P2782AF-08SR

Clock Generators, PLLs, Frequency Synthesizers Overview

The P2782AF-08SR is a general-purpose EMI reduction IC from ON Semiconductor, part of the P278xA family. It functions as a spread spectrum frequency modulator designed to reduce electromagnetic interference at clock sources for digital video and imaging applications. The device accepts an input frequency between 3 MHz and 78 MHz and generates a low EMI spread spectrum clock with output scaling options of 1X, 2X, or 4X. Specifically, the P2782A variant provides an output frequency range of 6 MHz to 156 MHz. It utilizes an FCC-approved modulation method to suppress EMI by up to 15 dB while maintaining ultra-low cycle-to-cycle jitter and zero-cycle slip.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Provides up to 15 dB of EMI suppression using an FCC-approved spread spectrum method
• Generates 1X, 2X, and 4X low EMI spread spectrum clocks from a single input
• Supports input frequencies from 3 MHz to 78 MHz with adjustable spreading ranges
• Operates on a 3.3V supply with ultra-low power CMOS design

Clock Generators, PLLs, Frequency Synthesizers Applications

• Digital Still Cameras (DSC)
• Multi-Function Printers (MFP)
• xDSL and Fax Modems
• Set-top Boxes
• USB Controllers

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering suffix 'SR' indicates tape and reel packaging rather than tube configuration. Confirm the 'P' prefix denotes commercial temperature range (0°C to +70°C) versus the 'I' prefix for industrial range (-40°C to +85°C). Ensure the specific part number matches the required output frequency scaling capabilities for the target application design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the P2782A variant when the system requires an output frequency range of 6 MHz to 156 MHz derived from a 3 MHz to 78 MHz input. Configure the external loop filter components (C1, C2, R1) based on the Loop Filter Selection Table to achieve the desired bandwidth percentage. Set FS0 and FS1 logic pins according to the Input Frequency Selection Table to define the operating range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the P2781/82/84 series of spread spectrum clock generators. The P2782A specifically offers double the output frequency scaling compared to the P2781A and half that of the P2784A. All variants share identical pinouts, package types, and core modulation features within the 8-pin SOIC form factor.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The datasheet lists P2781AF-08ST, I2781AF-08ST, I2781AG-08SR, P2784AF-08SR, and their tube/reel equivalents as related parts in the same family. No direct cross-model substitutes are explicitly confirmed in the provided documentation.