P1707A Datasheet, PDF (1/6 Pages) Alliance Semiconductor Corporation – Notebook LCD Panel EMI Reduction IC

P1707A
Notebook LCD Panel EMI
Reduction IC
Description
The P1707A is a versatile spread spectrum frequency modulator
designed specifically for input clock frequencies. The P1707A
reduces electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of down stream clock and data
dependent signals. The P1707A 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 P1707A 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.’
The P1707A uses the most efficient and optimized modulation
profile approved by the FCC and is implemented in a proprietary all
digital method.
Applications
The P1707A is targeted towards notebook LCD displays, and other
displays using an LVDS interface, PC peripheral devices, and
embedded systems.
Features
• FCC Approved Method of EMI Attenuation
• Generates a Low EMI Spread Spectrum Clock of the Input
Frequency
• Optimized for Frequency Range from 40 MHz to 175 MHz
• Internal Loop Filter Minimizes External Components and Board
Space
• Four Selectable Spread Ranges
• Low Inherent Cycle−to−Cycle Jitter
• 3.3 V Operating Voltage
• Ultra−low Power CMOS Design
− 14.85 mA @ 3.3 V, 140 MHz
− 16.69 mA @ 3.3 V, 162 MHz
− 17.78 mA @ 3.3 V, 175 MHz
• Supports Notebook VGA and Other LCD Timing Controller
Applications
• Pinout Compatible to ICS MK1707 and Cypress CY25561 /
CY25560
• SSON / SBM Pin for Spread Spectrum On/Off and Standby Mode
Controls
• Available in 8−pin SOIC and TSSOP Packages
• These are Pb−Free Devices
http://onsemi.com
SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
CLKIN
NC
VDD
SR0
VSS
SR1
ModOUT
SSON/SBM
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 − Rev. 3
Publication Order Number:
P1707A/D