Product details

Audio input type Digital Input Architecture Class-D Boosted, Smart Amp Speaker channels (Max) Mono Power stage supply (Max) (V) 8.5 Power stage supply (Min) (V) 2.7 Load (Min) (ohms) 4 Output power (W) 5.7 SNR (dB) 111 THD + N @ 1 kHz (%) 0.0035 Iq (Typ) (mA) 3.9 Control interface I2C, SPI Closed/open loop Closed Analog supply (Min) (V) 2.9 Analog supply (Max) (V) 5.5 Sampling rate (Max) (kHz) 96 PSRR (dB) 110 Operating temperature range (C) -40 to 85
Audio input type Digital Input Architecture Class-D Boosted, Smart Amp Speaker channels (Max) Mono Power stage supply (Max) (V) 8.5 Power stage supply (Min) (V) 2.7 Load (Min) (ohms) 4 Output power (W) 5.7 SNR (dB) 111 THD + N @ 1 kHz (%) 0.0035 Iq (Typ) (mA) 3.9 Control interface I2C, SPI Closed/open loop Closed Analog supply (Min) (V) 2.9 Analog supply (Max) (V) 5.5 Sampling rate (Max) (kHz) 96 PSRR (dB) 110 Operating temperature range (C) -40 to 85
  • Ultra low-noise mono boosted class-D amplifier
    • 5.7 W at 1% THD+N and 6.9 W at 10% THD+N into 4-Ω load from 4.2-V supply
    • 3.8 W at 1% THD+N and 4.5 W at 10% THD+N into 8-Ω load from 4.2-V supply
  • Output noise for DAC + class-D (ICN) is 15.9 µV
  • DAC + class-D SNR 111 dB at 1%THD+N/8 Ω
  • THD+N –90 dB at 1 W / 8 Ω with flat frequency response
  • Post-filter feedback (PFFB)
  • PSRR 110 dB for 200 mVpp ripple at 217 Hz
  • Input sample rates from 8 kHz to 96 kHz
  • Built-in speaker sense
    • Measures speaker current and voltage
    • Measures VBAT voltage, chip temperature
  • Dedicated real-time dual-core DSP for speaker protection
    • Thermal and excursion protection
    • Detects speaker leaks and damage
  • High efficiency class-H boost converter with multi-level tracking
    • 86% at 500 mW in 8 Ω with 3.6 V VBAT
    • 87% at 700 mW in 8 Ω with 4.2 V VBAT
  • Configurable automatic gain control (AGC)
    • Limits battery current consumption
  • Adjustable class-D switching edge-rate control
  • Thermal, short-circuit, and under-voltage protection
  • I2S, Left-justified, right-justified, DSP, and TDM input and output interface,
  • I2C or SPI interface for register control
  • Stereo configuration using two TAS2557 devices
  • Power supplies
    • Boost input: 2.9 V to 5.5 V
    • Analog/digital: 1.65 V to 1.95 V
    • Digital I/O: 1.62 V to 3.6 V
  • 42-ball, 0.5-mm pitch, DSBGA package
  • Ultra low-noise mono boosted class-D amplifier
    • 5.7 W at 1% THD+N and 6.9 W at 10% THD+N into 4-Ω load from 4.2-V supply
    • 3.8 W at 1% THD+N and 4.5 W at 10% THD+N into 8-Ω load from 4.2-V supply
  • Output noise for DAC + class-D (ICN) is 15.9 µV
  • DAC + class-D SNR 111 dB at 1%THD+N/8 Ω
  • THD+N –90 dB at 1 W / 8 Ω with flat frequency response
  • Post-filter feedback (PFFB)
  • PSRR 110 dB for 200 mVpp ripple at 217 Hz
  • Input sample rates from 8 kHz to 96 kHz
  • Built-in speaker sense
    • Measures speaker current and voltage
    • Measures VBAT voltage, chip temperature
  • Dedicated real-time dual-core DSP for speaker protection
    • Thermal and excursion protection
    • Detects speaker leaks and damage
  • High efficiency class-H boost converter with multi-level tracking
    • 86% at 500 mW in 8 Ω with 3.6 V VBAT
    • 87% at 700 mW in 8 Ω with 4.2 V VBAT
  • Configurable automatic gain control (AGC)
    • Limits battery current consumption
  • Adjustable class-D switching edge-rate control
  • Thermal, short-circuit, and under-voltage protection
  • I2S, Left-justified, right-justified, DSP, and TDM input and output interface,
  • I2C or SPI interface for register control
  • Stereo configuration using two TAS2557 devices
  • Power supplies
    • Boost input: 2.9 V to 5.5 V
    • Analog/digital: 1.65 V to 1.95 V
    • Digital I/O: 1.62 V to 3.6 V
  • 42-ball, 0.5-mm pitch, DSBGA package

The TAS2557 device is a state-of-the-art Class-D audio amplifier which is a full system on a Chip (SoC). The device features a ultra low-noise audio DAC and Class-D power amplifier which incorporates speaker voltage and current sensing feedback. An on-chip, low-latency DSP supports Texas Instruments SmartAmp speaker protection algorithms to maximizes loudness while maintaining safe speaker conditions.

The device can be used easily with any processor with an I2S output and stereo implementations are possible when using two TAS2557 devices. Separate tuning for different speakers is supported allowing customers to add value while maintaining form factor designs. Additionally, the TAS2557 supports separate voice and audio tuning dynamically with ultra-low 15.9 µV ICN regardless of mode of operation making receiver/speaker implementations possible.

A Class-H boost converter generates the Class-D amplifier supply rail. When the audio signal only requires a lower Class-D output power, the boost improves system efficiency by deactivating and connecting VBAT directly to the Class-D amplifier supply. When higher audio output power is required, the multi-level boost quickly activates tracking the signal to provide the additional voltage to the load.

The TAS2557 device is a state-of-the-art Class-D audio amplifier which is a full system on a Chip (SoC). The device features a ultra low-noise audio DAC and Class-D power amplifier which incorporates speaker voltage and current sensing feedback. An on-chip, low-latency DSP supports Texas Instruments SmartAmp speaker protection algorithms to maximizes loudness while maintaining safe speaker conditions.

The device can be used easily with any processor with an I2S output and stereo implementations are possible when using two TAS2557 devices. Separate tuning for different speakers is supported allowing customers to add value while maintaining form factor designs. Additionally, the TAS2557 supports separate voice and audio tuning dynamically with ultra-low 15.9 µV ICN regardless of mode of operation making receiver/speaker implementations possible.

A Class-H boost converter generates the Class-D amplifier supply rail. When the audio signal only requires a lower Class-D output power, the boost improves system efficiency by deactivating and connecting VBAT directly to the Class-D amplifier supply. When higher audio output power is required, the multi-level boost quickly activates tracking the signal to provide the additional voltage to the load.

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To request access to PurePath™ Console 3 and other design resources: Request TAS2557

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Technical documentation

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Type Title Date
* Data sheet TAS2557 5.7-W Class-D mono audio amplifier with class-H boost and speaker sense datasheet (Rev. B) 28 Feb 2019
Technical article How smart amps are bringing high-fidelity audio into the smart home 03 May 2021
Application note Current and Voltage Sensing Accuracy and Linearity 21 Jul 2020
Application note Limitations of Capacitor only EMI Filters on Class-D Amplifiers 21 Jul 2020
Application note Requesting Access to Audio Software 18 Jun 2020
User guide SmartAmp Learning Board 2 User's Guide (Rev. A) 13 Sep 2019
Application note Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) 26 Aug 2019
Application note Passive Component Selection Guide for Class-D Audio Amplifier 27 Jun 2019
Application note Battery Voltage Tracking Limiter and Brown-Out Protection 26 Jun 2019
Application note PCB Layout Guidelines for TAS2xxx Series Class-D Boosted Audio Amplifier 06 Jun 2019
Application note Benefits of Class-G and Class-H Boost in Audio Amplifiers 30 Apr 2019
Application note PLL and Clocking Configuration for Audio Devices 26 Mar 2019
Application note How the SmartAmp Speaker Protection Algorithm Compensates the Effects of Series 08 Aug 2018
Application note SmartPA Speaker Protection Algorithm 06 Aug 2018
Technical article Smart speakers don’t have to sound as small as they are 04 Jun 2018
Technical article Integrating next-generation linear resonance actuator systems 28 Dec 2017
Technical article Don’t limit your audio: how to achieve loud sound from a small speaker 18 Dec 2017
Application note Post Filter Feedback Class-D Amplifier Benefits and Design Considerations 14 Nov 2017
More literature Calibration and Verification Wave Files 21 Sep 2017
Application note TAS2557 and TAS2559 End System Integration Guide 08 Sep 2017
Application note Smart Amp Tuning Guide 05 Sep 2017
Application note TAS2555, TAS2557, and TAS2559 Factory Test and Calibration Guide 02 Sep 2017
Application note Smart Amp Quick Start Guide 03 Aug 2017
EVM User's guide TAS2557EVM User's Guide 26 Oct 2016
Application note AN-1737 Managing EMI in Class D Audio Applications (Rev. A) 01 May 2013

Design & development

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

Evaluation board

PP-SALB2-EVM — PP-SALB2-EVM Smart amp speaker characterization board evaluation module (Learning Board 2)

This board supports: TAS2555YZEVMTAS2557EVM and TAS2559EVM.

The Smart Amplifier Speaker Characterization Board, when used in conjunction with a supported TI Smart Amplifier and PurePath Console software, provides users the ability to measure speaker excursion, temperature and other parameters for (...)

Not available on TI.com
Evaluation board

TAS2557EVM — TAS2557 5.7-W Class-D Audio Amplifier Evaluation Module with Class-H Boost and Speaker Sense

The TAS2557EVM evaluation module provides users with a powerful tool kit for complete assessment of the TAS2557 audio amplifier when used with PurePath™ Console 3 software suite (PPC3). The evaluation module ships with an attached reference speaker. The board provides an USB connection to (...)

Not available on TI.com
Application software & framework

PUREPATHCONSOLE — PurePath™ Console graphical development suite for audio system design and development

PurePath™ Console is a highly integrated and easy-to-use audio development suite designed specifically to simplify the evaluation, configuration and debug process associated with the development of audio products. Watch how easy it is to use the PurePath™ Console 3 software.
PurePath Console’s (...)
Driver or library

TAS2XXX-DRIVERS — Android and other drivers for the TAS25XX and TAS27XX series of Class-D amplifiers

These Android drivers support TI’s low power digital input Class-D audio amplifier devices. The "Get software" buttons link to git.ti.com repositories for these open-source drivers.
Simulation model

TAS2557 IBIS Model

SLAM294.ZIP (50 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 (...)
Reference designs

TIDA-01589 — High fidelity, near-field two-way audio reference design with noise reduction and echo cancellation

Man machine interaction requires an acoustic interface for providing full duplex hands-free communication. In hands-free mode, part of the far-end or near-end audio signal from the speaker is coupled to the microphones. Furthermore, in noisy environments the microphones also capture ambient noise (...)
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