1 Features

Key Features

• Integrated DSP for Audio Processing

• 23-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

Output Power:

• 25 W, 1 THD+N (4 Ω, 18 V)

• 30 W Maximum Output Power, 10 THD+N

Efficiency (1 THDN) and Power Consumption

• 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

Power Supplies and Management:

• AVDD: 1.8 V

• IOVDD: 1.8 V/ 3.3 V

• PVDDL: 2.7 V to 5.5 V

• PVDDH: 4.5 V to 23 V

Interfaces and Control:

• SDOUT for Echo Cancellation

• I2S/TDM: 8 Channels of 32 bits up to 192 KSPS

• I2C with Fast Mode+ or SPI Interface

• Inter-Chip Communication Bus

• 16 kHz to 192 kHz Sample Rates

Advanced DSP Audio Processing:

• Real-time IV-Sense for Speaker Protection

• Dynamic Range Compressor

• Brownout Protection with Power Limiter

• Multi-Channel Balancing Communication

Protection and EMI:

• Over Power and Low Battery Protection

• PVDDH/ PVDDL Suply Tracking Limiters

• Thermal and Over Current Protections

• Thermal Foldback

• Post Filter Feedback and Slew Rate Control

2 Applications

• Laptop and Desktop Computers

• Smart Speakers

• Tablets and Handhelds

• Wireless Speakers

3 Description

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 realtime

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 I2S/TDM and I2C/SPI interfaces.

The TAS2781 is available in a 30 pin HR-QFN

package for a compact PCB footprint.