New York (November 17, 2006)–Cirrus Logic Inc. has introduced the CS4350 digital-to-analog converter (DAC), a stereo audio converter featuring an on-chip phase-locked-loop- (PLL) based master clock that supports 24-bit resolution and up to 216 kHz sampling rates and 108 dB dynamic range.
Because of its on-chip PLL, the CS4350 is being aimed for applications where an audio-related system clock is not present, such as set-top boxes, digital televisions, personal video recorders, DVD players and recorders, A/V receivers and automotive applications such as head units, telematics and in-car entertainment systems.
The CS4350 is based on a multibit Delta Sigma architecture that provides the basis for its dynamic range and out-of-band noise performance. By integrating the PLL, the CS4350 has eliminated the need for external master clock routing across the circuit board by locking to the incoming left-right clock signal, as opposed to the video clock or other high-speed clock sources, thus reducing interference and clock-jitter sensitivity. This feature is said to give system designers” a very high-performance DAC that also simplifies product designs.”
“Having the PLL on-chip simply means that we’ve made it easier for OEMs to develop products with audio quality, but without the need for external clocking components,” said Jason Rhode, vice president and general manager, Cirrus Logic Inc. “Many competitors have DACs with an integrated PLL, but because they typically lock to a high-speed video clock, designers still face the challenge of minimizing system noise incurred by routing a high-speed clock.”
In an effort to further ease product designs, proprietary technologies such as automatic sample-rate detection serve to configure each device in its appropriate operational mode. Further, Cirrus Logic’s PopGuard technology is used to suppress clicks and pops often associated with power cycling. The CS4350 supports all standard PCM audio interface formats as well as the TDM interface, which enables daisy chaining of up to four CS4350s to receive 8-channels of digital audio on a single data stream. Single-ended or differential output architecture provides additional design flexibility.
The CS4350 is available in a 24-pin TSSOP package; it is currently sampling and is expected to be in volume production in the first quarter of calendar year 2007.
Cirrus Logic Inc.