ASM3P2109A
ASM3P2109A is Low Power EMI Reduction IC manufactured by Alliance Semiconductor Corporation.
Features
- FCC approved method of EMI attenuation.
- Provides up to 15d B EMI reduction.
- Generates a 4X REF EMI spread output
- Spectrum clock of the input frequency.
- Optimized for input frequency range from 10 to 20MHz.
- External Loop Filter for configurability and flexibility in application and design (spread percentage adjust)
- Reference Output
- Power Down Mode
- Very Low Cycle-to-Cycle Jitter.
- 3.3V operating Range
- CMOS / TTL patible inputs and outputs
- Available in 8-pin SOIC and 8-pin TSSOP packages.
Product Description
The ASM3P2109A device is a versatile spread spectrum Frequency Synthesizer / Modulator designed specifically for a wide Range of input clock frequencies from 10MHz to 20MHz with a 4X multiplier for output clock frequencies from 40MHz to 80 MHz. The ASM3P2109A generates an EMI reduced clock signal from a crystal, ceramic resonator, or system clock. The ASM3P2109A generates a range of modulation rates and deviations (spread) from Center Frequency based upon the input frequency, and is set / determined via an external filter network ( see Loop Filter Selection table ) The ASM3P2109A reduces Electro Magnetic Interference (EMI), at the Clock Source, allowing system wide reduction of EMI on downstream clock and data dependant signals. The resulting EMI reduction provides for significant cost savings by reducing the number of circuit board layers and shielding that are traditionally associated with designs in order to achieve EMI regulatory pliance. The ASM3P2109A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, thereby decreasing the Peak amplitudes of its associated harmonics. This results in significantly lower radiated EMI pared to the narrow band signal produced by standard oscillators and most clock synthesizers & generators. This technique of lowering EMI by increasing the signals bandwidth is called Spread Spectrum Clocking (SSC). The ASM3P2109A utilizes the most efficient and...
