1.1 Features

1

. Digital Input Mono Speaker Amp

. Instruction-Programmable Embedded miniDSP

. Supports 8-kHz to 192-kHz Sample Rates

. Mono Class-D BTL Speaker Driver (2 W Into

4 Ω or 1.7 W Into 8 Ω)

. Mono Headphone Driver

. Two Single-Ended Inputs With Output Mixing

and Level Control

. Embedded Power-on-Reset

. Integrated LDO

. Built-in Digital Audio Processing Blocks With

User-Programmable Biquad Filters

. Integrated PLL Used for Programmable Digital

Audio Processor

. I2S, Left-Justified, Right-Justified, DSP, and

TDM Audio Interfaces

. I2C and SPI control with auto-increment

. Full Power-Down Control

. Power Supplies: multi.

Analog: 1.5 V.1.95 V

. Digital Core: 1.65 V.1.95 V high.

Digital I/O: 1.1 V.3.6 V

. Class-D: 2.7 V.5.5 V (SPKVDD ≥ AVDD)

. 24-Pin QFN Package (4mm × 4mm)

1.2 Applications

. Portable Audio Devices

. White goods

. Portable Navigation Devices

1.3 Description

The TAS2521 is a low power digital input speaker

amp with support for 24-bit digital I2S data mono

playback.

In addition to driving a speaker amp upto 4-Ω, the

device also features a mono headphone driver and a

fully programmable miniDSP for signal processing.

The digital audio data format is programmable to

work with popular audio standard protocols (I2S,

left/right-justified) in master, slave, DSP and TDM

modes. The fully programmable miniDSP can support

several functions such equalization for audio, multi.

band DRC, tone generation and several other user

defined functions. An on-chip PLL provides the high.

speed clock needed by the digital signal-processing

block. The volume level can be controlled by register

control. The audio functions are controlled using the

I2C™ serial bus or SPI bus. The device includes an

on-board LDO that runs off the speaker power supply

to handle all internal device analog and digital power

needs. The included POR as power-on-resetcircuit

reliably resets the device into its default state so no

external reset is required at normal usage; however,

the device does have a reset pin for more complex

system initialization needs. The device also includes

two analog inputs for mixing and muxing in both

speaker and headphone analog paths.