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AD4884BBCZ bảng dữ liệu(PDF) 84 Page - Analog Devices |
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AD4884BBCZ bảng dữ liệu(HTML) 84 Page - Analog Devices |
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84 / 116 page  Data Sheet AD4884 DIGITAL FEATURES analog.com Rev. 0 | 84 of 116 DIGITAL FILTER Each AD4884 channel includes the option of enabling its integrated digital filter for applications where noise rejection by bandwidth limiting is required. As shown in Figure 132 and detailed as follows, there are four paths available by which to route digital data: no digital filtering, a sinc1 filter, a sinc5 filter, or a sinc5 compensated filter. Further details on each of these filters are described in the following sections. To ensure the first filter result produces the correct data, when a user makes a change to the filter selection, a reset must be issued via the GPIO pin configured for filter synchronization (FILTER_SYNC). Figure 132. Digital Filter Selection Options Benefits of Digital Filtering The ADC result path of each channel can be configured to use the integrated digital filter feature. The filter configuration register (see the Filter Configuration Register section, Address 0x29) con- tains the FILTER_SEL bits that allow the user to bypass (default register setting) the digital filter or select from one of three filter options. Each filter has unique bandwidth profile properties, which allows high flexibility in allowing selection to be made depending on the end application requirements. Table 28 shows the −3dB bandwidths achievable for each user-selectable filter type. The SINC_DEC_RATE bits controls the bandwidth and the data decima- tion factor. These filters allow the user to programmatically control the noise bandwidth of their signal chain and also can offer benefits by reduc- ing the amount of filtering required in the analog front end, while offering dynamic range improvement without the need for additional components. The digital filter response sections have additional details on the different filter profiles that include the following: ► Sinc1 has a wider bandwidth but is not optimized for pass-band flatness. ► Sinc5 has a flatter pass-band response, however, with a reduced bandwidth. ► Sinc5 + compensation is a filter highly optimized to give excellent pass-band flatness with a ripple within ±0.1dB. Table 28. Filter Bandwidth Filter Type SINC_DEC_RATE Decimation −3dB Bandwidth Sinc1 0000 2 0.25 × fS Sinc1 0001 4 0.114 × fS Sinc1 0010 8 0.056 × fS Sinc1 0011 16 0.028 × fS Sinc1 0100 32 0.014 × fS Sinc1 0101 64 0.007 × fS Sinc1 0110 128 0.0035 × fS Sinc1 0111 256 0.0017 × fs Sinc1 1000 512 0.0009 × fS Sinc1 1001 1024 0.0004 × fS Sinc5 0000 2 0.117 × fS Sinc5 0001 4 0.0525 × fS Sinc5 0010 8 0.0256 × fS Sinc5 0011 16 0.0127 × fS Sinc5 0100 32 0.0064 × fS Sinc5 0101 64 0.0032 × fS Sinc5 0110 128 0.0016 × fS Sinc5 0111 256 0.0008 × fS Sinc5 + Compensation 0000 4 0.1015 × fS Sinc5 + Compensation 0001 8 0.0506 × fS Sinc5 + Compensation 0010 16 0.0253 × fS |
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