ASM3P2180AF-08SR

Overview

The ASM3P2180AF-08SR is a spread spectrum frequency modulator designed to reduce electromagnetic interference (EMI) at clock sources. It operates with a 3.3 V supply and accepts input frequencies of 6–10 MHz or 18–30 MHz, providing corresponding output signals. The device features selectable down-spread options (-1% to -4%) and integrated loop filter components. Packaged in an 8-pin SOIC, it utilizes a proprietary all-digital modulation method compliant with FCC standards to lower peak harmonic amplitudes.

Feature Summary

• Generates a 1x EMI optimized clock output via spread spectrum modulation
• Supports input/output frequency ranges of 6–10 MHz and 18–30 MHz
• Features two selectable down-spread deviation options controlled by the SS% pin
• Operates on a 3.3 V supply with CMOS design and integrated loop filters

Applications

• Notebook LCD displays
• LVDS interface displays
• PC peripheral devices
• Embedded systems

Procurement Notes

Verify the ordering suffix 'AF-08SR' corresponds to the SOIC-8 NB package and tape & reel shipping configuration. Confirm the operating temperature range is 0°C to 70°C for this specific variant. Ensure compliance requirements such as Pb-Free, Halogen Free, and RoHS status are validated against current manufacturing data.

Selection Notes

Select based on required clock frequency range using the FS pin: 6–10 MHz for FS=0 and 18–30 MHz for FS=1. Choose the spread percentage (-1%, -2%, -3%, or -4%) via the SS% pin according to EMI reduction needs. Ensure the load capacitance does not exceed 15 pF and the supply voltage remains within 2.8 V to 3.7 V.

Part Context

This component belongs to the ASM3P2180A family of peak reducing EMI solutions. It functions as a versatile spread spectrum modulator that modulates a single PLL output to spread clock bandwidth. The device reduces system-wide EMI, potentially lowering circuit board layer counts and shielding requirements.

Replacement Considerations

Compatible alternatives include the ASM3P2812AF-08SR and ASM3P2109A from PulseCore Semiconductor or Alliance Semiconductor. These parts share similar low-power EMI reduction functionalities but may differ in specific frequency ranges or modulation profiles.