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Texas Instruments TAS6424R-Q1 Digital-Input Class-D Audio Amplifier

Texas Instruments TAS6424R-Q1 Digital-Input Class-D Audio Amplifier implements a 2.1MHz PWM switching frequency, enabling a cost-optimized device in a tiny PCB size. The device also has full operation down to 4.5V for start/stop events and exceptional sound quality with up to 40kHz audio bandwidth. The output switching frequency can be set above or below the AM band. Above the AM band eliminates AM-band interferences and reduces output filtering and cost. Below the AM band can help optimize efficiency.

The device has a built-in load diagnostic function for detecting and diagnosing misconnected outputs. This function can detect AC-coupled tweeters to help reduce test time during manufacturing. The devices add EMI management features, including spread-spectrum, output phase offset, and optimized slew rate to assist in system-level EMI challenges. The Texas Instruments TAS6424R-Q1 Class-D audio amplifier is designed for use in automotive head units and external amplifier modules.

Features

AEC-Q100 qualified for automotive applications
- Temperature grade 1 (-40°C to +125°C T_A)
Advanced load diagnostics
- DC diagnostics run without input clocks
- AC diagnostic for tweeter detection with impedance and phase response
Easily meets CISPR25-L5 EMC specifications
Audio inputs
- Four-channel I²S or 4/8-channel TDM input
- Input sample rates of 44.1kHz, 48kHz, and 96kHz
- Input formats of 16-bit to 32-bit I²S and TDM
- Support for high-resolution audio systems
Audio outputs
- Four-channel bridge-tied load (BTL)
- Two-channel parallel BTL (PBTL)
- Up to 2.1MHz output switching frequency
- 45W, 10% THD into 2Ω at 14.4V BTL
- 75W, 10% THD into 4Ω at 25V BTL
- 150W, 10% THD into 2Ω at 25V PBTL
Audio performance into 4Ω at 14.4V BTL
- THD+N <0.009% at 1W
- 30µV_RMS output noise
- –97dB crosstalk

Load diagnostics
- Open load, shorted load, short-to-battery, short-to-ground
- Line output detection up to 6kΩ
Protection
- Enhanced reverse current capabilities
- Output current limiting and short protection
- 40V Load dump
- Open ground and power-tolerant
- DC offset
- Over-temperature, undervoltage, and overvoltage
General operation
- 4.5V to 26.4V supply voltage
- I²C control with four address options
- Latched and non-latched clip detect
- Enhanced EMI management

Applications

Automotive head unit
Automotive external amplifier

Texas Instruments TAS6424R-Q1 Digital-Input Class-D Audio Amplifier

Features

Applications

Functional Block Diagram

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