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STA328 Datasheet(PDF) 5 Page - STMicroelectronics |
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STA328 Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 57 page  STA328 Description 5/57 1 Description 1.1 Overview The STA328 comprises digital audio processing, digital amplifier control and DDX® power output stage to create a high-power single-chip DDX® solution for high-quality, high-efficiency, all digital amplification. The STA328 power section consists of four independent half-bridges. These can be configured via digital control to operate in different modes. 2.1 channels can be provided by two half-bridges and a single full-bridge to give up to 2 x 40 W plus 1 x 80 W of power output. Two channels can be provided by two full-bridges to give up to 2 x 80 W of power. The IC can also be configured as a single parallel full-bridge capable of high-current operation and 1 x 160 W output. Also provided in the STA328 is a full assortment of digital processing features. This includes up to four programmable 28-bit biquads (EQ) per channel and bass/treble tone control. AutoModes enable a time-to-market advantage by substantially reducing the amount of software development needed for certain functions. This includes auto volume loudness, preset volume curves, preset EQ settings. New advanced AM radio-interference reduction modes. The serial audio data input interface accepts all possible formats, including the popular I2S format. Three channels of DDX® processing are provided. This high-quality conversion from PCM audio to patented DDX® 3-state PWM switching provides over 100 dB of SNR and dynamic range. Figure 1. Block diagram Figure 2. Channel signal flow diagram through the digital core Serial Data Input, Channel Mapping & Resampling DDX ® Processing Quad Half-Bridge Power Stage OUT1A OUT1B OUT2A OUT2B LRCKI SDI_12 SDA SCL PLL CLK EAPD BICKI FAULT TWARN Power-Down I 2C System Contro l Audio EQ, Mix, Crossver, Volume, Limiter Processing System Timing DDX-SPIRIT Serial Data Input, Channel Mapping & Resampling DDX ® Processing Quad Half-Bridge Power Stage OUT1A OUT1B OUT2A OUT2B LRCKI SDI_12 SDA SCL PLL CLK EAPD BICKI FAULT TWARN Power-Down I 2C System Contro l Audio EQ, Mix, Crossver, Volume, Limiter Processing System Timing DDX-SPIRIT Channel Mapping Re-sampling EQ Processing Mix Volume Limiter 4X Interp DDX® I2S Input DDX Output Crossover Filter |
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