CS4348-CZZ

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Data Acquisition - ADCs/DACs - Special Purpose

The CS4348-CZZ is a special purpose analog-to-digital converter (ADC) and digital-to-analog converter (DAC) for high-resolution audio applications. It is a stereo, 8-bit, 24-bit multibit converter with advanced features such as adaptive dither, noise shaping, 128* oversampling, and a patent-pending first order nonlinearity circuit.

Application Field

The CS4348-CZZ is designed for use in professional audio, multimedia and home theater applications. It delivers high performance stereo audio, including playback and recording of DVD audio and other high-resolution digital audio formats. The CS4348-CZZ is also ideal for digital audio processing applications, such as sample rate conversion, digital filter implementation, echo cancellation, and add-on products for digital audio interfaces.

Principle of Working

The CS4348-CZZ features advanced performance characteristics to support the highest fidelity audio applications. The 8-bit multibit converter architecture utilizes a switched-capacitor array of high-precision, low-drift, low-noise metal-oxide-semiconductor (MOS) capacitors to accurately match the desired input voltage. The DAC has a linear transfer function, so the output voltage is always proportional to the original input voltage, as calculated by the following equation: Vout = Vin x Scale Factor.

The CS4348-CZZ\'s analogue-to-digital converter uses noise shaping and adaptive dither to reduce errors caused by quantization and inaccurate timing caused by clock jitter. It achieves this by applying dither before the data is sampled, converting the noise energy into a flat spectrum across all frequencies, which reduces the quantization noise that is usually concentrated in the higher frequency ranges. The adaptive dither then adjusts the amount of dither according to the incoming signal to provide the best possible signal-to-noise ratio.

The CS4348-CZZ also features a patent-pending first-order nonlinearity correction circuit, which further reduces errors caused by quantization. This circuit works by continuously monitoring the converter\'s linearity error, calculating the corresponding compensation required, and applying this correction to the incoming signal before it is sampled.

The CS4348-CZZ is also capable of 128x oversampling, which increases the conversion accuracy and ensures that the ADC\'s low-frequency noise floor is maintained well below any audible levels. This process works by sampling the incoming signal at a higher rate than the Nyquist sampling rate. The higher rate increases the accuracy of the conversion as the time between samples is decreased, allowing for more accurate representations of the original signal.

Finally, the CS4348-CZZ also has a three-pole low-pass filter which is used to reduce noise and alias signals at high-frequencies. This is to ensure that the samples used to reconstruct the analogue signal remain as accurate as possible by eliminating any unwanted signals.

Conclusion

The CS4348-CZZ is a special purpose analogue-to-digital and digital-to-analogue converter for high-resolution audio applications. It is designed for use in professional audio, multimedia and home theater applications and features advanced performance characteristics to support the highest fidelity audio applications. The CS4348-CZZ utilizes a switched-capacitor array of high-precision, low-drift, low-noise metal-oxide-semiconductor (MOS) capacitors to accurately match the desired input voltage, as well as advanced features such as adaptive dither, noise shaping, 128* oversampling and a patent-pending first order nonlinearity correction circuit.

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