MAX98396 datasheet(52/172 Pages) AD

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Speaker Path

Speaker Path Block Diagram

SPEAKER DSP FEEDBACK PATH

DITHER

INVERT

DC BLOCK

FILTER

DIGITAL

GAIN

CONTROL

DAC

CLASS-DG

AMP

ANALOG

GAIN

PCM

INTERFACE

DIGITAL

VOLUME

CONTROL

THERMAL

FOLDBACK

ATTENUATION

DYNAMIC

HEADROOM

TRACKING

NOISE

GATE

FUNCTION

DIGITAL

FILTERS

BPE

DHT & BPE

ATTENUATION

FULL-SCALE GAIN /

DRE CONTROL

ATTENUATION

CORRECTION

DIGITAL

FILTERS

SPEAKER AUDIO PROCESSING BYPASS PATH

DITHER

INVERT

DC BLOCK

FILTER

TONE

GENERATOR

PINK NOISE

GENERATOR

Figure 10. Speaker Signal Path Diagram

Speaker Playback Path

The source input data to the speaker amplifier path is routed from either the PCM interface or the tone generator. The

data is then routed through digital filters, signal processing, and volume/gain control blocks before reaching the Class-DG

speaker amplifier.

Speaker Path Noise Gate

The speaker path noise gate function is enabled when the device is in the active state and the noise gate enable

(NOISEGATE_EN) is set to 1. The noise gate enable can be programmed dynamically. However, if the noise gate

function is disabled (NOISEGATE_EN is set to 0) while the noise gate is active (speaker path actively muted), the noise

gate function remains active until after it deactivates normally (unmutes the speaker path).

When the noise gate is enabled, the noise gate activates whenever the amplitude of the input audio data to the speaker

path (from the PCM interface) is below the configured mute threshold (MUTE_THRESH) for more than 1024 consecutive

data samples. When the noise gate is active, the amplifier path is muted, the current and voltage sense ADC paths output

zero code data, and the device idles in a reduced power state.

The noise gate deactivates immediately if the amplitude of a single sample from the input audio data exceeds the

configured unmute threshold (UNMUTE_THRESH). When the noise gate deactivates, the speaker path is unmuted

and returns to normal operation before the input audio data (that triggered deactivation) reaches the speaker output.

Once noise gate deactivation is complete, the current and voltage sense ADC paths resume operation and output data

normally.

The noise gate mute and unmute threshold settings are selected in terms of the number of bits (starting from the

LSB) that must be toggling (or active) in order for the input signal amplitude to exceed the thresholds. It is invalid

to set the noise gate unmute threshold (UNMUTE_THRESH) such that it is less than the configured mute threshold

(MUTE_THRESH). The location of the audio data LSB within the PCM input data channel is determined by the configured

PCM data word size (PCM_CHANSZ). The supported combinations are shown in Table 8.

MAX98396

20V Digital Input Class-DG Amplifier with I/V

Sense and Brownout Prevention

www.maximintegrated.com

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