5.7W Digital Input Smart Amp with Integrated Speaker Protection, Advanced EQ and 8.5V Class-H Boost


Product details


Audio input type Digital Input Architecture Class-D Boosted, Smart Amp Speaker channels (Max) Mono Power stage supply (Max) (V) 5.5 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 open-in-new Find other Speaker amps


  • 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

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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

Technical documentation

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

Design & development

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

Hardware development

document-generic User guide

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 (...)

  • Easily and quickly characterize speakers
  • Quick connection to TI Smart Amplifier EVMs
  • Microphone included for SPL measurements
  • Laser input for speaker excursion measurements
document-generic User guide

To get started:

Step 1: Hardware
Order TAS2557EVM evaluation board & PP-SALB2-EVM learning board

Step 2: Software
Request PurePath Console 3 (PPC3) control GUI, be sure to indicate you are working with the TAS2557EVM

Step 3: Training
Review training video for speaker characterization and Smart amp tuning (...)

  • TAS2557 5.7W Class-D Audio Amplifier with Class-H Boost and IV Sense
  • Reference speaker
  • SPI or I2C control interface
  • Onboard USB interface and cable for connection to PC with a Microsoft Windows 7+ operating system
  • Access to TAS2555 app for PurePath Console 3

Software development

PurePath™ Console graphical development suite for audio system design and development
PUREPATHCONSOLE 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 (...)

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

Design tools & simulation

SLAM294.ZIP (50 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

High fidelity, near-field two-way audio reference design with noise reduction and echo cancellation
TIDA-01589 — 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 in (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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Ordering & quality

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