ASM3P2183A-08TR - ON Semiconductor L.L.C.

August, 2011 − Rev. 3

1Publication Order Number:

ASM3P2183A/D

ASM3P2183A

EMI Reduction IC

Description

The ASM3P2183A is a versatile spread spectrum frequency

modulator designed specifically for a wide range of input clock

frequencies from 6 MHz to 90 MHz. (Refer to Input Frequency and

Modulation Rate Table). The ASM3P2183A can generate an EMI

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

ASM3P2183A offers a Down Spread clock with a percentage

deviation of −1.25% and a Center Spread clock with a percentage

deviation of ± 0.42%.

The ASM3P2183A reduces electromagnetic interference (EMI) at

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

stream clock and data dependent signals. The ASM3P2183A 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 ASM3P2183A uses the most efficient and optimized

modulation profile approved by the FCC and is implemented in a

proprietary all digital method.

The ASM3P2183A 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 ASM3P2183A 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: 6 MHz to 90 MHz

•Internal Loop Filter Minimizes External Components and Board

Space

•Selectable Spread Options: Down and Center Spread

•2 Spread Frequency Deviation Selections: −1.25% or ± 0.42%

•Low Inherent Cycle−to−Cycle Jitter

•Supply Voltage: 3.3 V ± 0.3 V

•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

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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

XOUT

VSS

XIN / CLKIN

SS%

TSSOP−8

T SUFFIX

CASE 948AL

ASM3P2183A

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Figure 1. Block Diagram

ModOUT

PLL

XIN/CLKIN

Crystal

Oscillator

VSS

SS%

VDD

FS0 FS1

VCO Output

Divider

Loop

Filter

Phase

Detector

Modulation

Frequency

Divider

Feedback

Divider

XOUT

Table 1. PIN DESCRIPTION

Pin# Pin Name Type Description

1XIN / CLKIN ICrystal connection or external frequency input. This pin has dual functions. It can be con-

nected to either an external crystal or an external reference clock.

2 XOUT I Crystal connection. Input connection for an external crystal. If using an external reference,

this pin must be left unconnected.

3 VSS PGround to entire chip.

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

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

5 ModOUT O Spread spectrum low EMI output.

6 VDD PPower supply for the entire chip.

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 6 MHz to 13 MHz

0 1 12 MHz to 25 MHz

1 0 25 MHz to 50 MHz

1 1 50 MHz to 90 MHz

Table 3. SPREAD DEVIATION SELECTION TABLE

SS% (pin 4) Spread Deviation (%)

0− 1.25

1± 0.42

ASM3P2183A

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Table 4. ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Rating Unit

VDD, VIN Voltage on any pin with respect to Ground −0.5 to +4.6 V

TSTG Storage temperature −65 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

Symbol Parameter Min Typ Max Unit

TAOperating Temperature 0 +70 °C

VDD Core Voltage +3.0 +3.3 +3.6 V

Table 6. DC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit

VIL Input low voltage VSS − 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

IXOL XOUT Output low current

(@ 0.4 V, VDD = 3.3 V)

−3−mA

IXOH XOUT Output high current

(@ 2.5 V, VDD = 3.3 V)

−3−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, 90 MHz and 10 pF loading)

−28 −mA

IDD Static supply current (Note 1) −7.0 −mA

VDD Operating voltage 3.0 3.3 3.6 V

tON Power up time (first locked clock cycle after power up) −0.18 −mS

ZOUT Clock out impedance −50 −W

1. XIN /CLKIN pin is pulled low.

Table 7. AC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit

fIN Input frequency 6−90 MHz

ModOUT Output frequency 6−90 MHz

tLH (Note 2) Output rise time (measured at 0.8 V to 2.0 V) 0.3 0.9 1.1 nS

tHL (Note 2) Output fall time (measured at 2.0 V to 0.8 V) 0.5 1.0 1.2 nS

tJC Jitter (cycle to cycle) − − 200 pS

TDOutput duty cycle 45 50 55 %

2. tLH and tHL are measured with a capacitive load of 15 pF at 27 MHz.

ASM3P2183A

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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

ASM3P2183A

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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

ASM3P2183A

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Table 8. ORDERING INFORMATION

Part Number Marking Package Type Temperature

ASM3P2183A−08ST 3P2183A 8−Pin SOIC, TUBE Commercial

ASM3P2183A−08SR 3P2183A 8−Pin SOIC, TAPE & REEL Commercial

ASM3P2183A−08TT 3P2183A 8−Pin TSSOP, TUBE Commercial

ASM3P2183A−08TR 3P2183A 8−Pin TSSOP, TAPE & REEL Commercial

ASM3P2183AF−08ST 3P2183AF 8−Pin SOIC, TUBE, Pb Free Commercial

ASM3P2183AF−08SR 3P2183AF 8−Pin SOIC, TAPE & REEL, Pb Free Commercial

ASM3P2183AF−08TT 3P2183AF 8−Pin TSSOP, TUBE, Pb Free Commercial

ASM3P2183AF−08TR 3P2183AF 8−Pin TSSOP, TAPE & REEL, Pb Free Commercial

ASM3P2183AG−08ST 3P2183AG 8−Pin SOIC, TUBE, Green Commercial

ASM3P2183AG−08SR 3P2183AG 8−Pin SOIC, TAPE & REEL, Green Commercial

ASM3P2183AG−08TT 3P2183AG 8−Pin TSSOP, TUBE, Green Commercial

ASM3P2183AG−08TR 3P2183AG 8−Pin TSSOP, TAPE & REEL, Green Commercial

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ASM3P2183A/D

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