PCM1794AQDBRQ1

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The PCM1794AQDBRQ1 is an innovative recording chip delivering unprecedented sound quality and control in a cost-effective and efficient package. Developed by Texas Instruments and launched in 2013, the chip offers tremendous value to consumers and professionals alike. It is suitable for a wide range of audio applications from residential installations to high-end professional systems. In this article, we take a closer look at the PCM1794AQDBRQ1 and its application field and working principle.

Application Field

The PCM1794AQDBRQ1 is designed for digital recording and playback applications. It is easy to incorporate into existing systems, allowing for quick and accurate adjustments to sound quality and control. It offers unprecedented sound quality, with a low-impedance linear phase filter, extended frequency response and low distortion. The integrated PCM1794AQDBRQ1 provides 20-bit stereo and mono input and output, 32-bit effective filtering and I2256-bit sigma-delta conversion. With a sample rate of up to 192kHz, this audio processor is capable of delivering harmonic distortion as low as 0.015%.

The PCM1794AQDBRQ1 also takes advantage of its integrated effects processors, including a two-channel active equalizer, four-band parametric equalizer, compressor/expander, dual-channel noise gate, and single-channel chorus. These processors, in combination with the three analog-to-digital supply bypass pins, provide the user with an unprecedented level of control over their sound.

The PCM1794AQDBRQ1 also features an integrated tri-level crosstalk circuit that further enhances sound quality. This circuit reduces unwanted cross-channel interference and enhances the realism of multi-channel playback. The chip also offers impressive low-noise and low-distortion input and output stages and integrates a power management system with an automatic wake-up feature for efficient battery operation.

Working Principle:

The working principle of the PCM1794AQDBRQ1 is based on the conversion of analog signals into digital data. In the first step, the input signal is amplified and filtered using a biquad filter with a selectable linear phase response. This allows for a wide range of frequencies to be accurately captured. This signal is then converted into high-quality digital output using an I2S signal with a 32-bit effective resolution.

Once the signal has been converted, the chip takes advantage of its two-channel active equalizer and four-band parametric equalizer to produce a sound with accurate and precise sound characteristics. The integrated compressor/expander, dual-channel noise gate, and single-channel chorus are then used to further manipulate the sound. Finally, the digital output is converted back into analog form and transmitted to the outputs.

The PCM1794AQDBRQ1 offers exceptional sound quality and control, enabling users to easily integrate the chip into their audio systems with minimal setup and adjustment. It is suitable for a wide range of applications from residential setups to professional systems.

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