CS4353_09 Datasheet, PDF (20/26 Pages) Cirrus Logic – 3.3 V Stereo Audio DAC with 2 VRMS Line Output

CS4353
4.10 Grounding and Power Supply Arrangements
As with any high-resolution converter, the CS4353 requires careful attention to power supply and grounding
arrangements if its potential performance is to be realized. Figure 3 shows the recommended power ar-
rangements, with VCP, VA, and VL connected to clean supplies. It is strongly recommended that a single
ground plane be used, with the DGND, CPGND, and AGND pins all connected to this common plane.
Should it be necessary to split the ground planes, the DGND and CPGND pins should be connected to the
digital ground plane and the AGND pin should be connected to the analog ground plane. In this configura-
tion, it is critical that the digital and analog ground planes be tied together with a low-impedance connection,
ideally a strip of copper on the printed circuit board, at a single point near the CS4353.
All signals, especially clocks, should be kept away from the VBIAS pin in order to avoid unwanted coupling
into the DAC.
4.10.1 Capacitor Placement
Decoupling capacitors should be placed as close to the device as possible, with the low-value ceramic
capacitor being the closest. To further minimize impedance, these capacitors should be located on the
same PCB layer as the device. If desired, all supply pins may be connected to the same supply, but a
decoupling capacitor should still be placed on each supply pin. See DC Electrical Characteristics for the
voltage present across pin pairs. This is useful for choosing appropriate capacitor voltage ratings and ori-
entation if electrolytic capacitors are used.
The CDB4353 evaluation board demonstrates the optimum layout and power supply arrangements.
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