ASM3P2812BF-08SR

Overview

The ASM3P2812BF-08SR is a low power EMI reduction IC designed to attenuate electromagnetic interference at clock sources. It generates a 2x spread spectrum clock from an input frequency range of 10MHz to 40MHz, producing an output between 20MHz and 80MHz. Operating on a 3.3V supply, the device features selectable down or center spread options with frequency deviations ranging from ±0.6% to -2.0%. It utilizes an internal loop filter to minimize external components and provides CMOS/TTL compatible outputs.

Feature Summary

• Generates a 2x low EMI spread spectrum clock from 10MHz to 40MHz inputs
• Provides up to 15dB EMI reduction using FCC-approved digital modulation
• Selectable Down or Center spread modes with configurable frequency deviation
• Internal loop filter reduces board space and component count
• Pin-out compatible with Cypress CY25812 devices

Applications

• EMI management for memory interfaces in mobile graphic chipsets
• High-speed digital applications such as PC peripheral devices
• Consumer electronics requiring clock signal noise reduction
• Embedded controller systems

Procurement Notes

Verify the suffix 'BF' corresponds to the SOIC package and commercial temperature range (0°C to 70°C) per the ordering code table. Confirm that the '08SR' designation indicates tape and reel packaging. Ensure the application voltage remains within the 3.0V to 3.6V operating limits.

Selection Notes

Select this model when a 2x frequency multiplication is required alongside EMI spreading. The 'B' variant offers specific deviation ranges (±0.6% to -2.0%) compared to the 'A' variant. Ensure the input clock source falls within the 10MHz to 40MHz range for proper operation.

Part Context

This part belongs to the ASM3P28XX family of spread spectrum frequency modulators. The ASM3P2812 variant specifically handles 2x multiplication, while the ASM3P2811 handles 1x and the ASM3P2814 handles 4x. All variants share similar pinouts and core modulation architectures.

Replacement Considerations

The datasheet explicitly states pin-out compatibility with the Cypress CY25812. Verify functional equivalence regarding spread profiles and jitter specifications before substitution.