MAX9867 datasheet(49/55 Pages) MAXIM

49 / 55 page

Ultra-Low Power Stereo Audio Codec

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ACKNOWLEDGE FROM MAX9867

1 BYTE

AUTOINCREMENT INTERNAL

ACKNOWLEDGE FROM MAX9867

R/W

REPEATED START

SLAVE ADDRESS

DATA BYTE

Figure 15. Reading n Bytes of Data from the MAX9867

Applications Information

Proper layout and grounding are essential for optimum

performance. When designing a PCB for the MAX9867,

partition the circuitry so that the analog sections of the

MAX9867 are separated from the digital sections. This

ensures that the analog audio traces are not routed

near digital traces.

Use a large continuous ground plane on a dedicated

layer of the PCB to minimize loop areas. Connect

AGND and DGND directly to the ground plane using

the shortest trace length possible. Proper grounding

improves audio performance, minimizes crosstalk

between channels, and prevents any digital noise from

coupling into the analog audio signals.

Ground the bypass capacitors on MICBIAS, REG,

PREG, and REF directly to the ground plane with mini-

mum trace length. Also be sure to minimize the path

length to AGND. Bypass AVDD directly to AGND.

Connect all digital I/O termination to the ground plane

with minimum path length to DGND. Bypass DVDD and

DVDDIO directly to DGND.

Route microphone signals from the microphone to the

MAX9867 as a differential pair, ensuring that the posi-

tive and negative signals follow the same path as close-

ly as possible with equal trace length. When using

single-ended microphones or other single-ended audio

sources, ground the negative microphone input as near

as possible to the audio source and then treat the posi-

tive and negative traces as differential pairs.

The MAX9867 TQFN package features an exposed

thermal pad on its underside. Connect the exposed

thermal pad to AGND.

An evaluation kit (EV Kit) is available to provide an

example layout for the MAX9867. The EV kit allows

quick setup of the MAX9867 and includes easy-to-use

software, allowing all internal registers to be controlled.

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