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AD7607 数据表(PDF) 28 Page - Analog Devices

部件名 AD7607
功能描述  8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC
PDF  32 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7607 数据表(HTML) 28 Page - Analog Devices

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AD7608
Data Sheet
Rev. A | Page 28 of 32
OVERSAMPLING BY 64
0
1000
2000
3000
4000
6000
5000
7000
–1
0
CODE
1
465
6489
1238
Figure 52. Histogram of Codes—OS × 64 (3 Codes)
When the oversampling mode is selected, this has the effect
of adding a digital filter function after the ADC. The different
oversampling rates and the CONVST x sampling frequency
produces different digital filter frequency profiles.
Figure 53 to Figure 58 show the digital filter frequency profiles
for oversampling by 2 to oversampling by 64. The combination
of the analog antialiasing filter and the oversampling digital
filter can be used to eliminate or reduce the complexity of the
design of the filter before the AD7608. The digital filtering
combines steep roll-off and linear phase response.
0
–10
–20
–30
–40
–50
–60
–70
–80
100
1k
10k
100k
10M
1M
–90
FREQUENCY (Hz)
AVCC = 5V
VDRIVE = 5V
TA = 25°C
±10V RANGE
OS BY 2
Figure 53. Digital Filter OS × 2
0
–10
–20
–30
–40
–50
–60
–70
–80
100
1k
10k
100k
10M
1M
–100
–90
FREQUENCY (Hz)
AVCC = 5V
VDRIVE = 5V
TA = 25°C
±10V RANGE
OS BY 4
Figure 54. Digital Filter Response for OS × 4
0
–10
–20
–30
–40
–50
–60
–70
–80
100
1k
10k
100k
10M
1M
–100
–90
FREQUENCY (Hz)
AVCC = 5V
VDRIVE = 5V
TA = 25°C
±10V RANGE
OS BY 8
Figure 55. Digital Filter Response for OS × 8
0
–10
–20
–30
–40
–50
–60
–70
–80
100
1k
10k
100k
10M
1M
–100
–90
FREQUENCY (Hz)
AVCC = 5V
VDRIVE = 5V
TA = 25°C
±10V RANGE
OS BY 16
Figure 56. Digital Filter Response for OS × 16



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