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STA333ML：Sound Terminal 2-channel microless high-efficiency digital audio system

The STA333ML is a single die embedding digital audio processing and high-efficiency power amplification, capable of operating without the aid of an external microcontroller.

The STA333ML is part of the Sound Terminal^®family that provides full digital audio streaming to the speakers and offers cost effectiveness, low power dissipation and sound enrichment.

The STA333ML combines a unique 24-bit DDX^®digital class-D ternary modulator together with an extremely low R_dsONstereo power DMOS stage. The latter is capable of a total output power of 2 x 20 W with outstanding performance in terms of efficiency (>90%), THD, SNR and EMI.

The microless feature allows its use in low-cost applications (cradles, digital speakers, audio terminals) where no microcontroller is needed.

The serial audio data interface accepts the universally used I²S format. Basic features, such as the oversampling clock, gain, and I²S format, can be set using a minimal number of selection pins.

The STA333ML is self-protected against thermal overload, overcurrent, short-circuit and overvoltage conditions.

The fault condition is also signalled on an external pin (INT_LINE) for specific requirements.

Key Features

• Wide supply voltage range (4.5 - 20 V)
• 2 x 20 W into 8 Ω at VCC = 18 V
• PowerSSO-36 exposed pad package
• 2 channels of 24-bit DDX®
• 100-dB SNR and dynamic range
• Selectable 32 kHz to 48 kHz input sample rates
• Automatic zero-detect mute
• Automatic invalid input detect mute
• 2-channel I2 S input data interface
• Selectable clock input ratio (256 or 364 * fs)
• Max power correction for lower full power
• 96 kHz internal processing sample rate, 24-bit precision
• Embedded thermal overload and short-circuit protection
• Filterless configuration option
• Applications
  • LCDs
  • DVDs
  • Cradles
  • Digital speakers
  • Wireless speaker cradles

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