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PDF P2781 Data sheet ( Hoja de datos )

Número de pieza P2781
Descripción General Purpose EMI Reduction IC
Fabricantes PulseCore Semiconductor 
Logotipo PulseCore Semiconductor Logotipo



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No Preview Available ! P2781 Hoja de datos, Descripción, Manual

October 2006
rev 1.6
P2781/82/84
General Purpose EMI Reduction IC
Features
Provides up to 15dB of EMI suppression
FCC approved method of EMI attenuation
Generates a 1X, 2X, and 4X low EMI spread
spectrum clock of the input frequency
Input frequency range from 3 to 78MHz
External loop filter for spread % adjustment
Spreading ranges from ±0.25% to ±5.0%
Ultra low cycle-to-cycle jitter
Zero-cycle slip
3.3V operating voltage range
Ultra-low power CMOS design
P278xA is available in 8 pin SOIC and TSSOP
Packages
Available for industrial and automotive
temperature ranges.
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 result 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.
Product Description
Applications
The P278xA is a versatile spread spectrum frequency
modulator designed specifically for digital camera and
other digital video and imaging applications. The P278xA
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
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.

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P2781 pdf
October 2006
rev 1.6
Absolute Maximum Ratings
P2781/82/84
Symbol
Parameter
Rating
Unit
VDD, VIN
TSTG
TA
Ts
TJ
Voltage on any pin with respect to Ground
Storage temperature
Operating temperature
Max. Soldering Temperature (10 sec)
Junction Temperature
-0.5 to +4.6
-65 to +125
-40 to +85
260
150
V
°C
°C
°C
°C
TDV Static Discharge Voltage
(As per JEDEC STD22- A114-B)
2 KV
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time 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
Min
VSS – 0.3
2.0
-
-
-
-
VOL Output low voltage (VDD = 3.3V, IOL = 20mA)
-
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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P2781 arduino
October 2006
rev 1.6
P2781/82/84
PulseCore Semiconductor Corporation
1715 S. Bascom Avenue Suite 200,
Campbell, CA 95008
Tel # - 408-879-9077
Fax # - 408-879-9018
www.pulsecoresemi.com
Copyright © PulseCore Semiconductor
All Rights Reserved
Part Number: P2781/82/84
Document Version: 1.6
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or
registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their
respective companies. PulseCore reserves the right to make changes to this document and its products at any time without
notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein
represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore 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. PulseCore 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 PulseCore 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 PulseCore’s Terms and Conditions of Sale (which are available from
www.DPautalsSehCeoetr4eU)..cAollmsales of PulseCore products are made exclusively according to PulseCore’s Terms and Conditions of Sale.
The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights,
trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore 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 PulseCore products in such life-supporting systems implies that the
manufacturer assumes all risk of such use and agrees to indemnify PulseCore 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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