Clocking ICs deliver low noise for high-end audio systems

Austin, Tex. — Cirrus Logic Inc. has introduced its CS2XXX family of clocking ICs. Focusing on audio applications such as A/V receivers, mixing consoles, multi-track recorders, digital recorders and set-top boxes, these ICs, which include the CS2000, CS2100, CS2200 and CS2300, provide precise clocking solutions for audio system designs.

The CS2XXX family is based on a hybrid analog/digital design. A Delta-Sigma Fractional-N Analog PLL Frequency Synthesizer is used to generate a low-jitter output clock relative to a reference clock. A Digital PLL can then be used to generate the multiplication factor for the analog PLL.

The 3.3-V CS2XXX family offers an 8 to 75-MHz reference frequency, a 6 to 75-MHz output frequency and a 50 Hz to 30 MHz input sync clock. It also features a jitter reduction/multiplier mode, a typical 75 ps RMS period jitter, and a 1 Hz jitter rejection corner frequency.

Many applications require multiple clocking components to manage a variety of incoming audio signals. The CS2000, for example, is unique because it offers both a clock generator feature and clock cleanup in a single IC, said Cirrus Logic. This integration reduces the number of components and board space required in audio systems. The IC's ability to significantly reduce jitter (noise) compared to current industry solutions makes them suitable for the pro audio and high-end consumer market, as well as mainstream consumer audio/video applications.

In addition, the CS2000 features both frequency synthesis/clock generation from a stable reference clock, as well as generation of a low-jitter clock relative to an external noisy synchronization clock, at frequencies as low as 50 Hz.

The CS2100 features clock multiplication and jitter reduction and is a subset of the CS2000. The CS2200 offers clock generation capability and is a subset of the CS2000, and the CS2300 uses an internal LCO instead of an external crystal or reference clock for performing clocking multiplication and jitter reduction.

Each family offers various modes of control including an I2C/SPI control port for full parameter control and hardware mode controlled by mode pins. The CS2XXX family is available in a 10-pin MSOP package

Pricing: The CS2000 is priced at $2.74, while the CS2100, CS2200, and CS2300 are priced at $1.52 in quantities of 10,000.
Availability: Sampling to customers by the end of the year. Volume production is expected in early 2008. Custom factory configured parts for high volume applications can be delivered in less than three weeks from submission of the desired configuration. Customer one-time programmable (OTP) devices are available for prototyping. A software Configuration Wizard is available with the development hardware.
Product information: CS2000, CS2100, CS2200 and CS2300

Cirrus Logic Inc. , 1-512-851-4000,

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