TAS3004

具有编解码器的数字音频处理器

The device is a system-on-a-chip that replaces conventional analog equalization to perform digital parametric equalization, dynamic range compression, and loudness contour. Additionally, this device provides high-quality, soft digital volume, bass, and treble control. All control parameters are uploaded through the I2C port from an outside MCU through the I2C slave port or from an external EPROM through the I2C master port.

The TAS3004 device also has an integrated 24-bit stereo codec with two I2 C-selectable, single-ended inputs per channel.

The digital parametric equalization consists of seven cascaded, independent biquad filters per channel. Each biquad filter has five 24-bit coefficients that can be configured into many different filter functions such as bandpass, high pass, and low pass.

The internal loudness contour algorithm can be controlled and programmed with an I2C command.

Dynamic range compression/expansion DRCE is programmable through the I2C port. The system designer can set the threshold, energy estimation time constant, compression ratio, and attack and decay time constants.

The TAS3004 device supports 13 serial interface formats I2S, left justified, right justified with data word lengths of 16, 18, 20, or 24 bits. The sampling frequency fS may be set to 32 kHz, 44.1 kHz, or 48 kHz.

The TAS3004 device uses a system clock generated by the internal phase-locked loop PLL. The reference clock for the PLL is provided by an external master clock MCLK of 256fS or 512fS, or a 256fS crystal.

The TAS3004 device has six internally configurable general-purpose input GPI terminals that control volume, bass, treble, and equalization. Each GPI terminal has a debounce algorithm that is programmed into the TAS3004 internal microcontroller.

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Programmable seven-band parametric equalization

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Programmable digital volume control

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Programmable digital bass and treble control

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Programmable dynamic range compression/expansion DRCE

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Programmable loudness contour/dynamic bass control

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Configurable serial port for audio data

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Two input data channels that can be mixed with digital data from the analog-to-digital converter ADC of the codec analog input. These channels are controlled by I2C commands.

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Three output data channels: Left and right data go through equalization; bass, treble, DRCE, and volume to SDOUT1; SDOUT2 mixes left and right data. SDOUT2 operates as a center channel or subwoofer channel. The output of the ADC is available for additional processing.

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Capability to configure ADC output to one of two monaural data streams or one stereo data stream

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Capability to digitally mix left and right input channels for a monaural output to facilitate subwoofer operation

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Serial I2 C master/slave port that allows:

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Downloading of control data to the device externally from the EPROM or an I2C master

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Controlling other I2C devices

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Two I2C-selectable, single-ended analog input stereo channels

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Equalization bypass mode

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Single 3.3-V power supply

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Powerdown without reloading the coefficients

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Sampling rates: 32 kHz, 44.1 kHz, or 48 kHz

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Master clock frequency, 256fS or 512fS

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Can have crystal input to replace MCLK. Crystal input frequency is 256fS.

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Six GPI terminals for volume, bass, treble up/down control, mute, and selection of equalization filters