ASM3P2812AF-08TR

Overview

The ASM3P2812AF-08TR is a low power EMI reduction IC designed as a spread spectrum frequency modulator. It generates a 2x low EMI spread spectrum clock from an input frequency range of 10MHz to 40MHz, producing an output between 20MHz and 80MHz. Operating at 3.3V with CMOS/TTL compatible inputs and outputs, the device provides up to 15dB of EMI reduction. It features selectable down or center spread options with eight frequency deviation selections ranging from ±0.625% to -3.5%. The component utilizes an internal loop filter to minimize external components and is housed in an 8-pin TSSOP package.

Feature Summary

• Generates a 2x spread spectrum clock from 10MHz to 40MHz input frequencies
• Provides up to 15dB EMI attenuation using FCC-approved digital modulation
• Configurable spread options (Down/Center) and frequency deviations via logic pins
• CMOS/TTL compatible I/O with 3.3V operating voltage

Applications

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

Procurement Notes

Verify that the ordering suffix 'TR' corresponds to the Tape & Reel packaging configuration specified in the datasheet. Confirm the 'F' designation indicates Pb-free compliance. Ensure the selected variant matches the required temperature range and package type for the target assembly process.

Selection Notes

Select this model when a 2x multiplication factor is required for the spread spectrum clock generation. Compare against ASM3P2811A/B for 1x output or ASM3P2814A/B for 4x output based on the specific system clock requirements. Verify that the input frequency falls within the 10MHz to 40MHz operational range.

Part Context

This component belongs to the ASM3P28XX series of versatile spread spectrum frequency modulators manufactured by onsemi. The series includes variants optimized for different multiplication factors: ASM3P2811 (1x), ASM3P2812 (2x), and ASM3P2814 (4x). These devices are engineered to reduce electromagnetic interference by spreading the bandwidth of synthesized clocks.

Replacement Considerations

Pin-out compatible with Cypress CY25811, CY25812, and CY25814 devices.