IDT2308B-1DC8

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The IDT2308B-1DC8 is a clock/timing product belonging to the Clock Generators, PLLs (Phase Lock Loop), and Frequency Synthesizers family. The device helps provide frequency synthesis, timing, and/or clock multiplication in systems requiring a 0.266V to 4.5V supply, in order to generate stable clock signals with a minimum of jitter, or to provide the local clock source needed for such systems. The IDT2308B-1DC8 operates over the temperature range of -40C to +85C.

Application Field

The IDT2308B-1DC8 can be used to provide system/peripheral clock signals in multiple control/telecommunication platforms. Examples of these include digital base stations, Digital Video Broadcasting (DVB) systems, servers, handsets, and cellular phones. These systems all require low voltage, low noise and low jitter clock input signals in order to meet performance requirements. The device is also used to provide clock signals for multichannel audio Codecs, video Codecs, video decoders, and other types of audio/video codecs.

Working Principle

The IDT2308B-1DC8 is a highly integrated clock/timing device covering the 0.266V to 4.5V supply range. It utilizes an advanced Phase-Locked-Loop (PLL) general-purpose architecture, and includes the ability to alternately operate as a frequency synthesizer, a timebase generator, a digital frequency multiplier, or a clock generator. It features multiple operating modes that allow designers to select the right operating mode to suit their needs.

In Frequency Synthesizer mode, the PLL is used to synthesize a single clock or Clock Out output frequency as a function of the reference clock frequency and the division ratio. This mode is used to provide direct replacement of the traditional frequency-locked crystal oscillator. The timebase generator mode is used to provide a more accurate and stable clock signal by locking the PLL to an external reference clock. This mode is typically used in communications and timing systems that require precise timing.

The Digital Frequency Multipler provides a divide-by-two frequency multiplication option when locked to an external reference signal. This is beneficial in systems that require the generation of a signal at double the frequency of the reference signal. Additionally, the combination of the Digital Frequency Multipler mode and the Frequency Synthesizer mode can be used to synthesize higher-frequency clock signal outputs. The Clock Generator mode is used to generate a clock signal from an external reference signal by dividing the frequency of the reference signal by a given factor.

In addition to the operating modes described above, the IDT2308B-1DC8 provides a number of features to maximize system performance. These include multiple power management states, a single-ended output, programmable output slew rate, and flexible input and output drive strength levels. Additionally, an auto-calibration feature improves performance by detecting and correcting for internal frequency drift caused by temperature and voltage variations, and an auto-dithering feature helps minimize jitter.

The IDT2308B-1DC8 is an ideal choice for system/peripheral clock signals in multiple control/telecommunication platforms. It can provide a stable clock signal with minimal jitter, as well as the flexibility to synthesize higher frequency clock signals. With its integrated PLL architecture, it is an efficient and cost-effective solution for many clock/timing needs.

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