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| 型号： | AD7711AARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT RTD I SOURCE 24SOIC |
| 标准包装： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 1.03k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 52.5mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 2 个差分，单极；2 个差分，双极 |
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2
AD7711A
–11–
REV. D
Table I. Output Noise vs. Gain and First Notch Frequency
First Notch of
Typical Output RMS Noise ( V)
Filter and O/P –3 dB
Gain of
Data Rate
1
Frequency
124816
32
64
128
10 Hz
2
2.62 Hz
1.0
0.78
0.48
0.33
0.25
25 Hz
2
6.55 Hz
1.8
1.1
0.63
0.5
0.44
0.41
0.38
30 Hz
2
7.86 Hz
2.5
1.31
0.84
0.57
0.45
0.43
0.4
50 Hz
2
13.1 Hz
4.33
2.06
1.2
0.64
0.54
0.46
60 Hz
2
15.72 Hz
5.28
2.36
1.33
0.87
0.63
0.62
0.6
0.56
100 Hz
3
26.2 Hz
13
6.4
3.7
1.8
1.1
0.9
0.65
250 Hz
3
65.5 Hz
130
75
25
12
7.5
4.0
2.7
1.7
500 Hz
3
131 Hz
0.6
103
0.26
103
140
70
35
25
15
8
1 kHz
3
262 Hz
3.1
103
1.6
103
0.7
103
0.29
103
180
120
70
40
NOTES
1The default condition (after the internal power-on reset) for the first notch of filter is 60 Hz.
2For these filter notch frequencies, the output rms noise is primarily dominated by device noise, and as a result, is independent of the value of the reference voltage.
Therefore, increasing the reference voltage will give an increase in the effective resolution of the device (i.e., the ratio of the rms noise to the input full scale is in-
creased since the output rms noise remains constant as the input full-scale increases).
3For these filter notch frequencies, the output rms noise is dominated by quantization noise, and as a result, is proportional to the value of the reference voltage.
Table II. Effective Resolution vs. Gain and First Notch Frequency
First Notch of
Effective Resolution
* (Bits)
Filter and O/P –3 dB
Gain of
Data Rate
Frequency
124816
32
64
128
10 Hz
2.62 Hz
22.5
21.5
21
20.5
19.5
18.5
17.5
25 Hz
6.55 Hz
21.5
21
20
19.5
18.5
17.5
16.5
30 Hz
7.86 Hz
21
20.5
20
19.5
18.5
17.5
16.5
50 Hz
13.1 Hz
20
19
18.5
17.5
16.5
60 Hz
15.72 Hz
20
19.5
19
18
17
16
100 Hz
26.2 Hz
18.5
18
17.5
17
16
250 Hz
65.5 Hz
15
15.5
15
14.5
500 Hz
131 Hz
13
12.5
1 kHz
262 Hz
10.5
11
10.5
10
*Effective resolution is defined as the magnitude of the output rms noise with respect to the input full scale (i.e., 2
VREF/GAIN). The above table applies for a VREF
of 2.5 V and resolution numbers are rounded to the nearest 0.5 LSB.
Tables I and II show the output rms noise for some typical
notch and –3 dB frequencies. The numbers given are for the
bipolar input ranges with a VREF of 2.5 V. These numbers are
typical and are generated with an analog input voltage of 0 V.
The output noise from the part comes from two sources. First,
there is the electrical noise in the semiconductor devices used in
the implementation of the modulator (device noise). Second,
when the analog input signal is converted into the digital do-
main, quantization noise is added. The device noise is at a low
level and is largely independent of frequency. The quantization
noise starts at an even lower level but rises rapidly with increas-
ing frequency to become the dominant noise source. Conse-
quently, lower filter notch settings (below 60 Hz approximately)
tend to be device noise dominated while higher notch settings
are dominated by quantization noise. Changing the filter notch
and cutoff frequency in the quantization noise dominated region
results in a more dramatic improvement in noise performance
than it does in the device noise dominated region as shown in
Table I. Furthermore, quantization noise is added after the
PGA, so effective resolution is independent of gain for the
higher filter notch frequencies. Meanwhile, device noise is
added in the PGA and, therefore, effective resolution suffers a
little at high gains for lower notch frequencies.
At the lower filter notch settings (below 60 Hz), the no missing
codes performance of the device is at the 24-bit level. At the
higher settings, more codes will be missed until at the 1 kHz
notch setting; no missing codes performance is guaranteed only
to the 12-bit level. However, since the effective resolution of the
part is 10.5 bits for this filter notch setting, this no missing codes
performance should be more than adequate for all applications.
The effective resolution of the device is defined as the ratio of
the output rms noise to the input full scale. This does not re-
main constant with increasing gain or with increasing band-
width. Table II is the same as Table I except that the output is
expressed in terms of effective resolution (the magnitude of the
rms noise with respect to 2
VREF/GAIN, i.e., the input full
scale). It is possible to do post filtering on the device to improve
the output data rate for a given –3 dB frequency and also to
further reduce the output noise (see the Digital Filtering section).
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