原标题：Cypress CY29412可编程晶体振荡器解决方案

　　cypress公司的CY2941x/CY2942x系列是可编基于PLL的晶体振荡器解决方案,输出频率在15MHz和2.1GHz,其它频率可通过I2C接口配置,工作电压1.8V-3.3V,工作温度–40℃到 +105 ℃,非常适合用于通信如OTN, SONET/SDH, xDSL, GbE,网络,无线基础设备,测试和仪表,以及高速数据转换器.本文介绍了CY2941x/CY2942x系列产品主要特性,框图以及评估板CY3676 EVK主要特性,框图,电路图和材料清单.

　　The CY2941x/CY2942x is a programmable PLL-based crystaloscillator solution with flexible output frequency options. It is fieldor factory-programmable for any output frequency between15 MHz and 2.1 GHz. Other frequency options can be configuredwith the I2C interface. Using advanced design technology, itprovides excellent jitter performance across the entire outputfrequency range, working reliably at supply voltages from 1.8 Vto 3.3 V for ambient temperatures from –40℃ to +105℃. Thismakes it ideally suited for communications applications (forexample, OTN, SONET/SDH, xDSL, GbE,networking, wirelessinfrastructure), test and instrumentation applications, andhigh-speed data converters. Additionally, the VCXO functionenables use of the CY2941x/CY2942x series in applicationsrequiring a clock source with voltage control, and in discreteclocking solutions for synchronous timing applications.

　　CY2941x/CY2942x主要特性:

　　■ Low-noise PLL for integrated crystal applications

　　■ Differential Clock Output: re-configurable through I2C

　　■ Output frequency support from 15 MHz to 2.1 GHz

　　■ Fractional N PLL with fully integrated VCO

　　■ Works on an integrated fixed frequency crystal

　　■ LVPECL, LVDS, HCSL, and CML output standards available

　　■ Compatible with 3.3 V, 2.5 V, and 1.8 V supply

　　■ 150 fs typical integrated jitter performance (12 kHz to 20 MHzfrequency offsets) for outputs greater than 150 MHz

　　■ VCXO functionality provided with tunable Total Pull Range(TPR) from ±50 ppm to ±275 ppm

　　■ 8-pin LCC package 7.0x5.0 (CY2941x) or 5.0 x3.2(CY2942x)Mm

　　图1.CY2941x/CY2942x逻辑框图

　　CY29412评估板CY3676 EVK

　　CY3676 EVK is designed to enable you to evaluate the programmable clock device CY29412, the latest addition to programmable devices in Cypress’s timing product portfolio. The clock device CY29412 is a high performance programmable oscillator with one fractional PLL that generates any frequency up to 2.1 GHz with jitter as low as 110 fs. The device offers one differential output. CY29412 comes in 8-pin LCC package for industrial applications. The differential I/O standards supported are LVDS, LVPECL, High-Speed Current Steering Logic (HCSL) and Current Mode Logic (CML). The device also supports features like Voltage-Controlled Crystal Oscillator (VCXO), and provides user with I2C programming interface.

　　The CY3676 EVK allows you to evaluate both AC and DC parameters of the output signals by making required on-board termination settings.

　　The CY3676 EVK includes the following:

　　CY3676 Evaluation Board

　　USB Standard-A to Mini-B cable

　　Quick Start Guide

　　评估板CY3676 EVK主要特性:

　　Generating any frequency output between

　　15MHz and 2100MHz for Differential Outputs

　　15MHz and 250MHz for Single-Ended Outputs

　　Configurable output standards viz., LVPECL, HCSL, CML and LVDS

　　Class leading RMS phase jitter of 110fs

　　Voltage Controlled Crystal Oscillator (VCXO)

　　图2.评估板CY3676 EVK外形图

　　评估板CY3676 EVK材料清单: