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P2779A Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer P2779A
Beschreibung Low-Cost Notebook EMI Reduction IC
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 7 Seiten
P2779A Datasheet, Funktion
P2779A
Product Preview
Low-Cost Notebook EMI
Reduction IC
Product Description
The P2779A is a versatile spread spectrum frequency modulator
designed specifically for mobile and digital camera and other digital
video and imaging applications. The P2779A reduces electromagnetic
interference (EMI) at the clock source, which provides systemwide
reduction of EMI of all clock dependent signals. The P2779A allows
significant system cost savings by reducing the number of circuit
board layers and shielding that are traditionally required to pass EMI
regulations.
The P2779A uses the most efficient and optimized modulation
profile approved by the FCC.
The P2779A 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 narrowband signal
produced by oscillators and most frequency generators. Lowering
EMI by increasing a signal’s bandwidth is called spread spectrum
clock generation.
Applications
The P2779A is targeted toward mobile 3D graphics chip set
applications.
Features
Provides up to 15 dB of EMI Suppression
FCC Approved Method of EMI Attenuation
Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
Operates between 20 MHz and 38 MHz Input Frequency Range
External Loop Filter for Spread Percentage Adjustment
Spreading Ranges from ±0.25% to ±2.5%
Ultra Low CycletoCycle Jitter
ZeroCycle Slip at Small Deviations
3.3 V Operating Voltage
Low Power CMOS Design
Available in 8pin SOIC and TSSOP Packages
Available in Industrial Temperature Operating Range
(40°C to +85°C)
These are PbFree Devices
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
SOIC8
S SUFFIX
CASE 751BD
TSSOP8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
XIN / CLKIN
VDD
XOUT
PD
P2779A
REF
ModOUT
LF VSS
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
August, 2011 Rev. P2
1
Publication Order Number:
P2779A/D






P2779A Datasheet, Funktion
PIN # 1
IDENTIFICATION
TOP VIEW
P2779A
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD01
ISSUE O
E1 E
SYMBOL
A
A1
b
c
D
E
E1
e
h
L
θ
MIN
1.35
0.10
0.33
0.19
4.80
5.80
3.80
0.25
0.40
NOM
1.27 BSC
MAX
1.75
0.25
0.51
0.25
5.00
6.20
4.00
0.50
1.27
D
A1
A
eb
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
h
θ
L
END VIEW
c
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