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PDF P2784 Data sheet ( Hoja de datos )

Número de pieza P2784
Descripción General Purpose EMI Reduction IC
Fabricantes Alliance Semiconductor 
Logotipo Alliance Semiconductor Logotipo



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No Preview Available ! P2784 Hoja de datos, Descripción, Manual

July 2005
P2781/82/84
rev 1.5
General Purpose EMI Reduction IC
Features
ƒ Provides up to 15dB of EMI suppression
ƒ FCC approved method of EMI attenuation
ƒ Generates a 1X, 2X, and 4X low EMI spread
spectrum clock of the input frequency
ƒ Input frequency range from 3 to 78MHz
ƒ External loop filter for spread % adjustment
ƒ Spreading ranges from ±0.25% to ±5.0%
ƒ Ultra low cycle-to-cycle jitter
ƒ Zero-cycle slip
ƒ 3.3V operating voltage range
ƒ 10 mA output drives
ƒ TTL or CMOS compatible outputs
ƒ Ultra-low power CMOS design
ƒ P278XA is available in 8 pin SOIC and TSSOP
Packages
ƒ Available for industrial and automotive
temperature ranges.
Product Description
other digital video and imaging applications. The P278xA
reduces electromagnetic interference (EMI) at the clock
source, which provides system wide reduction of EMI of
all clock dependent signals. The P278xA allows
significant system cost savings by reducing the number of
circuit board layers and shielding that are traditionally
required to pass EMI regulations.
The P278xA uses the most efficient and optimized
modulation profile approved by the FCC. The P278xA
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 P278xA is a versatile spread spectrum frequency
modulator designed specifically for digital camera and
The P278xA is targeted towards MFP, xDSL, fax modem,
set-top box, USB controller, DSC, and embedded systems.
Block Diagram
FS0 FS1 LF
VDD
XIN /CLKIN
XOUT
Crystal
Oscillator
www.DataSheet4U.com
Frequency
Divider
Feedback
Divider
Modulation
PLL
Phase
Detector
VCO
Output
Divider
ModOUT
VSS
Alliance Semiconductor
2575, Augustine Drive Santa Clara, CA 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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P2784 pdf
July 2005
P2781/82/84
rev 1.5
Absolute Maximum Ratings
Symbol
VDD
VI
VO
IIK
IOK
TS
TA
TJ
Parameter
Supply voltage, DC
Input voltage, DC
Output voltage, DC
Input clamp current (VI<0 or VI>VDD)
Output clamp current (VI<0 or VI>VDD)
Storage temperature
Ambient temperature range, under bias
Junction temperature
Lead temperature (soldering 10 sec)
Input static discharge voltage protection
(As per JEDEC STD22- A114-B)
Rating
(VSS – 0.5) to 7
(VSS-0.5) to (VDD+0.5)
(VSS-0.5) to (VDD + 0.5)
-50 to +50
-50 to +50
-65 to +125
-55 to 125
150
260
2
Unit
V
V
V
mA
mA
°C
°C
°C
°C
kV
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device
reliability.
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)
Symbol
Parameter
VIL Input low voltage
VIH Input high voltage
IIL
Input low current
(internal input pull-up resistor on FS0 and FS1)
IIH
Input high current
(internal input pull-up resistor on FS0 and FS1)
IXOL XOUT output low current
IXOH XOUT output high current
VOL Output low voltage (VDD = 3.3V, IOL = 20mA)
Min
VSS – 0.3
2.0
-
-
-
-
-
Typ
-
-
60
60
10
10
-
Max
0.8
VDD +0.3
-
-
-
-
0.4
Unit
V
V
µA
µA
mA
mA
V
VOH
IDD
ICC
VDD
Output high voltage (VDD = 3.3V, IOH = 20mA)
Static supply current
Typical dynamic supply current
(25pF scope probe loading)
Operating voltage
2.5
-
5.2 at 3MHz
3.0
- -V
3 - mA
- 21.2 at 82MHz mA
3.3 3.6 V
www.DataSheet4U.com
General Purpose EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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P2784 arduino
July 2005
rev 1.5
P2781/82/84
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
Fax: 408-855-4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: P2781/82/84
Document Version: 1.5
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003
© 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).
www.DAaltlasSahleest4oUf A.clolimance 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.
General Purpose EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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