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STA529：2 x 100 mW class-D amplifer with analog or digital input, 2.0 multichannel digital audio processor with FFX

The STA529 is a digital stereo class-D audio amplifier. It includes an audio DSP, an ST proprietary high-efficiency class-D driver and CMOS power output stage. It is intended for high-efficiency digital-to-power-audio conversion for portable applications. The STA529 also provides output capabilities for FFX^™. In conjunction with a power device, the STA529 provides high-quality digital amplification.

The STA529 contains an on-chip volume/gain control.

The PWM amplifier achieves greater than 90% efficiency for longer battery life for portable systems.

The innovative class-D modulation, allows the STA529 to work without external LC filters and without a heatsink.

The STA529 I2CDIS pin disables the audio DSP functions and the I²C interface provides a direct conversion of the input signal into output power. This conversion is done without the microcontroller.

The STA529 is designed for low-power operation with extremely low-current consumption in standby mode. It is available in packages TFBGA48 and VFQFPN52. These are very thin packages (1.2 mm thick) ideal for small portable applications.

Key Features

• Up to 96 dB dynamic range
• Sample rates from 8 kHz to 192 kHz
• FFX™ class-D driver
• 1.55 V to 1.95 V digital power supply
• 1.80 V to 3.60 V analog and I/O power supply
• 18-bit audio processing and class-D FFX™ modulator
• >90-dB SNR analog-to-digital converter
• Digital volume control:
  • +36 dB to -105 dB in 0.5-dB steps
  • Software volume update
• 16-bit ADC
• Individual channel and master gain/attenuation
• Automatic invalid input detect mute
• 2-channel I2 S input/output data interface
• Digitally controlled pop-free operation
• 90% efficiency
• Output power for stereo headphones or stereo speakers applications (at THD = 10% and VCC = 3.3 V):
  • 45 mW with 32-Ω headphones
  • 85 mW with 16-Ω headphones
  • 720 mW with 8-Ω speakers
  • 1.1 W with 4-Ω speakers

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