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.