TAS2521 Digital Input Class-D Speaker Amplifier with Embedded miniDSP and mono headphone amplifier | TI.com

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Digital Input Class-D Speaker Amplifier with Embedded miniDSP and mono headphone amplifier



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.


  • 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)


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Part number Order Audio input type Architecture Speaker channels (Max) Power stage supply (Min) (V) Power stage supply (Max) (V) Output power (W) Load (Min) (ohms) SNR (dB) THD + N @ 1 kHz (%) Iq (Typ) (mA) Control interface Closed/open loop Analog supply (Min) (V) Analog supply (Max) (V) Sampling rate (Max) (kHz) PSRR (dB) Operating temperature range (C) Rating
TAS2521 Order now Analog Input
Digital Input    
Class-D     Mono     1.5     1.95     2     4     94     0.012     0.002     I2C
Open     1.5     1.95     192     47.2     -40 to 85     Catalog    
LM48100Q-Q1 Order now Analog Input     Class-AB     Mono     3     5.5     2.4     8     104     0.04     4.4     I2C     Closed     3     5.5       74     -40 to 105     Automotive    
TAS2505-Q1 Order now Analog Input
Digital Input    
Class-D     Mono     2.7     5.5     2.6     4     94     0.02     0.002     I2C
Closed     1.5     1.95     96     47.2     -40 to 105     Automotive    
TPA2005D1-Q1 Order now Analog Input     Class-D     Mono     4.4     5.5     1.18     8     97     0.2     2.8     Hardware     Open     4.5     5.5       75     -40 to 105
-40 to 85