Advanced Information

WM8816

WOLFSON MICROELECTRONICS LTD

AI Rev 1.1 September 2000

9

Figure 4 FFT of output signal with 10kHz, 1V rms sine wave input

POWER SUPPLY DECOUPLING

For best audio performance, all digital activities should be avoided during analogue signal

processing. Special attention should be paid to power and ground decoupling. If possible separate

analogue and digital power supplies should be used. A clean analogue power supply should be used

for AVDD. DVDD should be the same as AVDD to avoid latch-up phenomena. Decoupling capacitors

should be located as close to the WM8816 as possible.

5k

30k

10k

15k

20k

25k

Frequency (Hz)

-140

+0

-120

-100

-80

-60

-40

-20

d

B

V