Texas Instruments DIYAMP-SOT23-EVM, Руководство пользователя, Страница: 8 / 35

c _ Vref
1 2 2
1
2 R / / R C
=
p ´ ´
f
Schematic and PCB Layout
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8 SBOU191 – July 2017
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DIYAMP-SOT23-EVM
The single-supply, MFB filter circuit can be configured as a low-pass filter, high-pass filter, or band-pass
filter based on the component selection of Z1 through Z5.
Table 3 displays the type of passive component
that should be chosen for Z1 through Z5 for each filter configuration.
Table 3. MFB Filter Type Component Selection
Pass-Band
Filter Type
Type of
Component (Z1)
Type of
Component (Z2)
Type of
Component (Z3)
Type of
Component (Z4)
Type of
Component (Z5)
Low Pass R1 C2 R3 R4 C5
High Pass C1 R2 C3 C4 R5
Band Pass R1 R2 C3 C4 R5
For additional guidance in designing a filter, download FilterPro™ active filter design software.
Capacitor C2 provides the option to filter noise that may be introduced from the Vref input. calculates the
cutoff frequency due to C2.
(1)
The PCB layout of the top layer of the single-supply, MFB filter configuration is displayed in Figure 10 .
Figure 10. Single-Supply, MFB Filter Top Layer
The PCB layout of the bottom layer of the single-supply, MFB filter configuration is displayed in Figure 11 .
Figure 11. Single-Supply, MFB Filter Bottom Layer