ASM3P2531A datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > ASM3P2531A

Preview

ASM3P2531A: DescriptionLow Frequency EMI Reduction; File Size189KB，8 Pages; ManufacturerALSC [Alliance Semiconductor Corporation]

Download Datasheet Compare View All

ASM3P2531A Overview

Low Frequency EMI Reduction

Preview

Download Datasheet

View All

November 2003

rev 1.0

ASM3P2531A

Features

FCC approved method of EMI attenuation.

Generates a low EMI spread spectrum of the

input clock frequency.

Optimized for input frequency range between

35MHz – 55MHz.

Internal loop filter minimizes external

components and board space.

Frequency Deviation: ±1.65%.

Low inherent cycle-to-cycle jitter.

3.3 V or 5 V operating voltage.

CMOS/TTL compatible inputs and outputs.

Ultra low power CMOS design: 5.50 mA @3.3 V.

Supports notebook VGA and other LCD timing

controller applications.

Available in 8-pin SOIC and TSSOP.

dependent signals. It allows significant system cost

savings by reducing the number of circuit board layers

and shielding traditionally required to pass EMI

regulations.

The ASM3P2531A modulates the output of a single PLL

in order to spread the bandwidth of a synthesized clock,

thereby decreasing 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 clock generators. Lowering EMI by increasing

a signal’s bandwidth is called spread spectrum clock

generation.

The ASM3P2531A uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented by using a proprietary all-digital method.

Product Description

The ASM3P2531A is a versatile spread spectrum

frequency modulator designed specifically for a wide

range of clock frequencies. It reduces electromagnetic

interference (EMI) at the clock source allowing system-

wide reduction of EMI of downstream clock and data

Applications

The ASM3P2531A is targeted toward the notebook VGA

chip and other displays using an LVDS interface, PC

peripheral devices, and embedded systems

Block Diagram

STOP

VDD

Modulation

CLKIN

Crystal

Oscillator

PLL

Frequency

Divider

Feedback

Divider

Phase

Detector

Loop

Filter

VCO

Output

Divider

MODOUT

VSS

Low Frequency EMI Reduction

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

1 of 8

ASM3P2531A Related Products

	ASM3P2531A	ASM3I2531A-08TR	ASM3I2531A-08TT	ASM3P2531A-08ST	ASM3P2531A-08TT	ASM3P2531A-08TR
Description	Low Frequency EMI Reduction	Low Frequency EMI Reduction	Low Frequency EMI Reduction	Low Frequency EMI Reduction	Low Frequency EMI Reduction	Low Frequency EMI Reduction
Is it Rohs certified?	-	incompatible	incompatible	incompatible	incompatible	incompatible
Maker	-	ALSC [Alliance Semiconductor Corporation]	ALSC [Alliance Semiconductor Corporation]	ALSC [Alliance Semiconductor Corporation]	ALSC [Alliance Semiconductor Corporation]	ALSC [Alliance Semiconductor Corporation]
Parts packaging code	-	SOIC	SOIC	SOIC	SOIC	SOIC
package instruction	-	TSSOP,	TSSOP,	SOP,	TSSOP,	TSSOP,
Contacts	-	8	8	8	8	8
Reach Compliance Code	-	unknow	unknow	unknow	unknow	unknow
ECCN code	-	EAR99	EAR99	EAR99	EAR99	EAR99
JESD-30 code	-	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8
JESD-609 code	-	e0	e0	e0	e0	e0
length	-	4.4 mm	4.4 mm	4.89 mm	4.4 mm	4.4 mm
Number of terminals	-	8	8	8	8	8
Maximum operating temperature	-	70 °C	70 °C	70 °C	70 °C	70 °C
Maximum output clock frequency	-	55 MHz	55 MHz	55 MHz	55 MHz	55 MHz
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	TSSOP	TSSOP	SOP	TSSOP	TSSOP
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
Master clock/crystal nominal frequency	-	55 MHz	55 MHz	55 MHz	55 MHz	55 MHz
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	1.1 mm	1.1 mm	1.8 mm	1.1 mm	1.1 mm
Maximum supply voltage	-	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V
Minimum supply voltage	-	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V
Nominal supply voltage	-	3.3 V	3.3 V	3.3 V	3.3 V	3.3 V
surface mount	-	YES	YES	YES	YES	YES
technology	-	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	-	TIN LEAD	TIN LEAD	TIN LEAD	TIN LEAD	TIN LEAD
Terminal form	-	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	-	0.65 mm	0.65 mm	1.27 mm	0.65 mm	0.65 mm
Terminal location	-	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	-	3 mm	3 mm	3.9 mm	3 mm	3 mm
uPs/uCs/peripheral integrated circuit type	-	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER	CLOCK GENERATOR, OTHER

Recommended Resources

Application circuit diagram of 1880MHz internal collector bias amplifier composed of RF2324

Gas flameout alarm circuit

Car active subwoofer

Positive and negative tracking adjustable voltage regulator circuit diagram

Angel water dispenser, Samsung 57C2304, with LCD display, Protel original screenshot!

Basic feedback amplifier circuit

Request the specific operation process of PCB equal length serpentine line: Recently, when I was wiring the network card driver, I wanted to perform equal-length wiring for the RMII signal line and the clock line in the way of high-frequency signals. My operation steps are as...; Tobey PCB Design

ZLG's ARM development board makes me unhappy: Today I spent 480 to buy the EasyARM2131 learning board at the Beijing office of zlg. 1. But when I came back, I found that there were no ads in the CD (all its routines are based on ADS). I am a novi...; zhang_mike2000 MCU

Recruiting embedded software testers: Recruiting 2-3 software testers. Our department is the R&D department of a factory in Fuyong, Shenzhen (near the airport). We are mainly engaged in the R&D of GPS. Workplace: Shenzhen Nanshan District...; tigerhaha Embedded System

pxa270 wince5.0 lan91c111 driver: I have transplanted the lan91c111 for pxa255 wince4.2 driver to pxa270 wince5.0. Has any expert done it? What parts need to be modified? Please give me some advice. Thank you!...; springsky1984 Embedded System

Relay Isolation Problems: My board uses 430 to control a 220v, 0.3A fan through a 5V electromagnetic relay. Every time the relay is disconnected, there is a lot of interference and the microcontroller crashes. I asked for advi...; shiika Microcontroller MCU

I don't quite understand this thermal imager resolution comparison chart: ...; littleshrimp Talking

Shortcut: L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ N0 N1 N2 N3 N4 N5 N6 N7 N8 NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NX NZ O0 O1 O2 O3 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OP OQ OR OS OT OV OX OY OZ P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ Q1 Q2 Q3 Q4 Q5 Q6 Q8 Q9 QA QB QC QE QF QG QH QK QL QM QP QR QS QT QV QW QX QY R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ

Popular Components