ASM3P2869A

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 4mA
Low power CMOS design
Input frequency range: 6MHz to 12MHz for 2.5V
                                      : 6MHz to 13MHz for 3.3V
Generates a 1X low EMI spread spectrum clock of the input frequency
Frequency deviation: ±1%(Typ) @ 10MHz
Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages


Application

The ASM3P2869A 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
TA	Operating temperature	0 to 70
Ts	Max. Soldering Temperature (10 sec)	260
TJ	Junction Temperature	150
TDV	Static Discharge Voltage (As per JEDEC STD22- A114-B)	2	KV
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability.

Description

The ASM3P2869A 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 clockdependent signals. The ASM3P2869A 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 ASM3P2869A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method.

The ASM3P2869A 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'.