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參數(shù)資料
| 型號(hào)： | AMC1210IRHAT |
| 英文描述： | Quad Digital Filter for 2nd-Order Delta-Sigma Modulator |
| 中文描述： | 四數(shù)字濾波器2階Δ-Σ調(diào)制器 |
| 文件頁數(shù)： | 19/47頁 |
| 文件大小： | 805K |
| 代理商： | AMC1210IRHAT |
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R
100000000
10000000
1000000
100000
10000
1000
100
10
1
1
21
41 61
81 101 121 141 161 181 201 221 241 261
Oversampling Ratio
Sinc
3
Sincfast
Sinc
2
Sinc
1
AMC1210
SBAS372A–APRIL 2006–REVISED OCTOBER 2006
These figures show the digital filter frequency response for one oversampling ratio (SOSR = 32) and a
modulator rate of 10MHz.
The general purpose of the digital filter is to average the input modulator data. Achieving higher resolution
requires additional samples for averaging, thereby increasing the total samples necessary to accurately
represent an abrupt change. It also requires additional clock cycles to complete a single sample. The ratio of
clock cycles to output samples is controlled by the SOSR value (the oversampling ratio for the sinc filter unit) in
the
Sinc Filter Parameter Register
.
Table 10
and
Figure 16
show the maximum resolution given different filter
structures and SOSR values.
Table 10. Peak Data Values for Different SOSR/Filter Combinations
SOSR
x
4
8
16
32
64
128
256
Sinc
1
±x
–4 to 4
–8 to 8
–16 to 16
–32 to 32
–64 to 64
–128 to 128
–256 to 256
Sinc
2
±x
2
–16 to 16
–64 to 64
–256 to 256
–1024 to 1024
–4096 to 4096
–16,384 to 16, 384
–65,536 to 65,536
Sinc
3
±x
3
–64 to 64
–512 to 512
–4096 to 4096
–32,768 to 32,768
–262,144 to 262,144
–2,097,152 to 2,097,152
–16,777,216 to 16,777,216
Sincfast
±2x
2
–32 to 32
–128 to 128
–512 to 512
–2048 to 2048
–8192 to 8192
–32,768 to 32,768
–131,072 to 131,072
Figure 16. Sinc Filter Resolution
19
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