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STA323W：2.1-channel high-efficiency digital audio system

The STA323W is a single-chip audio system comprising digital audio processing, digital amplifier control and a DDX^®power-output stage. The STA323W uses all-digital amplification to provide high-power, high-quality and high-efficiency.

The STA323W power section consists of four independent half-bridges. These can be configured, by digital control, to operate in the following modes.

Two channels, provided by two half-bridges, and a single full-bridge giving up to 2 x 10 W + 1 x 20 W of power output.

Two channels, provided by two full-bridges, giving up to 2 x 20 W of power.

A single, parallel, full-bridge channel capable of high-current operation and giving 1 x 40W output.

The STA323W also provides a full set of digital processing features. This includes up to four programmable 28-bit biquads (EQ) per channel, and bass and treble tone control. AutoModes™ enable a time-to-market advantage by substantially reducing the amount of software development needed for specific functions. These includes auto volume loudness, preset volume curves and preset EQ settings. New advanced AM radio-interference reduction modes are also provided.

The serial audio data input interface accepts all existing formats, including the I²S.

Three channels of DDX^®processing are provided. This high-quality conversion from PCM audio to DDX patented 3-state PWM switching provides over 100 dB of SNR and dynamic range.

Key Features

• Wide supply voltage range (10 V - 36 V)
• Three power output configurations
  • 2 x 10 W + 1 x 20 W
  • 2 x 20 W
  • 1 x 40 W
• Thermal protection
• Under-voltage protection
• Short-circuit protection
• PowerSO-36 slug down package
• 2.1 channels of 24-bit DDX®
• 100-dB SNR and dynamic range
• 32 kHz to 192 kHz input sample rates
• Digital gain/attenuation +48 dB to -80 dB in 0.5-dB steps
• Four 28-bit user programmable biquads (EQ) per channel
• I²C control
• 2-channel I²S input data interface
• Individual channel and master gain/attenuation
• Individual channel and master soft and hard mute
• Individual channel volume and EQ bypass
• DDX® POP free operation
• Bass/treble tone control
• Dual independent programmable limiters/compressors
• AutoModes™ settings for:
  • 32 preset EQ curves
  • 15 preset crossover settings
  • Auto volume controlled loudness
  • 3 preset volume curves
  • 2 preset anti-clipping modes
  • Preset night-time listening mode
  • Preset TV AGC
• Input and output channel mapping
• AM noise-reduction and PWM frequency shifting modes
• Soft volume update and muting
• Auto zero detect and invalid input detect muting selectable DDX® ternary or binary PWM output plus variable PWM speeds
• Selectable de-emphasis
• Post-EQ user programmable mix with default 2.1 bass-management settings
• Variable max power correction for lower full-power THD
• Four output routing configurations
• Selectable clock input ratio
• 96 kHz internal processing sample rate, 24 to 28-bit precision
• Video application supports 576 * fs input mode

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