ASM3P2182AF-08SR

Overview

The ASM3P2182AF-08SR is a spread spectrum frequency modulator designed for EMI attenuation in LCD panel and high-speed digital applications. It accepts input clock frequencies from 25MHz to 210MHz and generates a center-spread low EMI output. The device operates at 3.3V with TTL or CMOS compatible inputs and outputs. Key electrical parameters include a dynamic supply current of up to 17.78mA, cycle-to-cycle jitter of ±360ps, and output rise/fall times of 1.4ns/1.0ns. It features four selectable spread deviation ranges and utilizes an internal loop filter to minimize external components.

Feature Summary

• Generates center spread spectrum clock with up to 15dB EMI reduction
• Supports input frequencies from 25MHz to 210MHz via FS0/FS1 selection
• Four selectable spread deviation options ranging from ±0.13% to ±1.24%
• Low inherent cycle-to-cycle jitter of ±360ps

Applications

• LCD Panel EMI Reduction
• Mobile graphic chipset memory and LVDS interfaces
• PC peripheral devices and consumer electronics
• Embedded controller systems

Procurement Notes

Verify the ordering suffix 'SR' corresponds to Tape & Reel packaging and 'AF' indicates Pb-free status as specified in the datasheet. Confirm the operating temperature range is 0°C to +70°C for this specific variant. Ensure compatibility with 3.3V logic levels and check that the 8-pin SOIC package dimensions match the design footprint.

Selection Notes

Select based on required input frequency range using FS0 and FS1 pins to define bands between 25MHz and 210MHz. Choose spread deviation settings (S0/S1) according to EMI requirements, noting that deviation values vary by frequency band. Ensure the application supports the 3.3V operating voltage and accommodates the maximum dynamic supply current of 17.78mA.

Part Context

This component belongs to the ASM3P21xx series of EMI reduction ICs manufactured by ON Semiconductor. It is functionally similar to other parts in the family but specifically configured for 8-pin SOIC packaging. The device replaces traditional passive EMI suppression methods like ferrite beads and shielding by actively spreading the clock spectrum.

Replacement Considerations

Datasheet lists no direct public substitute part numbers. Cross-reference with other ASM3P21xx variants if pinout or package differences are acceptable.