PCM1791ADBR Integrated Circuits (ICs)

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PCM1791ADBR application field and working principle

The PCM1791A is a high-performance 24-bit multichannel advanced digital audio converter capable of processing up to 192kHz audio. The PCM1791 family supports sample rate conversion from 32kHz to 192kHz on all sample rate inputs. It is designed for analog-to-digital and digital-to-analog conversion for use in digital audio systems.

It is ideal for use in consumer audio applications, such as A/V receivers, home theater systems, digital television receivers, and digital set-top boxes. It is also suited for studio audio production, professional broadcast equipment, automotive audio, and other digital signal processing applications.

The PCM1791A consists of two 24-bit sigma-delta converters, a programmable digital filter, two digital microphones, a Delay Lock Loop (DLL) that supports sample rate conversion up to 192kHz, and an integrated high-speed serial programming interface. The PCM1791A is available in a 32-pin TQFP and a 48-pin QFN package.

I. Application Field of PCM1791A

The PCM1791A is designed for both analog-to-digital and digital-to-analog conversion for use in digital audio systems. It is ideal for consumer audio applications, such as A/V receivers, home theater systems, digital television receivers, and digital set-top boxes. It is also suited for studio audio production, professional broadcast equipment, automotive audio, and other digital signal processing applications.

II. Working Principle of PCM1791A

The PCM1791A consists of two 24-bit sigma-delta converters, a programmable digital filter, two digital microphones, a Delay Lock Loop (DLL) that supports sample rate conversion up to 192kHz, and an integrated high-speed serial programming interface. The PCM1791A is available in a 32-pin TQFP and a 48-pin QFN package.

The device’s dual 24-bit sigma delta converters are optimized for operation at sampling rates from 32kHz to 192kHz. The sigma-delta processing architecture is designed to provide a wide dynamic range and low-noise audio performance for both analog and digital input signals. The programmable digital filter creates a perfectly linear phase response which helps to prevent digital sound distortion and improve audio quality. Additionally, the digital filter is customizable and can be tuned to the specific application.

The device also features two embedded digital microphones. The embedded digital microphones feature a high dynamic range, wide frequency response, and low distortion. The integrated Delay Lock Loop (DLL) ensures that the sampling rate of the analog-to-digital and digital-to-analog audio converter is accurately maintained, even when the system clock frequency varies. The integrated serial programming interface allows the device to be configured to the specific application requirements.

Conclusion

The PCM1791A is a high-performance 24-bit multichannel advanced digital audio converter designed for both analog-to-digital and digital-to-analog conversion for use in digital audio systems. Its dual 24-bit sigma-delta converters, programmable digital filter, integrated Delay Lock Loop (DLL), and two embedded digital microphones provide a highly efficient and accurate solution for digital audio processing. The device is also supported by an integrated high-speed serial programming interface, making it ideal for a wide range of digital audio applications.

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