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MAX7490 数据表(PDF) 16 Page - Maxim Integrated Products

部件名 MAX7490
功能描述  Dual Universal Switched-Capacitor Filters
Download  18 Pages
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制造商  MAXIM [Maxim Integrated Products]
网页  https://www.maximintegrated.com/en.html
标志 MAXIM - Maxim Integrated Products

MAX7490 数据表(HTML) 16 Page - Maxim Integrated Products

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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


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