ASM3P2872A

Features:

Generates an EMI optimized clock signal at the output
Integrated loop filter components
Operates with a 3.3V / 2.5V supply
Operating current less than 6mA
Low power CMOS design
Input frequency range: 13MHz to 30MHz for 2.5V
                                     : 13MHz to 30MHz for 3.3V
Generates a 1X low EMI spread spectrum clock of the input frequency
Frequency deviation: -1.25% @ 30MHz
Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages.

Application

The ASM3P2872A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and digital still cameras.


Pinout




Specifications

Symbol	Parameter	Rating	Unit
VDD, VIN	Voltage on any pin with respect to Ground	-0.5 to +7.0	V
TSTG	Storage temperature	-65 to +125	°C
TA	Operating temperature	0 to 70 °C	°C
Ts	Max. Soldering Temperature (10 sec)	260	°C
TJ	Junction Temperature	150	°C
TDV	Static Discharge Voltage (As per JEDEC STD22- A114-B)	2	KV

Description

  The ASM3P2872A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. That reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2872A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding that are traditionally required to pass EMI regulations.The ASM3P2872A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method.

  The ASM3P2872A 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. ASM3P2872A 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'.