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TAS3202PAGR Datasheet(PDF) 4 Page - Texas Instruments |
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TAS3202PAGR Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 66 page  TAS3202 SLES208B – JUNE 2009 – REVISED MARCH 2011 www.ti.com 2 Functional Description 2.1 Analog Input/Mux/Stereo ADC These modules allow two differential analog stereo inputs to be sent to one ADC to be converted to digital data. The input multiplexers include a preamplifier. This amplifier is driving the ADC, and it is digitally controlled with changes synchronized with the sample clock of the ADC. Minimal crosstalk between selected channels and unselected channels is maintained. When inputs are not needed, they are configured for minimal noise. Also included in this module is one fully differential oversampled stereo ADC. The ADC is a sigma-delta modulator with 256 times oversampling ratio. Because of the oversampling nature of the audio ADC and integrated digital decimation filter, requirements for analog anti-aliasing filtering are relaxed. Filter performance for the ADC is specified under physical characteristics. 2.2 Stereo DAC This module includes one stereo audio DAC, which consists of a digital interpolation filter, digital sigma-delta modulator, and an analog reconstruction filter. The DAC can operate at a maximum of 48 kHz. The DAC upsamples the incoming data by 128 and performs interpolation filtering and processing on this data before conversion to a stereo analog output signal. The sigma-delta modulator always operates at a rate of 128Fs, which ensures that quantization noise generated within the modulator stays low within the frequency band below Fs/2.4 at all sample rates. The digital interpolation filters for interpolation from Fs to 8Fs are included in the audio DSP upper memory (reserved for analog processing), while interpolation from 8Fs to 128Fs is done in a dedicated hardware sample and hold filter. The TAS3202 includes one stereo line driver output. The line driver is capable of driving up to a 10-k Ω load. The stereo output can be in power-down mode when not used. Popless operation is achieved by conforming to start and stop sequences in the device controller code. 2.3 Analog Reference System This module provides all internal references needed by the analog modules. It also provides bias currents for all analog blocks. External decoupling capacitors are needed along with an external 1%-tolerance resistor to set the internal bias currents. It includes a band-gap reference and several voltage buffers and a tracking current reference. The TAS3202 also uses an internally generated mid-rail supply that is used to rereference all analog inputs and is present on all analog outputs. VMID is the analog mid-rail supply and can be used when buffered externally to rereference the analog inputs and outputs. The voltage reference REXT requires a 22-k Ω 1% resistor to ground. The reference system can be powered down separately. 2.4 Power Supply The power supply contains supply regulators that provide analog and digital regulated power for various sections of the TAS3202. Only one external 3.3-V supply is required. All other voltages are generated on chip from the external 3.3-V supply. 4 Functional Description Copyright © 2009–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TAS3202 |
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