ACS32201 datasheet(7/65 Pages) IDT

7 / 65 page

IDT CONFIDENTIAL

V0.6 07/11

ACS32201

LOW-POWER, HIGH-FIDELITY, CLASS-D AMPLIFIER

1. OVERVIEW

1.1.

Block Diagrams

The ACS32201 is an advanced digital Class-D amplifier. To support the design of audio subsystems in a portable

device, the ACS32201 features an intelligent architecture with advanced audio processing algorithms and a 1W/chan-

nel filterless stereo class D amplifier.

Figure 1. ACS32201 Block Diagram

1.2.

Audio Outputs

To enhance the sound available from the small, low-power speakers typically found in a portable device, the ACS32201

provides numerous audio enhancement capabilities. The ACS32201 features dual, independent, programmable

left/right 6-band equalization, allowing the system designer to provide an advanced system equalizer to accommodate

the specific speakers and enclosure design. A compressor/limiter features programmable attack and release thresh-

olds, enabling the system designer to attenuate loud noise excursions to avoid speaker artifacts, thus allowing the

underlying content to be played at a louder volume without distortion. For compressed audio, a programmable

expander is available to help restore the dynamic range of the original content. A stereo depth enhancement algorithm

allows common left/right content (e.g. dialog) to be attenuated separately from other content, providing a perceived

depth separation between background and foreground audio. Psychoacoustic bass and treble enhancement algo-

rithms achieve a rich, full tone even from originally compressed content, and even with speakers generally unable to

play low-frequency sounds.

PLL

Audio Processing

Bass/Treble Enhancement

SYSTEM EQ

SPEAKER EQ

3-D effect

Compressor-limiter

Dynamic Range Expander

DAC Left

Class D Left+

BTL

Digital PWM

controller

DACIN

Class D Right+

DAC Right

Clocking

Control

I2C_SCL

I2C_SDA

DACLRCLK

DACBCLK

MCLK

Internal Audio Clock(s)

PVDD

DVDD_CORE

DVDD_IO

AVDD

vol

BTL

Digital PWM

controller

vol

DVSS

AVSS

PVSS

Vref

SPKR_EN

TEST

VDD_XTAL

VDD_PLL2

VDD_PLL1

VDD_PLSS

VSS_PLSS

VSS_XTAL

Class D Left-

Class D Right-

VDD_PLL3

ACS32201 Datasheet(PDF) 7 Page - Integrated Device Technology

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