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8442

Obsolete

LVDS Frequency Synthesizer

Overview

The 8442 is a general purpose, dual output Crystal-to-Differential LVDS High Frequency Synthesizer. The 8442 has a selectable TEST_CLK or crystal input. The TEST_CLK input accepts LVCMOS or LVTTL input levels and translates them to LVDS levels. The VCO operates at a frequency range of 250MHz to 700MHz. The VCO frequency is programmed in steps equal to the value of the input reference or crystal frequency. The VCO and output frequency can be programmed using the serial or parallel interface to the configuration logic. The low phase noise characteristics of the 8442 makes it an ideal clock source for Gigabit Ethernet and Sonet applications.

8442 - Block Diagram
8442 - Pinout
8442 - Block Diagram
8442 - Pinout
  • Dual differential LVDS outputs
  • Selectable crystal oscillator interface or
  • LVCMOS/LVTTL TEST_CLK
  • Output frequency range: 31.25MHz to 700MHz
  • Crystal input frequency range: 10MHz to 25MHz
  • VCO range: 250MHz to 700MHz
  • Parallel or serial interface for programming counter and output dividers
  • RMS period jitter: 2.7ps (typical)
  • Cycle-to-cycle jitter: 18ps (typical)
  • 3.3V supply voltage
  • -40°C to 85°C ambient operating temperature

Documentation

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

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Diagram of ECAD Models

Models
Type Title Date
Model - IBIS
8442 3.3V IBIS Model
ZIP 56 KB
Model - IBIS
8442I 3.3V IBIS Model
ZIP 56 KB
2 items

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