SLAS687A – FEBRUARY 2013 – REVISED FEBRUARY 2013
Digital Input Class-D Speaker Amplifier with Embedded miniDSP and mono headphone
amplifier
Check for Samples:
1 INTRODUCTION
1.1
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Features
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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
I
2
S, Left-Justified, Right-Justified, DSP, and
TDM Audio Interfaces
I
2
C and SPI control with auto-increment
Full Power-Down Control
Power Supplies:
– Analog: 1.5 V–1.95 V
– Digital Core: 1.65 V–1.95 V
– 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
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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 (I
2
S,
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
I
2
C™ 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.
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to
specifications per the terms of the Texas Instruments standard warranty. Production
processing does not necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated
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