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TAS2781

ACTIVE

25 W, 4.5-V to 23-V, digital-input integrated-audio-processing speaker-protection class-D amplifier

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Data sheet

TAS2781

ACTIVE
Data sheet Order now

Product details

Audio input type Digital Input Architecture Class-D, Smart Amp Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 23 Power stage supply (min) (V) 4.5 Load (min) (Ω) 3.2 Output power (W) 25 SNR (dB) 110 THD + N at 1 kHz (%) 0.006 Iq (typ) (mA) 15 Control interface I2C, SPI, Shutdown Mode Closed/open loop Closed Analog supply (min) (V) 1.65 Analog supply voltage (max) (V) 1.95 Sampling rate (max) (kHz) 192 PSRR (dB) 110 Operating temperature range (°C) -40 to 85
Audio input type Digital Input Architecture Class-D, Smart Amp Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 23 Power stage supply (min) (V) 4.5 Load (min) (Ω) 3.2 Output power (W) 25 SNR (dB) 110 THD + N at 1 kHz (%) 0.006 Iq (typ) (mA) 15 Control interface I2C, SPI, Shutdown Mode Closed/open loop Closed Analog supply (min) (V) 1.65 Analog supply voltage (max) (V) 1.95 Sampling rate (max) (kHz) 192 PSRR (dB) 110 Operating temperature range (°C) -40 to 85
VQFN-HR (RYY) 30 14 mm² 3.5 x 4
  • Integrated DSP for audio processing
  • 24-V Supply for class-d output stage
  • Y-Bridge multi-level supply architecture
  • Hybrid-pro external boost control algorithm
  • Ultrasonic output support up to 40 kHz
  • 25 W, 1% THD+N (4 Ω, 18 V)
  • 30 W Maximum output power, 10% THD+N
  • 82% at 1W, 4 Ω, PVDDH = 12 V, PVDDL = 3.8 V
  • 83% at 1W, 8 Ω, PVDDH = 18 V, PVDDL = 5 V
  • 84% at 1W, 4 Ω, PVDDH = 18 V, PVDDL = 5 V
  • 90% at 15W, 4 Ω, PVDDH = 18 V, PVDDL = 5 V
  • 93% at 15W , 8 Ω, PVDDH = 18 V, PVDDL = 5 V
  • <0.5 µA in Hardware Shutdown Mode
  • AVDD: 1.8 V
  • IOVDD: 1.8 V/ 3.3 V
  • PVDDL: 2.7 V to 5.5 V
  • PVDDH: 3 V to 24 V
  • SDOUT for echo cancellation
  • I 2S/TDM: 8 channels of 32 bits up to 192 KSPS
  • I 2C with fast mode+ or SPI
  • Inter-chip communication bus
  • 16 kHz to 192 kHz sample rates
  • Real-time IV-sense for speaker protection
  • Dynamic range compressor
  • Brownout protection with power limiter
  • Multi-channel balancing communication
  • Over power and low battery protection
  • PVDDH/ PVDDL supply tracking limiters
  • Thermal and over current protections
  • Thermal foldback
  • Post filter feedback and slew rate control
  • Integrated DSP for audio processing
  • 24-V Supply for class-d output stage
  • Y-Bridge multi-level supply architecture
  • Hybrid-pro external boost control algorithm
  • Ultrasonic output support up to 40 kHz
  • 25 W, 1% THD+N (4 Ω, 18 V)
  • 30 W Maximum output power, 10% THD+N
  • 82% at 1W, 4 Ω, PVDDH = 12 V, PVDDL = 3.8 V
  • 83% at 1W, 8 Ω, PVDDH = 18 V, PVDDL = 5 V
  • 84% at 1W, 4 Ω, PVDDH = 18 V, PVDDL = 5 V
  • 90% at 15W, 4 Ω, PVDDH = 18 V, PVDDL = 5 V
  • 93% at 15W , 8 Ω, PVDDH = 18 V, PVDDL = 5 V
  • <0.5 µA in Hardware Shutdown Mode
  • AVDD: 1.8 V
  • IOVDD: 1.8 V/ 3.3 V
  • PVDDL: 2.7 V to 5.5 V
  • PVDDH: 3 V to 24 V
  • SDOUT for echo cancellation
  • I 2S/TDM: 8 channels of 32 bits up to 192 KSPS
  • I 2C with fast mode+ or SPI
  • Inter-chip communication bus
  • 16 kHz to 192 kHz sample rates
  • Real-time IV-sense for speaker protection
  • Dynamic range compressor
  • Brownout protection with power limiter
  • Multi-channel balancing communication
  • Over power and low battery protection
  • PVDDH/ PVDDL supply tracking limiters
  • Thermal and over current protections
  • Thermal foldback
  • Post filter feedback and slew rate control

The TAS2781 is a mono, digital input Class-D audio amplifier optimized for efficiently driving high peak power into loudspeakers. The Class-D amplifier is capable of delivering 25 W of continuous power into a 4 Ω load with less than 1% THD+N at a supply voltage of 18 V. The broad voltage input range and the high output power makes this amplifier versatile enough to work with battery or line powered systems.

An on-chip DSP supports Texas Instruments Smart Amp speaker protection algorithm. The integrated speaker voltage and current sense provides for real-time monitoring of loudspeakers.

Y-Bridge power architecture improves amplifier efficiency by internally selecting the supplies for optimal headroom. Brownout prevention scheme with adjustable threshold allows reducing the gain in signal path when the supply drops.

The Hybrid-Pro algorithm allows user to optimize efficiency and improve battery life by controlling the external power supply.

Up to eight TAS2781 devices can share a common bus via I 2S/TDM and I 2C/SPI interfaces.

The TAS2781 is available in a 30 pin HR-QFN package for a compact PCB footprint.

The TAS2781 is a mono, digital input Class-D audio amplifier optimized for efficiently driving high peak power into loudspeakers. The Class-D amplifier is capable of delivering 25 W of continuous power into a 4 Ω load with less than 1% THD+N at a supply voltage of 18 V. The broad voltage input range and the high output power makes this amplifier versatile enough to work with battery or line powered systems.

An on-chip DSP supports Texas Instruments Smart Amp speaker protection algorithm. The integrated speaker voltage and current sense provides for real-time monitoring of loudspeakers.

Y-Bridge power architecture improves amplifier efficiency by internally selecting the supplies for optimal headroom. Brownout prevention scheme with adjustable threshold allows reducing the gain in signal path when the supply drops.

The Hybrid-Pro algorithm allows user to optimize efficiency and improve battery life by controlling the external power supply.

Up to eight TAS2781 devices can share a common bus via I 2S/TDM and I 2C/SPI interfaces.

The TAS2781 is available in a 30 pin HR-QFN package for a compact PCB footprint.
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Technical documentation

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Type Title Date
* Data sheet TAS2781 24-V Class-D Amplifier with Real Time Integrated Speaker Protection and Audio Processing datasheet (Rev. B) PDF | HTML 26 Jan 2023
Application note TAS27xx Introduction to Click and Pop Noise Measurement in Class-D Audio Amplifiers PDF | HTML 26 Mar 2024
Application note TAS2781 and TAS2783 Hybrid-Pro Boost Controller PDF | HTML 08 Oct 2022
Application note TAS2781, TAS2783 Audio Enhancement PDF | HTML 05 Jul 2022
User guide TAS2781EVM User's Guide PDF | HTML 28 Jun 2022
Application note Y-Bridge in Class-D Amplifiers for Improving Efficiency PDF | HTML 19 Nov 2021
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

Design & development

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

Evaluation board

TAS2781EVM — TAS2781 evaluation module for mono Class-D audio amplifier with digital input and speaker IV sense

TAS2781EVM is designed to be used as stand-alone evaluation module, and provides the user with the tools to integrate TI's smart amplifier TAS2781 into the end system. This EVM provides mono speaker output using the TAS2781 Smart Amp. The user can control and configure the TAS2781EVM using the (...)
User guide: PDF | HTML
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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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Application software & framework

TAS2781-LINUX — TAS2781 Linux Driver and Factory Calibration tool

TAS2781 Linux Driver supports configuring registers through binary file, Factory Calibration tool is used to calibrate the impedance of the speaker in manufacturing and keep consistent loudness from system to system.
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Speaker amps
TAS2781 — 25 W, 4.5-V to 23-V, digital-input integrated-audio-processing speaker-protection class-D amplifier
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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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VQFN-HR (RYY) 30 View options
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