PCM1738E

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Data Acquisition involves measuring physical entities such as voltage and current and converting them into digital data for processing. ADCs and DACs are electronic circuits used for this purpose. Special purpose equivalent circuits are designed to address specific applications, such as PCM1738E.

PCM1738E

PCM1738E is an audio Digital-to-Analog Converter (DAC) designed and manufactured by Texas Instruments (TI). It is widely used in various fields of audio applications due to its high dynamic range, low distortion and good sound quality. It is powered by the highly efficient TI PCM1738E 1-Bit Digital-to-Analog Converter IC, which can convert digital audio samples, stored in memory, into analog audio signals.

Application Field

The PCM1738E is commonly used in high-end audio products such as home theater systems, multimedia speakers, car audio systems, and more. It can also be used to convert digital audio files stored on computers into analog signals. Furthermore, it can be used to build audio amplifiers and audio signal processing complexes. The PCM1738E is particularly suitable for integration into professional studio systems as it is capable of very high resolution with an oversampling rate of up to 96kHz.

Working Principle

The PCM1738E works by converting the digital signal from a 1-Bit, two\'s complement word into an analog signal. It is powered by 6 parallel tied, oversampling sigma-delta modulators. Each of the sigma-delta modulators has two input ports, one for a 16-bit DSM word, and the other for a single bit DSD word. The DSD port is used for selecting which of the 6 modulators is in use, whereas the DSM port can be configured for stepper or ramp mode. In stepper mode, data is sent in a sequence and the sigma-delta modulator is reset once it reaches the 16th bit. In ramp mode, data is sent continuously and the sigma-delta modulator is reset at intervals of 4, 8, or 16 bits.

The PCM1738E also features a digital filter that reduces jitter and unwanted noise by rejecting both low-frequency and high-frequency modulation components. Additionally, it features an analog anti-aliasing filter that suppresses frequency components higher than half of the sampling frequency. This filter is critical for maintaining effective operation of the DAC and preventing unwanted distortion.

Conclusion

The PCM1738E DAC is a high-performance audio converter manufactured by TI for use in audio products. It can convert digital audio signals stored in memory into analog audio signals and can be used in a variety of audio applications, such as for building audio amplifiers and signal processing complexes. It is powered by 6 parallel tied, oversampling sigma-delta modulators, as well as a digital filter and analog anti-aliasing filter.

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