3
24.5
12.5
6.5
3.3
1.7
6400 Hz
1676 Hz
48
0.47 ms
193
97
48
24
11.8
6.6
3.0
Table II. Peak-to-Peak Resolution vs. Input Range and Update Rate (CHP = 0, SKIP = 1)
Peak-to-Peak Resolution in Bits
Output
–3 dB
SF
Settling
Input Range
Data Rate
Frequency
Word
Time
1.28 V
640 mV
320 mV
160 mV
80 mV
40 mV
20 mV
150 Hz
39.3 Hz
2048
20 ms
17.5
17
16.5
16
15.5
15
200 Hz
52.4 Hz
1536
15 ms
17
16.5
16
15.5
15
300 Hz
78.6 Hz
1024
10 ms
17
16.5
16
15.5
15
14.5
400 Hz
104.8 Hz
768
7.5 ms
16.5
16
15.5
15
14.5
600 Hz
157 Hz
512
5 ms
16.5
16
15.5
15
14.5
14
800 Hz
209.6 Hz
384
3.75 ms
16
15.5
15
14.5
14
1200 Hz
314 Hz
256
2.5 ms
15.5
15
14.5
14
13.5
1600 Hz
419.2 Hz
192
1.87 ms
15
15.5
15
14.5
14
13.5
2400 Hz
629 Hz
128
1.25 ms
14
13.5
13
3200 Hz
838.4 Hz
96
0.94 ms
13
12.5
4800 Hz
1260 Hz
64
0.625 ms
12
11.5
12
6400 Hz
1676 Hz
48
0.47 ms
11
REV. A
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