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.