2308B-1DCG8

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2308B-1DCG8 is a clock and frequency synthesizer that is part of the larger Clock/Timing product family from Texas Instruments. It is typically used for generating high-performance clock signals for various applications and environments.

This device is a high-frequency (up to 8 GHz) synthesizer with low jitter and low propagation delay spread for applications ranging from timing and clocking in wires, to interfacing with optical networks, to providing multiple drive clocking for data acquisition systems.

The 2308B-1DCG8 is designed to generate precise, low-jitter reference clocks for asynchronous, low-skew clock and data recovery (CDR) applications which includes, but is not limited to, serial backplane and chip-to-chip interfaces, Ethernet and 10G/40G optical transceiver designs.

The 2308B-1DCG8 achieves wide, adjustable high-frequency clock range for demanding applications by using a programmable main oscillator, controllable via a 3.3 V CMOS. This oscillator operates from a single +5 V power supply and can be used with an external reference clock to derive output frequencies up to 8 GHz.

It also includes an integrated loop filter, eliminating the need for external passive components, and can be used in both fractional and integer-N frequency synthesizer modes. Furthermore, its clock synthesizer features jitter-free recovery of input reference clocks as low as 300 kHz.

In terms of its working principle, the 2308B-1DCG8 consists of two main components: a Phase-Locked Loop (PLL) and a Frequency Synthesizer.

The 2308B-1DCG8\'s PLL has a low-frequency reference oscillator, from which the PLL derives its low-frequency clock signals. This data is then sent to the Frequency Synthesizer, which is a digital loop that uses this data to create output signals of various frequencies.

Specifically, the frequency synthesizer utilizes the phase detector, voltage controlled oscillator (VCO), loop filter, programmable divider, and voltage/current/delay control logic to generate an output signal that is adjusted for level, phase, and frequency to match the desired output frequency.

The 2308B-1DCG8 is configurable to achieve multiple drive clock generation with up to 12 programmable outputs. This allows the device to operate in either of the two available modes: configuring the device in single output operation or synchronizing multiple output clocks.

It is also equipped with two Clock Validation (CVT) outputs, allowing it to be used with external frequency monitors to provide a failsafe logic validation feature.

In conclusion, the 2308B-1DCG8 is a high-frequency synthesizer designed for demanding applications such as timing and clocking in wires, interfacing with optical networks, and providing multiple drive clocking for data acquisition systems. It combines the Phase-Locked Loop and Frequency Synthesizer components to generate precise, low-jitter reference clocks from a single +5 V power supply and is also configurable to achieve multiple drive clock generation with up to 12 programmable outputs.

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