NOTICE - The following device(s) are recommended alternatives:

The 843002I-40 is a PLL based synchronous clock generator that is optimized for SONET/SDH line card applications where jitter attenuation and frequency translation is needed. The device contains two internal PLL stages that are cascaded in series. The first PLL stage uses a VCXO which is optimized to provide reference clock jitter attenuation and to be jitter tolerant, and to provide a stable reference clock for the 2nd PLL stage (typically 19.44MHz). The second PLL stage provides additional frequency multiplication (x32), and it maintains low output jitter by using a low phase noise FemtoClock VCO. PLL multiplication ratios are selected from internal lookup tables using device input selection pins. The device performance and the PLL multiplication ratios are optimized to support non-FEC (non-Forward Error Correction) SONET/SDH applications with rates up to OC-48 (SONET) or STM-16 (SDH). The VCXO requires the use of an external, inexpensive pullable crystal. VCXO PLL uses external passive loop filter components which are used to optimize the PLL loop bandwidth and damping characteristics for the given line card application. The 843002I-40 includes two clock input ports. Each one can accept either a single-ended or differential input. Each input port also includes an activity detector circuit, which reports input clock activity through the LOR0 and LOR1 logic output pins. The two input ports feed an input selection mux. "Hitless switching" is accomplished through proper filter tuning. Jitter transfer and wander characteristics are influenced by loop filter tuning, and phase transient performance is influenced by both loop filter tuning and alignment error between the two reference clocks. Typical 843002I-40 configuration in SONET/SDH Systems:

  • VCXO 19.44MHz crystal
  • Input Reference clock frequency selections:
    19.44MHz, 38.88MHz, 77.76MHz, 155.52MHz, 311.04MHz, 622.08MHz
  • Output clock frequency selections:
    19.44MHz, 77.76MHz, 155.52MHz, Hi-Z

特性

  • Two Differential LVPECL outputs
  • Selectable CLKx, nCLKx differential input pairs
  • CLKx, nCLKx pairs can accept the following differential input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL or single-ended LVCMOS or LVTTL levels
  • Maximum output frequency: 175MHz
  • FemtoClock VCO frequency range: 560MHz - 700MHz
  • RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal (12kHz to 20MHz): 0.81ps (typical)
  • Full 3.3V or mixed 3.3V core/2.5V output operating supply
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

产品选择

下单器件 ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete VFQFPN 32 I 是的 Tray
Availability
Obsolete VFQFPN 32 I 是的 Reel
Availability

文档和下载

文档标题 其他语言 类型 文档格式 文件大小 日期
数据手册与勘误表
843002I-40 Datasheet 数据手册 PDF 441 KB
应用指南 &白皮书
AN-828 Termination - LVPECL 应用文档 PDF 322 KB
AN-841 Pullable Crystal Selection and VCXO Tuning 应用文档 PDF 334 KB
AN-831 The Crystal Load curve 应用文档 PDF 395 KB
AN-848 VCXO - Crystal Selection 应用文档 PDF 222 KB
AN-849 Loop Filter Component Selection for VCXO Based PLLs 应用文档 PDF 218 KB
AN-847 VCXO - Absolute Pull Range 应用文档 PDF 155 KB
AN-842 Thermal Considerations in Package Design and Selection 应用文档 PDF 495 KB
AN-840 Jitter Specifications for Timing Signals 应用文档 PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations 应用文档 PDF 115 KB
AN-839 RMS Phase Jitter 应用文档 PDF 233 KB
AN-836 Differential Input to Accept Single-ended Levels 应用文档 PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced 应用文档 PDF 160 KB
AN-830 Quartz Crystal Drive Level 应用文档 PDF 143 KB
AN-827 Application Relevance of Clock Jitter 应用文档 PDF 1.15 MB
AN-815 Understanding Jitter Units 应用文档 PDF 565 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance 应用文档 PDF 136 KB
AN-801 Crystal-High Drive Level 应用文档 PDF 202 KB
AN-806 Power Supply Noise Rejection 应用文档 PDF 438 KB
AN-805 Recommended Ferrite Beads 应用文档 PDF 121 KB
PCN / PDN
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility 产品变更通告 PDF 983 KB
PDN# : CQ-19-01(R1) Quarterly Market Declined PDN 产品停产通告 PDF 1014 KB
PDN# : CQ-19-01 Quarterly Market Declined PDN 产品停产通告 PDF 537 KB
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location 产品变更通告 PDF 583 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location 产品变更通告 PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location 产品变更通告 PDF 544 KB
PDN# : N-12-22R2 PRODUCT DISCONTINUANCE NOTICE 产品停产通告 PDF 363 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products 产品变更通告 PDF 361 KB
PDN# : N-12-22R1 PRODUCT DISCONTINUANCE NOTICE 产品停产通告 PDF 209 KB
Downloads
843002I-40 IBIS 模型 - IBIS ZIP 64 KB
其他
Timing Solutions Products Overview 概览 PDF 4.11 MB
IDT Clock Generation Overview 日本語 概览 PDF 1.83 MB
IDT Clock Distribution Overview 日本語 概览 PDF 3.79 MB