P1708C

Features:

·FCC approved method of EMI attenuation.
·Generates a low EMI spread spectrum clock of the input frequency.
·Optimized for frequency range from 50 to 110MHz.
·Internal loop filter minimizes external components and board space.
·Four selectable spread ranges.
·Low inherent cycle-to-cycle jitter.
·3.3V operating voltage range.
·TTL or CMOS compatible inputs and outputs.
·Ultra-low power CMOS design.
·8.46 mA @3.3V, 54MHz
·9.79 mA @3.3V, 65MHz
·12.06 mA @3.3V, 81MHz
·16.51 mA @3.3V, 108MHz
·Supports notebook VGA and other LCD timing controller applications.
·Pinout compatible to ICS MK1708 and Cypress CY25560.


Application

·The P1708C is targeted towards notebook LCD displays, and other displays using an LVDS interface, PC peripheral devices, and embedded systems.


Pinout




Specifications

Symbol	Parameter	Rating	Unit
VDD, VIN	Voltage on any pin with respect to GND	-0.5 to + 7.0	V
TSTG	Storage temperature	-65 to +125
TA	Operating temperature	0 to 70
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability.

Description

The P1708C is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies.

The P1708C reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P1708C 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 P1708C 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 P1708C uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method.