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CS6420 Datasheet(PDF) 21 Page - Cirrus Logic |
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CS6420 Datasheet(HTML) 21 Page - Cirrus Logic |
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21 / 52 page  CS6420 DS205PP2 21 Noise and Grounding Since the CS6420 is a mixed-signal integrated cir- cuit, the system designer must pay special attention to layout and decoupling to minimize noise con- cerns. The three best methods to reduce noise when using the CS6420 are to have good decoupling of power supplies, separation of analog and digital power and ground, and careful board layout. Figure 6 shows the suggested placement of decou- pling capacitors for the power supplies. Note that the trace length from the power pin to the capaci- tors is minimized. Also note that the smaller valued capacitor is placed closer to the pin than the larger valued capacitor. The smaller capacitor decouples high frequency noise and the larger capacitor atten- uates lower frequencies. The separation of analog and digital power and ground is done in two ways. The power is separated by deriving the digital power for the CS6420 from the analog through a ferrite bead to isolate analog from digital, as shown in Figure 7. The ferrite bead serves as a low-pass filter to remove CS6420 digi- tal switching noise from the analog power supply. The ground is separated by isolating all the digital components of the system board on one ground plane and all the analog and linear components on a different ground plane. The CS6420 should be placed over the analog ground plane. This prevents digital switching noise from the digital components of the board from coupling into the converters and aliasing into the passband. +5V (Analog) AVDD AGND DVDD DGND Analog Ground Plane Digital Ground Plane Microcontroller 1 µF0.1µF0.1µF1µF Ferrite Bead Figure 7. Ground Planes |
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