Features: · FCC approved method of EMI attenuation.
· Provides up to 15dB EMI reduction.
· Generates a 1X low EMI spread spectrum clock of the input frequency.
· Input frequency range: 6MHz to 103MHz.
· Internal loop filter minimizes external components and board space.
· Selectable spread options: Down and Center Spread
· 2 spread frequency deviation selections: o -1.25% or ± 0.42%
· Low inherent cycle-to-cycle jitter.
· 3.3V operating voltage range.
· Low power CMOS design.
· Supports notebook VGA and other LCD timing controller applications.
· Products are available for industrial temperature range.
· Available in 8-pin SOIC and TSSOP.ApplicationThe ASM3P2183A is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and high-speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems.
Pinout
Specifications
|
Symbol |
Parameter |
Rating |
Units |
| VDD,VIN |
Voltage on any pim with respect to ground |
-0.5 to 7.0 |
V |
| TSTG |
Storage Temperature |
-65 to +125 |
|
| TA |
Operating Temperature |
0 to 70 |
|
Note:These are Stress ratings Only,and functional operation is not implied.Exposure to absolute maximum ratings for extended periods may affect device reliability...
DescriptionThe ASM3P2183 is a versatile spread spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 6MHz to 103MHz. (Refer Input Frequency and Modulation Rate Table). The ASM3P2183A can generate an EMI reduced clock from an OSC or a system generated clock. The ASM3P2183A offers a Down Spread clock with a percentage deviation of -1.25% and a Center Spread clock with a percentage deviation of ± 0.42%.
The ASM3P2183A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2183A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations.
The ASM3P2183A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method.
The ASM3P2183A modulates the output of a single PLL in order to "spread" the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal's bandwidth is called 'spread spectrum clock generation'.
ASM3P2183A Data Sheet
