ASM3P2812AF-08SR

Overview

The ASM3P2812AF-08SR 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 ranging from 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 using an FCC-approved digital modulation method. It features selectable down or center spread options with eight frequency deviation selections, utilizing an internal loop filter to minimize external components.

Feature Summary

• Generates a 2x spread spectrum clock from 10MHz to 40MHz input frequencies
• Provides up to 15dB EMI attenuation using an FCC-approved all-digital modulation profile
• Features selectable Down/Center spread modes and eight configurable frequency deviation levels
• Includes an internal loop filter to reduce external component count and board space

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 specific ordering suffix matches the required package type and temperature range. The AF suffix indicates an 8-pin SOIC package with a commercial operating temperature range of 0°C to 70°C. Confirm Pb-free status and tape & reel packaging requirements against the official ordering code table before procurement.

Selection Notes

Select this model when a 2x multiplication factor is required for the output clock frequency relative to the input source. Ensure the input frequency falls within the 10MHz to 40MHz range. Compare against ASM3P2811A/B (1x) and ASM3P2814A/B (4x) variants if different multiplication factors are needed for the target application bandwidth.

Part Context

This component belongs to the ASM3P28XX series of versatile spread spectrum frequency modulators manufactured by onsemi. The series includes 1x, 2x, and 4x output variants designed to reduce electromagnetic interference at clock sources. These devices allow system cost savings by reducing the need for additional shielding, ferrite beads, or circuit board layers typically required to pass EMI regulations.

Replacement Considerations

Pin-out compatible with Cypress CY25811, CY25812, and CY25814 devices. Verify functional equivalence regarding spread spectrum parameters and voltage levels when substituting.