CS4201 查看數據表（PDF） - Cirrus Logic
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CS4201 Datasheet PDF : 68 Pages
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CS4201
10.4 Power Supplies
The power supplies providing analog power should
be as clean as possible to minimize coupling into
the analog section which could degrade analog per-
formance. One analog power pin, AVdd2, supplies
power to the headphone amplifier on the CS4201.
The other analog power pin, AVdd1, supplies pow-
er to the rest of the CS4201 analog circuitry. The
+5 V analog supply should be generated from a
voltage regulator (7805 type) connected to a +12 V
supply. This helps isolate the analog circuitry from
noise typically found on +5 V digital supplies. A
typical voltage regulator circuit for analog power
using a MC78M05CDT +5V regulator is shown in
Figure 26. The digital power pins, DVdd1 and
DVdd2, should be connected to the same digital
supply as the controller’s AC-link interface. Since
the digital interface on the CS4201 may operate at
either +3.3 V or +5 V, proper connection of these
pins will depend on the digital power supply of the
controller.
10.5 Reference Design
See Section 14 for a CS4201 reference design.
+12VD
MC78M05CDT
1
IN
3
OUT
0.1 µ F
Y5V
10 µ F
ELEC
GND
2
+5VA
0.1 µ F
Y5V
10 µ F
ELEC
DGND
AGND
Figure 26. +5V Analog Voltage Regulator
DS483PP3
53
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