ASM3P2780A datasheet, PDF - EEWORLD Datasheet

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ASM3P2780A: DescriptionLow Power Peak EMI Reducing Solution; File Size173KB，12 Pages; ManufacturerPulseCore Semiconductor Corporation

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ASM3P2780A Overview

Low Power Peak EMI Reducing Solution

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November 2006

rev 1.6

Low Power Peak EMI Reducing Solution

Features

•

ASM3P2780A

The ASM3P2780A uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented by using a proprietary all digital method.

The ASM3P2780A 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’.

Generates an EMI optimized clock signal at the

output.

Integrated loop filter components.

Operates with a 3.3 / 2.5V Supply.

Operating current less than 5mA.

Low power CMOS design.

Input frequency range: 30MHz to 50MHz for 2.5V.

: 30MHz to 50MHz for 3.3V.

Generates a 1X low EMI spread spectrum clock of

the input frequency.

Frequency deviation: ±0.75% (Typ) @46MHz

Input Frequency.

Available in 6 pin TSOT-23, 8 pin SOIC and 8 pin

TSSOP Packages.

Applications

The ASM3P2780A is targeted towards all portable

devices with very low power requirements like MP3

players and digital still cameras.

Product Description

The ASM3P2780A is a versatile spread spectrum

frequency modulator designed specifically for a wide

range of clock frequencies. The ASM3P2780A reduces

electromagnetic interference (EMI) at the clock source,

allowing system wide reduction of EMI of

all clock

dependent signals. The ASM3P2780A allows significant

system cost savings by reducing the number of circuit

board layers ferrite beads, shielding that are traditionally

required to pass EMI regulations.

Key Specifications

Description

Supply voltages

Cycle-to-Cycle Jitter

Output Duty Cycle

Modulation Rate Equation

Frequency Deviation

Specification

= 3.3V / 2.5V

200pS (Max)

45/55%

/1280

±0.75 (Typ) @ 46MHz

Block Diagram

Modulation

XIN/CLKIN

XOUT

Crystal

Oscillator

Frequency

Divider

Feedback

Divider

Phase

Detector

Loop

Filter

PLL

VCO

Output

Divider

ModOUT

PulseCore Semiconductor Corporation

1715 S. Bascom Ave Suite 200, Campbell, CA 95008

•

Tel: 408-879-9077

•

Fax: 408-879-9018

www.pulsecoresemi.com

Notice: The information in this document is subject to change without notice.

ASM3P2780A Related Products

	ASM3P2780A	ASM3P2780AG-06OR	ASM3P2780AG-08SR	ASM3P2780AG-08TR	ASM3P2780AG-08TT	ASM3P2780AF-08TT	ASM3I2780AF-08TT	ASM3P2780AF-08TR	ASM3P2780AF-08SR	ASM3P2780AF-08ST
Description	Low Power Peak EMI Reducing Solution	Low Power Peak EMI Reducing Solution	Low Power Peak EMI Reducing Solution	Low Power Peak EMI Reducing Solution	Low Power Peak EMI Reducing Solution	low power peak emi reducing solution	low power peak emi reducing solution	low power peak emi reducing solution	low power peak emi reducing solution	low power peak emi reducing solution
Is it Rohs certified?	-	conform to	conform to	conform to	conform to	conform to	conform to	conform to	conform to	conform to
Maker	-	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation	PulseCore Semiconductor Corporation
package instruction	-	GREEN, TSOT-23, 6 PIN	GREEN, SOIC-8	GREEN, TSSOP-8	GREEN, TSSOP-8	ROHS COMPLIANT, TSSOP-8	ROHS COMPLIANT, TSSOP-8	ROHS COMPLIANT, TSSOP-8	ROHS COMPLIANT, SOIC-8	ROHS COMPLIANT, SOIC-8
Reach Compliance Code	-	unknow	unknow	unknow	unknow	unknown	unknown	unknown	unknown	unknown
Other features	-	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY	ALSO OPERATES AT 3.3V SUPPLY
JESD-30 code	-	R-PDSO-G6	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8
length	-	2.9 mm	4.9 mm	4.4 mm	4.4 mm	4.4 mm	4.4 mm	4.4 mm	4.9 mm	4.9 mm
Number of terminals	-	6	8	8	8	8	8	8	8	8
Maximum operating temperature	-	70 °C	70 °C	70 °C	70 °C	70 °C	85 °C	70 °C	70 °C	70 °C
Maximum output clock frequency	-	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	VSSOP	SOP	TSSOP	TSSOP	TSSOP	TSSOP	TSSOP	SOP	SOP
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	-	260	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
Master clock/crystal nominal frequency	-	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz	50 MHz
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	1 mm	1.75 mm	1.1 mm	1.1 mm	1.1 mm	1.1 mm	1.1 mm	1.75 mm	1.75 mm
Maximum supply voltage	-	2.625 V	2.625 V	2.625 V	2.625 V	2.625 V	2.625 V	2.625 V	2.625 V	2.625 V
Minimum supply voltage	-	2.375 V	2.375 V	2.375 V	2.375 V	2.375 V	2.375 V	2.375 V	2.375 V	2.375 V
Nominal supply voltage	-	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V
surface mount	-	YES	YES	YES	YES	YES	YES	YES	YES	YES
technology	-	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	INDUSTRIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal form	-	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	-	0.95 mm	1.27 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm	1.27 mm	1.27 mm
Terminal location	-	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	40	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	-	1.6 mm	3.91 mm	3 mm	3 mm	3 mm	3 mm	3 mm	3.91 mm	3.91 mm
uPs/uCs/peripheral integrated circuit type	-	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER

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