参数资料
型号: AD7747ARUZ
厂商: Analog Devices Inc
文件页数: 3/28页
文件大小: 0K
描述: IC CONV 24BIT CAP-DGTL 16-TSSOP
标准包装: 96
类型: 电容数字转换器
分辨率(位): 24 b
数据接口: 串行
电压电源: 单电源
电源电压: 2.7 V ~ 5.25 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 管件
产品目录页面: 781 (CN2011-ZH PDF)
配用: EVAL-AD7747EBZ-ND - BOARD EVAL FOR AD7747
其它名称: Q23139198
AD7747
Rev. 0 | Page 11 of 28
OUTPUT NOISE AND RESOLUTION SPECIFICATIONS
The AD7747 resolution is limited by noise. The noise
performance varies with the selected conversion time.
Table 5 shows typical noise performance and resolution for the
capacitive channel. These numbers were generated from 1000
data samples acquired in continuous conversion mode, at an
excitation of 16 kHz, ±VDD × 3/8, and with all CIN and SHLD
pins connected only to the evaluation board (no external
capacitors).
Table 6 and Table 7 show typical noise performance and
resolution for the voltage channel. These numbers were
generated from 1000 data samples acquired in continuous
conversion mode with VIN pins shorted to ground.
RMS noise represents the standard deviation and p-p noise
represents the difference between minimum and maximum
results in the data. Effective resolution is calculated from rms
noise, and p-p resolution is calculated from p-p noise.
Table 5. Typical Capacitive Input Noise and Resolution vs. Conversion Time (Bold line represents default setting)
Conversion
Time (ms)
Output Data
Rate (Hz)
3 dB Frequency
(Hz)
RMS Noise
(aF/√Hz)
RMS
Noise (aF)
P-P
Noise (aF)
Effective Resolution
(Bits)
P-P Resolution
(Bits)
22.0
45.5
43.6
28.8
190
821
16.4
14.3
23.9
41.9
39.5
23.2
146
725
16.8
14.5
40.0
25.0
21.8
11.1
52
411
18.3
15.3
76.0
13.2
10.9
11.2
37
262
18.7
15.9
124.0
8.1
6.9
11.0
29
174
19.1
16.5
154.0
6.5
5.3
10.4
24
173
19.3
16.5
184.0
5.4
4.4
10.0
21
141
19.6
16.8
219.3
4.6
4.0
9.0
18
126
19.9
17.0
Table 6. Typical Voltage Input Noise and Resolution vs. Conversion Time, Internal Voltage Reference
Conversion
Time (ms)
Output Data
Rate (Hz)
3 dB Frequency
(Hz)
RMS Noise
(μV)
P-P Noise
(μV)
Effective Resolution
(Bits)
P-P Resolution
(Bits)
20.1
49.8
26.4
11.4
62
17.6
15.2
32.1
31.2
15.9
7.1
42
18.3
15.7
62.1
16.1
8.0
4.0
28
19.1
16.3
122.1
8.2
4.0
3.0
20
19.5
16.8
Table 7. Typical Voltage Input Noise and Resolution vs. Conversion Time, External 2.5 V Voltage Reference
Conversion
Time (ms)
Output Data
Rate (Hz)
3 dB Frequency
(Hz)
RMS Noise
(μV)
P-P Noise
(μV)
Effective Resolution
(Bits)
P-P Resolution
(Bits)
20.1
49.8
26.4
14.9
95
18.3
15.6
32.1
31.2
15.9
6.3
42
19.6
16.8
62.1
16.1
8.0
3.3
22
20.5
17.7
122.1
8.2
4.0
2.1
15
21.1
18.3
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