MAX9879 datasheet(22/32 Pages) AD

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MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

Maxim Integrated

I2C Register Description

Zero-Crossing Detection (ZCD)

Zero-crossing detection limits distortion in the output

signal during volume transitions by delaying the transi-

tion until the mixer output crosses the internal bias volt-

age. A timeout period (typically 60ms) forces the

volume transition if the mixer output signal does not

cross the bias voltage.

1 = Zero-crossing detection is enabled.

0 = Zero-crossing detection is disabled.

Differential Input Configuration (

ΔIN_)

The inputs INA_ and INB_ can be configured for mono

differential or stereo single-ended operation.

1 = IN_ is configured as a mono differential input with

IN_2 as the positive and IN_1 as the negative input.

0 = IN_ is configured as a stereo single-ended input

with IN_2 as the right and IN_1 as the left input.

Preamplifier Gain (PGAIN_)

The preamplifier gain of INA_ and INB_ can be pro-

grammed by writing to PGAIN_.

00 = 0dB

01 = +5.5dB

10 = +20dB

11 = Reserved

I2C Address

The slave address of the MAX9879 is 1001101R/(W)

(write: 0x9A, read: 0x9B).

Table 1. Register Map

ADDRESS

POR STATE

Input Mode

Control

0x00

0x40

ZCD

ΔINA

ΔINB

PGAINA

PGAINB

Speaker

Volume

Control

0x01

0x00

SPKVOL

Left

Headphone

Volume

Control

0x02

0x00

HPLVOL

Right

Headphone

Volume

Control

0x03

0x00

HPRVOL

Output Mode

Control

0x04

0x49

SHDN

BYPASS

ENB

ENA

LSPK

RSPK

HPEN

Table 2. Input Mode Control Register

0x00

ZCD

ΔINA

ΔINB

PGAINA

PGAINB

I2C Interface

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