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Cirrus Logic has introduced digital TV codecs CS42324 and CS42325 to help address the challenges of audio signal management for complex digital TV system designs.To meet the need to adjust audio signals from many input sources, many digital TV audio systems require the integration of complex circuitry, including external multiplexers, operational amplifiers, and input buffers. The highly integrated CS42324 and CS42325 provide system designers with a single IC solution that helps them manage all audio signal transmission without the need for many such separate components.
The CS42324 features a stereo analog-to-digital converter, a four-channel digital-to-analog converter, an input and output multiplexer, line level input buffers and output drivers, and an analog-to-digital converter running at different sample rates. The ability of digital to analog converters. The analog front end of the CS42324 has a 5:1 stereo input multiplexer that helps select the source signal through the data converter or directly into the output driver. The CS42324 accepts line level inputs up to 2Vrms to ensure compliance with SCART European standards. The six 2Vrms output drivers can be driven directly from a stereo DAC or input. Each output channel uses Cirrus Logic's patented Popguard® technology to significantly reduce the output transient effects common to single-ended, single-supply converters.
The CS42324's independent serial port facilitates on-board analog-to-digital and digital-to-analog converters operating at different asynchronous sample rates to simplify system-level design for managing audio streams. Audio streams often use different sampling rates, such as S/PDIF receivers, memory card interfaces, HDMI inputs, and TV tuners. The codec operates from a 3.3V single digital supply and a 9V or 12V analog supply, enabling 2Vrms input/output drive capability and advanced multi-bit delta-sigma data conversion at 24-bit conversion rate and 96kHz sample rate. . Personalized digital sound control such as 0.5dB steps, selectable soft ramps and zero-crossover conversion ensures no breaks. Channel squelch can be implemented by hardware or software control to further improve sound quality and eliminate noise and breaks in power cycling, power switching, and clock changes.
The CS42325 and CS42324 are hardware and software compatible, with one of the three stereo output pairs with an on-chip stereo headphone driver. High compatibility provides manufacturers with a scalable audio solution that helps them reduce the development of the entire product line.
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