Texas Instruments TAS6754-Q1 Class-D Audio Amplifier
Texas Instruments TAS6754-Q1 Class-D Audio Amplifier is a four-channel digital-input Class-D audio amplifier that implements 1L Modulation, only requiring one inductor per BTL channel. This feature reduces system size and cost by removing four inductors compared to a traditional design. Additionally, 1L Modulation lowers switching losses compared to traditional Class-D modulation schemes.
The TAS6754-Q1 integrates AC and DC load diagnostics to determine the status of the connected loads. This status can be monitored during audio playback through output current sense, which is available for each channel. The measurement can be reported through TDM to a host processor with minimal delay. The device monitors the output load condition while playing audio through real-time load diagnostics independent of the host and audio input.
The Texas Instruments TAS6754-Q1 device features an additional low-latency signal path for each channel, providing up to 70% faster signal processing at 48kHz, which enables time-sensitive Road Noise Cancellation (RNC) and Active Noise Cancellation (ANC) applications. The device supports global temperature, channel temperature, and PVDD values via I2C readout for easy system-level thermal management. The device is offered in a 56-pin HSSOP package with the exposed thermal pad up.
Features
- AEC-Q100 qualified for automotive applications with a temperature grade 1 of –40°C to +125°C, TA
- General operation
- 4.5V to 19V supply voltage, 40V load dump
- Low latency path reducing group delay by >70% at 48kHz
- Support for 1.8V and 3.3V I/O’s
- I2C control with eight address options
- 1L Modulation
- Requires only one inductor per channel, saving four inductors vs a traditional design
- Lower system component cost for inductors
- Smaller PCB footprint
- Audio Performance
- THD+N 0.03% (4Ω, 1W, 1kHz)
- Output noise: 35µVRMS at 14.4V, A-weighting
- Efficiency > 87% @ 4×25W, 4Ω, 14.4V
- Output current sensing by channel via I2S or TDM with no external circuitry required
- Real-time load diagnostics
- Monitor output conditions while playing audio
- Open load and shorted load detection
- DC and AC standby load diagnostics
- Audio inputs
- 2-4 channels via I2S or 4-16 channels via TDM
- Input sample rates: 44.1, 48, 96, 192kHz
- Audio outputs
- 4-channel bridge-tied load (BTL)
- 2MHz output switching frequency
- 4×30W (4Ω, 14.4V, 1kHz, 10% THD+N)
- 4×50W (2Ω, 14.4V, 1kHz, 10% THD+N)
- Advanced spread-spectrum and selectable phase offset
- Protection and monitoring
- Cycle-by-cycle current limiting
- Output short protection
- Clip detection with configurable thresholds
- Thermal foldback and PVDD foldback
- I2C temperature and supply voltage readout
- Configurable overtemperature warning and individual channel shutdown
- DC offset, undervoltage, and overvoltage
Applications
- Automotive head unit
- Automotive external amplifier
- Acoustic vehicle alerting system (AVAS)
Videos
Functional Block Diagram
