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TAS2555

ACTIVE

5.7-W, digital input smart amp with integrated speaker protection, advanced EQ & 8.5-V Class-H boost

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Data sheet

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TAS2557 ACTIVE 5.7-W, digital input smart amp with integrated speaker protection, advanced EQ & 8.5-V Class-H boost TAS2557 features the Post-Filter Feedback (PFFB)

TAS2555

ACTIVE
Data sheet Order now

Product details

Audio input type Digital Input Architecture Class-D Boosted, Smart Amp Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 8.5 Power stage supply (min) (V) 2.7 Load (min) (Ω) 4 Output power (W) 5.7 SNR (dB) 111 THD + N at 1 kHz (%) 0.02 Iq (typ) (mA) 3 Control interface I2C, SPI Closed/open loop Closed Analog supply (min) (V) 2.95 Analog supply voltage (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 Rating Catalog Power stage supply (max) (V) 8.5 Power stage supply (min) (V) 2.7 Load (min) (Ω) 4 Output power (W) 5.7 SNR (dB) 111 THD + N at 1 kHz (%) 0.02 Iq (typ) (mA) 3 Control interface I2C, SPI Closed/open loop Closed Analog supply (min) (V) 2.95 Analog supply voltage (max) (V) 5.5 Sampling rate (max) (kHz) 96 PSRR (dB) 110 Operating temperature range (°C) -40 to 85
DSBGA (YZ) 42 See data sheet
  • 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 – dB at 1 W / 8 Ω with flat frequency response
  • PSRR 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 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 TAS2555 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 – dB at 1 W / 8 Ω with flat frequency response
  • PSRR 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 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 TAS2555 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 TAS2555 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 TAS2555 devices. Separate tuning for different speakers is supported allowing customers to add value while maintaining form factor designs. Additionally, the TAS2555 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 TAS2555 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 TAS2555 devices. Separate tuning for different speakers is supported allowing customers to add value while maintaining form factor designs. Additionally, the TAS2555 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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Technical documentation

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Type Title Date
* Data sheet TAS2555 5.7-W Class-D mono audio amplifier with class-H boost and speaker sense datasheet (Rev. B) PDF | HTML 28 Feb 2019
Technical article How smart amps are bringing high-fidelity audio into the smart home PDF | HTML 03 May 2021
Application note Current and Voltage Sensing Accuracy and Linearity PDF | HTML 21 Jul 2020
Application note Limitations of Capacitor only EMI Filters on Class-D Amplifiers PDF | HTML 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 PDF | HTML 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 PDF | HTML 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 Don’t limit your audio: how to achieve loud sound from a small speaker PDF | HTML 18 Dec 2017
More literature Calibration and Verification Wave Files 21 Sep 2017
Application note TAS2555 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
Technical article Audio loudness and quality evaluations for smart amplifier solutions PDF | HTML 22 Jan 2016
Technical article PurePath Console 3 gets fine-tuned! PDF | HTML 11 Nov 2015
EVM User's guide TAS2555 EVM User's Guide 18 Sep 2015
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: TAS2555YZEVM, TAS2557EVM 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 (...)

User guide: PDF
Not available on TI.com
Evaluation board

TAS2555YZEVM — TAS2555 5.7W Class-D Audio Amplifier Evaluation Module

The TAS2555YZEVM evaluation module provides users with an small reference board for complete evaluation of the TAS2555 Audio Amplifier. Shipped complete with a reference speaker, users can quickly hear the audio quality of the TAS2555 solution or start developing on their own speaker/application. (...)

User guide: PDF
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 (...)
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Driver or library

SLAC723 — TAS2555SW-Android

Supported products & hardware

Supported products & hardware

Products
Speaker amps
TAS2555 — 5.7-W, digital input smart amp with integrated speaker protection, advanced EQ & 8.5-V Class-H boost
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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.
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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 (...)
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DSBGA (YZ) 42 View options
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