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MAX7490 数据表(PDF) 16 Page - Maxim Integrated Products |
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MAX7490 数据表(HTML) 16 Page - Maxim Integrated Products |
16 / 18 page Wideband Noise The wideband noise of the filter is the total RMS value of the device’s noise spectral density and is used to determine the operating SNR. Most of its frequency contents lie within the filter’s passband and cannot be reduced with postfiltering. The total noise depends mainly on the Q of each filter section and the cascade sequence. Therefore, in multistage filters, place the section with the highest Q first for lower output noise. Multiple Filter Stages In some designs, such as very narrow band filters, or in modes where fO cannot be tuned with resistors, several 2nd-order sections with identical fO may be cascaded without multiple feedback. The total Q of the resultant filter (QT) is: Q is the Q of each individual filter section, and N is the number of 2nd-order sections. In Table 5, the total Q and total bandwidth (BW) are listed for up to five identical 2nd-order sections. B is the bandwidth of each section. Chip Information PROCESS: BiCMOS Total Q Q T N / // =− () 21 11 2 Dual Universal Switched-Capacitor Filters 16 ______________________________________________________________________________________ TOTAL SECTIONS TOTAL BW TOTAL Q 1 1.000 B 1.00 Q 2 0.644 B 1.55 Q 3 0.510 B 1.96 Q 4 0.435 B 2.30 Q 5 0.386 B 2.60 Q Table 5. Cascading Identical Bandpass Filter Sections |
类似零件编号 - MAX7490_09 |
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类似说明 - MAX7490_09 |
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