User's Manual

L710HG EVB User Manual

automatically enables the power and crystal oscillator of CODEC. The switch S3 is the selection

switch of CODEC. When switching S3 to the top, CODEC uses MAX9867ETJ+ chip. When

using the MAX9867ETJ+ chip, the sound comes from the earphone, the Chinese standard

earphone needs to be plugged in. Switch S3 to the bottom, the CODEC chip is NUA8814. At this

time, the sound comes from the SPK end, and 8 ohm horn can be welded to the SPK end. Toggle

switch as shown in the figure below:

igure5-8: CODEC SWITCH S2 S3

The default audio solution on EVB development board is NAU8814, so the external audio channel

is also developed based on NAU8814. The general block diagram is as follows:

ote: Audio system is a very complicate system, it contains many factors, such as the