CS4201 Datasheet, PDF (53/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

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
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