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P277G, P2781, P2781A

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Info of P277G
Info of P2781
Info of P2781A

P277G, P2781, P2781A Selling Leads, Datasheet

MFG:305 Package Cooled:SOP8 D/C:03+

P277G, P2781, P2781A Datasheet download

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Part Number: P277G

MFG: 305

Package Cooled: SOP8

D/C: 03+

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P2781 General Description

The P278xA is a versatile spread spectrum frequency modulator designed specifically for digital camera and other digital video and imaging applications. The P278xA reduces electromagnetic interference (EMI) at the clock source, which provides system wide reduction of EMI of all clock dependent signals. The P278xA allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations.

The P278xA uses the most efficient and optimized modulation profile approved by the FCC. The P278xA 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.

P2781 Maximum Ratings

Symbol	Parameter	Rating	Unit
V_DD	Supply voltage, DC	(V_SS 0.5) to 7	V
V_I	Input voltage, DC	(V_SS-0.5) to (V_DD+0.5)	V
V_O	Output voltage, DC	(V_SS-0.5) to (V_DD+0.5)	V
I_IK	Input clamp current (V_I<0 or V_I>V_DD)	-50 to +50	mA
I_OK	Output clamp current (V_I<0 or V_I>V_DD)	-50 to +50	mA
T_S	Storage temperature	-65 to +125	°C
T_A	Ambient temperature range, under bias	-55 to +125	°C
T_J	Junction temperature	150	°C
	Lead temperature (soldering 10 sec)	260	°C
	Input static discharge voltage protection (As per JEDEC STD22- A114-B)	2	KV

Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability.

P2781 Features

·Provides up to 15dB of EMI suppression
·FCC approved method of EMI attenuation
·Generates a 1X, 2X, and 4X low EMI spread spectrum clock of the input frequency
·Input frequency range from 3 to 78MHz
·External loop filter for spread % adjustment
·Spreading ranges from ±0.25% to ±5.0%
·Ultra low cycle-to-cycle jitter
·Zero-cycle slip
·3.3V operating voltage range
·10 mA output drives
·TTL or CMOS compatible outputs
·Ultra-low power CMOS design
·P278XA is available in 8 pin SOIC and TSSOP Packages
·Available for industrial and automotive temperature ranges.

P2781 Typical Application

The P278xA is targeted towards MFP, xDSL, fax modem,set-top box, USB controller, DSC, and embedded systems.

P2781 Connection Diagram

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