MAX98090BEWJ+T Maxim Integrated, MAX98090BEWJ+T Datasheet - Page 77

MAX98090BEWJ+T

Manufacturer Part Number

MAX98090BEWJ+T

Description

Interface - CODECs 5V 130mW Stereo Headphone Amp

Manufacturer

Maxim Integrated

Datasheet

1.MAX98090BETL.pdf (166 pages)

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MAX98090

Power and Performance Management

The device includes comprehensive power management

to allow the disabling of unused blocks to minimize sup-

ply current. In addition to this, the available power modes

provide a software configurable choice between highest

performance and reduced power consumption.

Device Performance Configuration

The Bias Control register (Table 3) selects the method

used to derive the common-mode reference voltage. A

common-mode bias created by resistive division (from the

Table 3. Bias Control Register

Table 4. DAC and Headphone Performance Mode Control Register

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BIT

BIAS_MODE

PERFMODE

ADDRESS: 0x42

ADDRESS: 0x43

DACHP

NAME

—

TYPE POR

R/W

—

Select source for BIAS.

0: BIAS derived from resistive division.

1: BIAS created by bandgap reference.

Performance Mode

Selects DAC to headphone playback performance mode:

1: Low power headphone playback mode.

0: High performance headphone playback mode.

DAC High-Performance Mode

0: DAC settings optimized for lowest power consumption.

1: DAC settings optimized for best performance.

AVDD supply) facilitates lower overall power consumption

by disabling the bandgap reference circuit. However, this

type of BIAS reference has the disadvantage of scaling

with the AVDD supply voltage (and thus also has reduced

PSRR). When derived from a bandgap reference, BIAS

is constant regardless of the supply voltage, but the addi-

tional circuitry increases power consumption.

The ADC, DAC, and headphone playback all have option-

al high-performance modes (Tables 4 and 5). In each

case, these modes trade additional power consumption

for enhanced performance. The ADC also has optional

Ultra-Low Power Stereo Audio Codec

DESCRIPTION

—

Maxim Integrated │ 77

MAX98090BEWJ+T Maxim Integrated, MAX98090BEWJ+T Datasheet - Page 77

MAX98090BEWJ+T

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