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DAC Oversampling Control Options

3.2.3.6Signal Processing 2

The Signal Processing 2 Function menu tab is shown in Figure 3-17.

Figure 3-17. Signal Processing 2 Function Menu Tab

DAC Oversampling Control Options

Select the DAC oversampling control menu to determine the DAC oversampling rate. The oversampling control can be set to either 128fS or a range of 192fS, 256fS, and 384fS.

The DAC oversampling rate range (for 192fS, 256fS, and 384fS) will be selected when the sampling frequency of input data is lower than 24kHz. This oversampling rate moves the out-of-band noise caused by the delta-sigma modulator to a higher frequency domain.

Zero Cross Control Options

Select the Zero cross control to enable the zero crossing function. When zero crossing is enabled, digital attenuation and the analog volume level change at the zero crossing point to avoid an audible zipper noise.

De-Emphasis Filter Options

Select the De-emphasis filter option menu to enable the de-emphasis filter. De-emphasis can be disabled or enabled for an appropriate sampling frequency.

High-Pass Filter Options

Choose the High Pass Filter menu to determine the center frequency (fc) of the incoming analog signal inputs to the ADC.

The cutoff frequency of the ADC high-pass filter is provided as a sampling frequency of 48kHz in this drop down menu, so that the cutoff will be scaled down to the corresponding value when sampling frequencies other than 48kHz (such as 16kHz or 22.05kHz) are used.

The ADC high-pass filter cutoff frequency can be set from this option.

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Set-Up Guide

SBAU127 –July 2007

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Texas Instruments DEM-DAI3793A DAC Oversampling Control Options, Zero Cross Control Options, De-Emphasis Filter Options
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DEM-DAI3793A specifications

The Texas Instruments DEM-DAI3793A is a versatile digital-to-analog converter (DAC) evaluation module designed for assessing the performance and capabilities of TI's DACs in various applications. This module features the high-performance DAC3793, which is widely recognized for its precision and flexibility, making it an ideal choice for audio, industrial automation, and communication systems.

One of the standout features of the DEM-DAI3793A is its ability to support a 16-bit resolution. This high resolution enables the module to provide fine granularity in signal representation, ensuring that even the most subtle changes in the input signal are accurately reflected in the output. The DAC3793 also boasts a high sampling rate, which is crucial for applications that require rapid signal processing and real-time data conversion.

The module incorporates advanced technologies such as dynamic element matching and integrated circuitry to minimize distortion and noise. These technologies are crucial for achieving high-fidelity audio playback and improving overall system performance. Additionally, the DEM-DAI3793A is designed to minimize power consumption while maintaining exceptional performance levels, making it suitable for battery-operated devices and energy-conscious applications.

Another significant characteristic of the DEM-DAI3793A is its ease of integration with various development environments. The evaluation module supports both hardware and software interfacing, allowing engineers to quickly prototype and test their designs. It comes equipped with a USB interface for seamless connectivity with computers, along with supporting software tools that facilitate the configuration and testing of the DAC's functionalities.

The DEM-DAI3793A is also designed with a robust set of output options, including differential and single-ended outputs. This flexibility allows for compatibility with a wide range of amplification and filtering circuits. Furthermore, the evaluation module is equipped with convenient power supply options, enabling it to operate in various settings without the need for extensive modifications.

In conclusion, the Texas Instruments DEM-DAI3793A is an exceptional evaluation module that showcases the capabilities of the DAC3793. With its high resolution, advanced technologies, ease of integration, and flexible output options, it serves as an indispensable tool for engineers and developers working on high-performance audio and data processing applications.
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