ASM3P2853AG-08SR

Overview

The ASM3P2853AG-08SR is a spread spectrum frequency modulator designed to reduce electromagnetic interference (EMI) in high-speed digital systems. It accepts a 25 MHz input and generates two outputs: an unmodulated 48 MHz USB clock and a 50 MHz clock with ±1% center spread at a 39 kHz modulation rate. The device operates on a 2.5 V supply (±5%) within an ambient temperature range of -40°C to +85°C. It features active-low controls for power-down and spread spectrum enablement, housed in an 8-pin SOIC package.

Feature Summary

• Generates EMI-optimized clocks via spread spectrum modulation
• Provides 48 MHz unmodulated output and 50 MHz modulated output (±1% center spread)
• Supports 25 MHz crystal or external reference input
• Includes dedicated pins for Spread Spectrum ON/OFF and Power Down control

Applications

• PC peripheral devices
• Consumer electronics
• Embedded controller systems

Procurement Notes

Verify the ordering suffix 'G-08SR' corresponds to the 8-pin SOIC tape and reel configuration with green compound and a commercial temperature range of 0°C to +70°C. Confirm that the 'AEC' marking indicates Pb-free status as specified in the manufacturer's documentation. Ensure compatibility with the required 2.5 V supply voltage and 25 MHz input frequency before procurement.

Selection Notes

Select this component when system-level EMI reduction is required without increasing PCB layer counts or shielding costs. It is suitable for designs requiring a stable 48 MHz clock alongside a spread-spectrum 50 MHz clock. Verify that the load capacitance requirements for the connected crystal resonator align with the typical application schematic recommendations.

Part Context

This part belongs to the ASM3P2853A family of peak EMI reducing solutions originally developed by PulseCore Semiconductor, now part of ON Semiconductor. The specific suffix denotes the lead-free (Green) packaging and reel-based delivery format. It serves as a direct replacement for standard clock generators where EMI compliance is critical.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Designers should verify pinout and electrical parameter compatibility if considering alternative spread spectrum modulators from other manufacturers.