Datasheet P1818, P1819, P1820, P1821, P1822 Datasheet (Alliance Semiconductor)

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查询I1818A-08SR供应商

Production March 2003

Features

Low Power Mobile VGA EMI Reduction IC

P1818/19/20/21/22

• FCC approved method of EMI attenuation

• Provides up to 15 dB EMI reduction

• Generates a low EMI spread spectrum clock and a non-spread reference clock of the input frequency

• Optimized for frequency range from 10 MHz to 160 MHz

P1818: 10 to 20 MHz P1819: 20 to 40 MHz P1820: 40 to 80 MHz P1821: 10 to 40 MHz P1822: 80 to 160 MHz

• Internal loop filter minimizes external components and board space

Product Description

The P18xx is a versatile spread spectrum frequency modulator designed specifically for a wide range of input clock frequencies from 10 to 160 MHz (see Input Frequency and Modulation Rate Selections). The P18xx can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The P18xx-A to P18xx-H offer various combinations of spread options and percentage deviations (see Spread Deviation Selections). These combinations include Down Spread, Center Spread and percentage deviation range from ±0.625% to -3.50%.

The P18xx reduces electromagnetic interference (EMI) at the clock source, allowing a system wide EMI reduction for all the down stream clocks and data dependent signals. The P18xx 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.

• Selectable spread options: Down Spread and Center Spread

• Low inherent cycle-to-cycle jitter

• Eight spread % selections: +/-0.625% to –3.5%

• 3.3V operating voltage

• CMOS/TTL compatible inputs and outputs

• Low power CMOS design

• Supports notebook VGA and other LCD timing controller applications

• Power down function for mobile application

• Products are available for industrial temperature range.

• Available in 8-pin SOIC and TSSOP

The P18xx 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 P18xx uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method.

Applications

The P18xx is targeted toward 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.

Alliance Semiconductor

2575 Augustine Drive • Santa Clara, CA 95054 • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com

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

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Pin Diagrams

P1818/19/20/21/22

1 8

XIN

VSS

SRS

ModOut

2 7 3 4

XIN VSS D_C

ModOut

Block Diagram

P 1 8 1 8 A /B /C /D P 1 8 1 9 A /B /C /D P 1 8 2 0 A /B /C /D

1 8 2 7 3

P 1 8 1 8 E /F /G /H

P 1 8 1 9 E /F /G /H P 1 8 2 0 E /F /G /H

6 5

XOUT

VDD

PD#

REF

XOUT

VDD

PD#

REF

VSS

SRS

ModOut

VSS

SRS

ModOut

1 8

XIN

2 7 3 4

P 1 8 2 1 A /B /C /D

1 8

XIN

2 7 3 4

P1822A

6 5

XOUT

VDD

FRS

REF

MRS

VDD

SSON#

SR0

XIN

XOUT

Crystal

Oscill a t o r

REF

Frequency

Divider

Feedback

Divider

D_C PD# MRS FRS SRS

Modulation

Phase

Detector

P1818/19/20/21/22 Block Diagram

Loop Filter

VDD

VSS

PLL

VCO

Output Divider

ModOUT

Low Power Mobile VGA EMI Reduction IC

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

2 of 8March 2003

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Input Frequency and Modulation Rate

P1818/19/20/21/22

Part number

P1818 10 MHz to 20 MHz 10 MHz to 20 MHz Input frequency / 256 P1819 20 MHz to 40 MHz 20 MHz to 40 MHz Input frequency / 512 P1820 40 MHz to 80 MHz 40 MHz to 80 MHz Input frequency / 2048

FRS=0 10 MHz to 20 MHz 10 MHz to 20 MHz Input frequency / 256

P1821

FRS=1 20 MHz to 40 MHz 20 MHz to 40 MHz Input frequency / 512

P1822 80 MHz to 160 MHz 80 MHz to 160 MHz Input frequency / 3584

Spread Deviation Selections

Part number

P1818

/19/20/21A

P1818/19/20/21B 0 N/A N/A -1.25% (Down)

P1818/19/20/21C 0 N/A N/A +/-1.25% (Center)

P1818/19/20/21D 0 N/A N/A +/-0.625% (Center)

P1818/19/20E N/A N/A 0 -1.25% (Down)

P1818/19/20F N/A N/A 0 -2.5% (Down)

P1818/19/20G N/A N/A 0 -1.75% (Down)

P1818

P1822A

P1822B

1.A through H represents various combinations of spread deviations, options, and modulation rates.

2. Refer to Frequency vs. Deviation (P1818A and P1818H).

/19/20H

Input

frequency range

Output

frequency range

Modulation rate

SRS SR0 D_C Spread deviation

0 N/A N/A -2.50% (Down) 1 -3.50% (Down)

1 -1.75% (Down)

1 +/-1.75% (Center)

1 +/-0.875% (Center)

1 +/-0.625% (Center)

1 +/-1.25% (Center)

1 +/-0.875% (Center)

N/A N/A 0 -3.5% (Down)

1 +/-1.75% (Center) 0 0 N/A -1.25% (Down) 0 1 -2.50% (Down) 1 0 -1.75% (Down) 1 1 -3.50% (Down) 0 0 N/A +/-0.625% (Center) 0 1 +/-1.25% (Center) 1 0 +/-0.875% (Center) 1 1 +/-1.75% (Center)

Low Power Mobile VGA EMI Reduction IC

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

3 of 8March 2003

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Frequency vs. Deviation (P1818A and P1818H)

Deviation in P1818A Deviation in P181 8H

Frequency

SRS = 1 SRS = 0 D_C = 1 D_C = 0

10 MHz -4.4% -3.3% -4.4% ±2.2% 15 MHz -1.8% -1.26% -1.8% ±0.9% 20 MHz -0.8% -0.6% -0.8% ±0.4%

Pin Description

P1818/19/20/21/22

number

Name Type Description

1 XIN I Connect to externally generated clock signal or crystal. 2 VSS P Ground Connection. Connect to system ground. 3 SRS I Spread Range Select. Digital logic input used to select frequency devi-

ation (see Spread Deviation Selections). This pin has an internal pullup resistor.

D_C I Digital logic input used to select Down (LOW) or Center (HIGH) Spread

Options (see Spread Deviation Selections). This pin has an internal pull-up resistor.

4 ModOut O Spread Spectrum clock output (see Input Frequency and Modulation

Rate Selections and Spread Deviation Selections).

5 REF O Non-modulated reference output clock of the input frequency.

5/6

FRS I Frequency Range Select. Digital logic input used to select input fre-

quency range (see Input Frequency and Modulation Rate Selections). This pin has an internal pull-up resistor.

PD# I Power-Down control pin. Pull LOW to enable Power-Down mode. This

pin has an internal pull-up resistor. 7 VDD P Connect to +3.3V 8 XOUT I Connect to crystal. No connect if externally generated clock signal is

used.

MRS I Modulation Rate Select. Digital logic input used to select Modulation

Rate (see Spread Deviation Selections). This pin has an internal pull-

up resistor.

1. Please refer to Figure 1 for pin assignment.

Low Power Mobile VGA EMI Reduction IC

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4 of 8March 2003

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Absolute Maximum Ratings

Symbol Parameter Rating Unit

P1818/19/20/21/22

, V

STG

Voltage on any pin with respect to GND -0.5 to +7.0 V

Storage temperature -65 to +125 º C Operating temperature 0 to +70 º C

DC Electrical Characteristics

3.3 V, 25° C

Symbol Parameter Min Typ Max Unit

V V

XOL

XOH

Input low voltage GND – 0.3 – 0.8 V

Input high voltage 2.00 – V

Input low current (inputs D_C,

-60.0 – -20.00 µA

+ 0.3 V

PD#, MRS, FRS, SRS)

Input high current – – 1.00 µA

XOUT output low current

(@ 0.4 V, V

= 3.3 V)

XOUT output high current

(@ 2.5 V, V

= 3.3 V)

2.00 – 12.00 mA

––12.00mA

OUT

Output low voltage

=3.3 V, IOL = 20 mA)

Output high voltage

=3.3 V, IOH = 20 mA)

Static supply current

––0.4V

––2.8V

–4.5–mA

Standby mode

Dynamic supply current

Normal mode (3.3 V and 25 pF

7.1

IN-min

–26.9

IN-max

probe loading)

Operating voltage – 3.3 – V

Power up time

–0.18– mS

(first locked clock cycle after

power up)

Clock output impedance – 50 – Ω

Low Power Mobile VGA EMI Reduction IC

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

5 of 8March 2003

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AC Electrical Characteristics

3.3 V, 25° C

Symbol Parameter Min Typ Max Unit

P1818/19/20/21/22

Input frequency 10 – 160 MHz Output frequency 10 – 160 MHz Output rise time

(measured at 0.8 V to 2.0 V) Output fall time

(measured at 2.0 V to 0.8 V) Jitter (cycle to cycle) at 20 MHz -200 – 200 ps

Output duty cycle 45 50 55 %

and tHL are measured into a capacitive load of 15 pF

1. t

OUT

–0.66– ns

–0.65– ns

Low Power Mobile VGA EMI Reduction IC

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6 of 8March 2003

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Mechanical Package Outline (8-Pin SOIC)

P1818/19/20/21/22

Inches Millimeters

Symbol

Min Nor Max Min Nor Max

P18xxx

LOT NUMBER

YYWW

Mechanical Package Outline (8-Pin TSSOP)

A 0.057 0.064 0.071 1.45 1.63 1.80 A1 0.004 0.007 0.010 0.10 0.18 0.25 A2 0.053 0.061 0.069 1.35 1.55 1.75

B 0.012 0.016 0.020 0.31 0.41 0.51

C 0.004 0.006 0.01 0.10 0.15 0.25

D 0.186 0.194 0.202 4.72 4.92 5.12

E 0.148 0.156 0.164 3.75 3.95 4.15

e 0.050 BSC 1.27 BSC

H 0.224 0.236 0.248 5.70 6.00 6.30

L 0.012 0.020 0.028 0.30 0.50 0.70 a 0°5°8°0°5°8°

Note: Controlling dimensions are millimeters. SOIC: 0.074 grams unit weight.

Inches Millimeters

Symbol

Min Nor Max Min Nor Max

A – – 0.047 – – 1.10 A1 0.002 – 0.006 0.05 – 0.15

18xxx

Lot #

YYWW

A2 0.031 0.039 0.041 0.80 1.00 1.05

B 0.007 – 0.012 0.19 – 0.30

C 0.004 – 0.008 0.09 – 0.20

D 0.114 0.118 0.122 2.90 3.00 3.10

E 0.169 0.173 0.177 4.30 4.40 4.50

e 0.026 BSC 0.65 BSC

H 0.244 0.252 0.260 6.20 6.40 6.60

L 0.018 0.024 0.030 0.45 0.60 0.75

a 0° – 8° 0° – 8°

Note: Controlling dimensions are millimeters. TSSOP: 0.034 grams unit weight.

Low Power Mobile VGA EMI Reduction IC

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Ordering Information

X18XXX -08 XX

12345

1. Flow prefix: I = industrial temperature range (-40° C to 85° C) P = commercial temperature range (0° C to 70° C)

2. Device number

3. Deviation (%) and spread option identifier

4. Device pin count

5. Package identifier: ST = SOIC in tube SR = SOIC in tape and reel TT = TSSOP in tube TR = TSSOP in tape and reel

P1818/19/20/21/22

Example:

Ordering

number

Marking

Input

frequency

(MHz)

P1818A-08ST P1818A 10 – 20 -2.5, -3.5 8 PIN SOIC, TUBE 0°C to 70°C P1818A-08SR P1818A 10 – 20 -2.5, -3.5 8 PIN SOIC, TAPE &

P1818A-08TT P1818A 10 – 20 -2.5, -3.5 8 PIN TSSOP, TUBE 0°C to 70°C P1818A-08TR P1818A 10 – 20 -2.5, -3.5 8 PIN TSSOP, TAPE &

1. Products are available for industrial temperature range operation. Please contact factory for more information.

Licensed under U.S. patent numbers 5,488,627 and 5,631,920.

Frequency

deviation

(%)

Package

type

REEL

Qty . /

reel

Temp

2,500 0°C to 70°C

© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights, mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.

Low Power Mobile VGA EMI Reduction IC

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

8 of 8March 2003