ASM3P2182A-08ST - ON Semiconductor L.L.C.

August, 2011 − Rev. P3

1Publication Order Number:

ASM3P2182A/D

ASM3P2182A

Product Preview

LCD Panel EMI Reduction IC

Description

The ASM3P2182A is a versatile spread spectrum frequency

modulator designed specifically for a wide range of input clock

frequencies from 25 MHz to 210 MHz. (Refer to Input Frequency and

Modulation Rate Table). The ASM3P2182A can generate an EMI

reduced clock from an OSC or a system generated clock. The

ASM3P2182A offers a Center Spread clock and with a percentage

deviation from ± 0.13% or ± 1.24%.

The ASM3P2182A reduces electromagnetic interference (EMI) at

the clock source, allowing system wide reduction of EMI of down

stream clock and data dependent signals. The ASM3P2182A allows

significant system cost savings by reducing the number of circuit

board layers ferrite beads, shielding and other passive components that

are traditionally required to pass EMI regulations.

The ASM3P2182A uses the most efficient and optimized

modulation profile approved by the FCC and is implemented in a

proprietary all digital method.

The ASM3P2182A 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.’

Applications

The ASM3P2182A is targeted towards EMI management for

memory and LVDS interfaces in mobile graphic chipsets and

high−speed digital applications such as PC peripheral devices,

consumer electronics, and embedded controller systems.

Features

•FCC Approved Method of EMI Attenuation

•Provides up to 15 dB EMI Reduction

•Generates a 1X Low EMI Spread Spectrum Clock of the Input Frequency

•Input Frequency Range: 25 MHz to 210 MHz

•Internal Loop Filter Minimizes External Components and Board Space

•Center Spread

•4 Spread Frequency Deviation Selections: ± 0.13% to ± 1.24%

•Low Inherent Cycle−to−Cycle Jitter

•3.3 V Operating Voltage

•TTL or CMOS Compatible Inputs and Outputs

•Low Power CMOS Design

•Supports Notebook VGA and Other LCD Timing Controller Applications

•Products are Available for Industrial Temperature Range

•Available in 8−pin SOIC and TSSOP Packages

•These are Pb−Free Devices

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

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SOIC−8

S SUFFIX

CASE 751BD

PIN CONFIGURATION

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 6 of this data sheet.

ORDERING INFORMATION

FS1

FS0

VDD

ModOUT

GND

CLKIN

TSSOP−8

T SUFFIX

CASE 948AL

ASM3P2182A

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Figure 1. Block Diagram

ModOUT

PLL

CLKIN Crystal

Oscillator

VSS

VDD

FS0 FS1

VCO Output

Divider

Loop

Filter

Phase

Detector

Modulation

Frequency

Divider

Feedback

Divider

Table 1. PIN DESCRIPTION

Pin # Pin Name Type Description

1 CLKIN I Connect to externally generated clock signal.

2 GND P Ground to entire chip.

3 S1 I Spread range select. Digital logic input used to select frequency deviation

(Refer to Spread Deviation Table). This pin has an internal pull−up resistor.

4 S0 I Spread range select. Digital logic input used to select frequency deviation

(Refer to Spread Deviation Table). This pin has an internal pull−up resistor.

5 ModOUT O Spread spectrum low EMI output.

6 VDD P Power supply for the entire chip (3.3 V).

7 FS0 I Frequency range select. Digital logic input used to select frequency range

(Refer to Input Frequency and Modulation Rate Table).

This pin has an internal pull−up resistor.

8 FS1 I Frequency range select. Digital logic input used to select frequency range

(Refer to Input Frequency and Modulation Rate Table).

This pin has an internal pull−up resistor.

Table 2. INPUT FREQUENCY AND MODULATION RATE TABLE

FS1 (pin 8) FS0 (pin 7) Frequency Range

0 0 25 MHz to 50 MHz

0 1 50 MHz to 103 MHz

1 0 75 MHz to 150 MHz

1 1 160 MHz to 210 MHz

Table 3. SPREAD DEVIATION SELECTION TABLE

S1 S0

Spreading Range (+%)

25 MHz 40 MHz 65 MHz

81 MHz

(Note 1)

81 MHz

(Note 2) 108 MHz 120 MHz 162 MHz 200 MHz

0 0 0.28 0.19 0.15 0.12 0.18 0.15 0.1 0.1 0.06

0 1 0.8 0.3 0.3 0.2 0.5 0.3 0.19 0.3 0.1

1 0 1.2 0.54 0.45 0.4 0.8 0.6 0.36 1.0 0.6

1 1 2.1 1.0 1.1 0.9 1.4 1.1 0.75 1.9 1.2

1. Frequency Range: 50 MHz to 103 MHz

2. Frequency Range: 75 MHz to 150 MHz

ASM3P2182A

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Table 4. ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Rating Unit

VDD Supply Voltage pin with respect to Ground −0.5 to +4.6 V

VIN Input Voltage pin with respect to Ground VSS−0.5 to VDD+0.5 V

VOUT Output Voltage pin with respect to Ground VSS−0.5 to VDD+0.5 V

TSTG Storage temperature −55 to +125 °C

TsMax. Soldering Temperature (10 sec) 260 °C

TJJunction Temperature 150 °C

TDV Static Discharge Voltage (As per JEDEC STD22−A114−B) 2 KV

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

Table 5. RECOMMENDED OPERATING CONDITIONS

Parameter Description Min Typ Max Unit

VDD Operating Voltage 2.7 3.3 3.7 V

TA Operating Temperature (Ambient Temperature) 0 +70 °C

CL Load Capacitance 15 pF

CIN Input Capacitance 5 pF

Table 6. DC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit

VIL Input low voltage GND – 0.3 0.8 V

VIH Input high voltage 2.0 VDD + 0.3 V

IIL Input low current −35 mA

IIH Input high current 35 mA

VOL Output low voltage (VDD = 3.3 V, IOL = 20 mA) 0.4 V

VOH Output high voltage (VDD = 3.3 V, IOH = 20 mA) 2.5 V

ICC Dynamic supply current

Normal mode (3.3 V and 10 pF loading)

8.46 12 17.78 mA

IDD Static supply current

Standby mode (Note 3)

0.6 mA

VDD Operating voltage 2.7 3.3 3.7 V

tON Power up time

(first locked clock cycle after power up)

0.18 mS

ZOUT Clock out impedance 50 W

3. CLKIN pin is pulled low.

Table 7. AC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit

CLKIN Input frequency 25 210 MHz

ModOUT Output frequency 25 210 MHz

tLH (Note 4) Output rise time (measured at 0.8 V to 2.0 V) 1.2 1.32 1.4 nS

tHL (Note 4) Output fall time (measured at 2.0 V to 0.8 V) 0.8 0.9 1.0 nS

tJC Jitter (cycle to cycle) 360 pS

TDOutput duty cycle 45 50 55 %

4. tLH and tHL are measured into a capacitive load of 15 pF.

ASM3P2182A

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PACKAGE DIMENSIONS

TSSOP8, 4.4x3

CASE 948AL−01

ISSUE O

E1 E

TOP VIEW

SIDE VIEW END VIEW

L1 L

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MO-153.

SYMBOL

MIN NOM MAX

0º 8º

0.05

0.80

0.19

0.09

0.50

2.90

6.30

4.30

0.65 BSC

1.00 REF

1.20

0.15

1.05

0.30

0.20

0.75

3.10

6.50

4.50

0.90

0.60

3.00

6.40

4.40

ASM3P2182A

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PACKAGE DIMENSIONS

SOIC 8, 150 mils

CASE 751BD−01

ISSUE O

E1 E

PIN # 1

IDENTIFICATION

TOP VIEW

SIDE VIEW END VIEW

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MS-012.

SYMBOL MIN NOM MAX

0º 8º

0.10

0.33

0.19

0.25

4.80

5.80

3.80

1.27 BSC

1.75

0.25

0.51

0.25

0.50

5.00

6.20

4.00

L0.40 1.27

1.35

ASM3P2182A

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Table 8. ORDERING INFORMATION

Part Number Marking Package Type Temperature

ASM3P2182AF−08TT 3P2182AF 8−Pin TSSOP, TUBE, Pb Free Commercial

ASM3P2182AF−08TR 3P2182AF 8−Pin TSSOP, TAPE & REEL, Pb Free Commercial

ASM3P2182AF−08ST 3P2182AF 8−Pin SOIC, TUBE, Pb Free Commercial

ASM3P2182AF−08SR 3P2182AF 8−Pin SOIC, TAPE & REEL, Pb Free Commercial

ASM3P2182A−08TT 3P2182A 8−Pin TSSOP, TUBE Commercial

ASM3P2182A−08TR 3P2182A 8−Pin TSSOP, TAPE & REEL Commercial

ASM3P2182A−08ST 3P2182A 8−Pin SOIC, TUBE Commercial

ASM3P2182A−08SR 3P2182A 8−Pin SOIC, TAPE & REEL Commercial

ASM3P2182AG−08TT 3P2182AG 8−Pin TSSOP, TUBE, Green Commercial

ASM3P2182AG−08TR 3P2182AG 8−Pin TSSOP, TAPE & REEL, Green Commercial

ASM3P2182AG−08ST 3P2182AG 8−Pin SOIC, TUBE, Green Commercial

ASM3P2182AG−08SR 3P2182AG 8−Pin SOIC, TAPE & REEL, Green Commercial

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

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ASM3P2182A/D

PUBLICATION ORDERING INFORMATION

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USA/Canada

Europe, Middle East and Africa Technical Support:

Phone: 421 33 790 2910

Japan Customer Focus Center

Phone: 81−3−5773−3850

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