Product details

Audio input type Analog Input Architecture Class-D Speaker channels (Max) Mono Power stage supply (Max) (V) 1.95 Power stage supply (Min) (V) 1.5 Load (Min) (ohms) 4 Output power (W) 2 SNR (dB) 94 THD + N @ 1 kHz (%) 0.012 Iq (Typ) (mA) 0.002 Control interface I2C, SPI Closed/open loop Open Analog supply (Min) (V) 1.5 Analog supply (Max) (V) 1.95 Sampling rate (Max) (kHz) 192 PSRR (dB) 47.2 Operating temperature range (C) -40 to 85
Audio input type Analog Input Architecture Class-D Speaker channels (Max) Mono Power stage supply (Max) (V) 1.95 Power stage supply (Min) (V) 1.5 Load (Min) (ohms) 4 Output power (W) 2 SNR (dB) 94 THD + N @ 1 kHz (%) 0.012 Iq (Typ) (mA) 0.002 Control interface I2C, SPI Closed/open loop Open Analog supply (Min) (V) 1.5 Analog supply (Max) (V) 1.95 Sampling rate (Max) (kHz) 192 PSRR (dB) 47.2 Operating temperature range (C) -40 to 85
VQFN (RGE) 24 16 mm² 4 x 4
  • 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 Ωp)
  • 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:
    • 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)
  • 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 Ωp)
  • 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:
    • 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)

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.

This data manual is designed using PDF document-viewing features that allow quick access to information. For example, performing a global search on "page 0 / register 27" produces all references to this page and register in a list. This makes is easy to traverse the list and find all information related to a page and register. Note that the search string must be of the indicated format. Also, this document includes document hyperlinks to allow the user to quickly find a document reference. To come back to the original page, click the green left arrow near the PDF page number at the bottom of the file. The hot-key for this function is alt-left arrow on the keyboard. Another way to find information quickly is to use the PDF bookmarks.

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.

This data manual is designed using PDF document-viewing features that allow quick access to information. For example, performing a global search on "page 0 / register 27" produces all references to this page and register in a list. This makes is easy to traverse the list and find all information related to a page and register. Note that the search string must be of the indicated format. Also, this document includes document hyperlinks to allow the user to quickly find a document reference. To come back to the original page, click the green left arrow near the PDF page number at the bottom of the file. The hot-key for this function is alt-left arrow on the keyboard. Another way to find information quickly is to use the PDF bookmarks.

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Technical documentation

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Type Title Date
* Data sheet Digital Input Class-D Speaker Amplifier with Embedded miniDSP and Mono Headphone datasheet (Rev. A) 24 Feb 2013
Application note Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) 26 Aug 2019
Application note AN-1849 An Audio Amplifier Power Supply Design (Rev. C) 27 Jun 2019
User guide TAS25xx Codec Control EVM (Rev. A) 31 Oct 2017
Application note AN-1737 Managing EMI in Class D Audio Applications (Rev. A) 01 May 2013
User guide TAS2521 Application Reference Guide 14 Feb 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TAS2521EVM — TAS2521 Evaluation Module

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 up to 4-Ω, the device also features a mono headphone driver and a fully programmable miniDSP for signal processing. The digital audio data format is (...)

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GUI for evaluation module (EVM)

TAS25xx Codec Control EVM GUI

SLAC772.ZIP (3110 KB)
Simulation model

TAS2521 IBIS Model

SLAM180.ZIP (125 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Calculation tool

COEFFICIENT-CALC — Coefficient Calculator For Digital Biquad Filters

COEFFICIENT-CALC (TIBQ) calculates the coefficients for the digital filter biquad transfer function implemented in TI audio codecs. The characteristics of the digital filter are adjusted by selecting a filter type and moving a control point within a window that shows the transfer function gain and (...)
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VQFN (RGE) 24 View options

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