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Timing

CS2500

Fractional-N Clock Synthesizer and Multiplier

CS2500 Overview

The CS2500 is a system-clocking device incorporating a programmable phase-locked loop (PLL). The hybrid analog/ digital PLL architecture comprises a delta-sigma fractional-N analog PLL and a digital frequency-locked loop (FLL). The CS2500 enables frequency synthesis and clock generation from a stable timing reference clock. The device can generate low-jitter clocks from a noisy clock reference at frequencies as low as 150 Hz. The CS2500 can be configured using a control interface supporting I2C and SPI modes of operation. The CS2500 can be powered from a single 1.8 V or 3.3 V supply. The device combines high performance with low power consumption. The CS2500 is available in commercial-grade 10-pin TSSOP package for operation from –40°C to +85°C. The device is also available in the AEC-Q100-qualified grade-2 package for operation from –40°C to +105°C.

Product Features

  • High-performance analog/digital phase locked loop

  • Clock frequency synthesizer incorporating delta-sigma fractional-N analog PLL

    • Generates low-jitter 6–75 MHz clock (CLK_OUT) from 8–75 MHz timing reference (REF_CLK_IN)

  • Fractional clock multiplier and jitter reduction using hybrid analog/digital PLL

    • Generates low-jitter 6–75 MHz clock (CLK_OUT), synchronized to a 150 Hz–30 MHz low-quality or intermittent frequency reference (CLK_IN)

  • Flexible timing reference source

    • External clock or external crystal

  • Great performance

    • High resolution PLL ratio (1 PPM)

    • 18 psRMS period jitter

  • Glitchless clock output generated from intermittent input

  • I2C/SPI control port

  • Configurable auxiliary clock/status output

  • Minimal board space required

    • No external analog loop-filter components

  • Pin-to-pin, register map, and control compatible with CS2000 and CS2200

  • Single-supply operation at 1.8 V or 3.3 V

Parametric Specifications

Package10L-TSSOP
Host InterfaceYes
Clock Multiplier / Jitter RemovalYes
Frequency Synth / Clock GeneratorYes
Output Frequency Range (MHz)6-75
Reference Frequency Range (MHz)8-75
Power Supply (V)1.8-3.3
One-Time ProgrammableNo

Design Resources

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Evaluation Boards

  • Hazelburn System (CDB-CLOCKING)

    Hazelburn System (CDB-CLOCKING)

    The Hazelburn system (CDB-CLOCKING-MB with daughter cards) is the development platform for the Cirrus Logic high-performance clocking devices CS2500, CS2501 and CS2600. It supports clock inputs and clock outputs and allows configuration and programming for a variety of possible use cases. This board provides all clock I/O connectors, control switches, power supplies and control-interface hardware.

    Order SampleUser Guide

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