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Complete Stereo Analog-to-Digital Converter for Digital Audio Systems CS5333 to CS5340

Complete Stereo Analog-to-Digital Converter for Digital Audio Systems CS5333 to CS5340

The CS5333 and CS5340 are complete stereo analog-to-digital converters for digital audio systems. These converters perform sampling, analog-to-digital conversion, and anti-aliasing filtering to generate 24-bit values ​​for the left and right channels. These small, low-power converters are ideal for systems requiring wide dynamic range and low noise, such as set-top boxes, A/V receivers, DVD karaoke players, DVD recorders and automotive applications. The CS5333 is no longer recommended for new designs, and the CS5340 is the recommended replacement.

The CS5333 and CS5340 are complete stereo analog-to-digital converters for digital audio systems. These converters perform sampling, analog-to-digital conversion, and anti-aliasing filtering to generate 24-bit values ​​for the left and right channels. These small, low-power converters are ideal for systems requiring wide dynamic range and low noise, such as set-top boxes, A/V receivers, DVD karaoke players, DVD recorders and automotive applications. The CS5333 is no longer recommended for new designs, and the CS5340 is the recommended replacement.

Typical Connection Diagram

Figure 1 and Figure 2 illustrate typical connection diagrams for the CS5333 and CS5340, respectively. The analog and digital cores of the CS5333 are powered by VA and can be set from 1.8 V to 3.3 V and can be set independently of VA.

Complete Stereo Analog-to-Digital Converter for Digital Audio Systems CS5333 to CS5340

The CS5340 has separate power pins for the analog and digital cores. The analog part is powered by VA power supply and the digital part is powered by VD power supply. Both of these power pins can be powered from the same external power supply, using a small series resistor between them to isolate noise. Both the analog core and the digital core can operate independently from 3.3 V to 5.0 V. The VL pin of the CS5340 provides digital interface logic, supports a wide operating range from 1.8 V to 5.0 V, and is independent of the VA and VD power supplies.

Complete Stereo Analog-to-Digital Converter for Digital Audio Systems CS5333 to CS5340

Input filter topology

Both the CS5333 and CS5340 implement a single-ended input architecture. Due to differences in the input sampling topology within the converter, the input filter requirements for the two devices are different.

The suggested input filter topology for the CS5333 is shown in Figure 3. The input network consists of AC coupling capacitors and a single-pole low-pass filter.

Complete Stereo Analog-to-Digital Converter for Digital Audio Systems CS5333 to CS5340

The CS5333 will self-bias the analog input node to the optimum bias point (half VA). The CS5333 implements an internal buffer on the analog input, reducing the amount of switching current on the input sampling node. The reduction in switch current makes the CS5333 less sensitive to series resistance on the analog input lines.

The suggested filter topology for the CS5340 is shown in Figure 4.

Complete Stereo Analog-to-Digital Converter for Digital Audio Systems CS5333 to CS5340

in conclusion

The CS5340 is the recommended replacement for the CS5333, with higher performance and 192 kHz output sample rate capability. Special care must be taken when upgrading a design to use the CS5340 in place of the CS5333. These considerations include pin compatibility, functional mode selection, input filter design, and external capacitor requirements on the FITL+ reference pin.

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