ICS650-41 Datasheet, PDF (1/11 Pages) Integrated Circuit Systems – Spread Spectrum Clock Synthesizer

ICS650-41
Spread Spectrum Clock Synthesizer
Description
The ICS650-41 is a spread spectrum clock synthesizer
intended for video projector applications. It generates
an EMI optimized 50 MHz clock signal (EMI peak
reduction of 7 to 14 dB on 3rd through 19th harmonics)
through the use of Spread Spectrum techniques from a
25 MHz crystal or clock input. For the 50 MHz output,
the modulation rate is 50 kHz.
In addition to the EMI optimized clock signal, the device
generates a 48 MHz clock for USB.
Features
• Packaged in 16-pin TSSOP (173 mil)
• Supply voltages: VDD = 3.3 V, VDDO = 2.5 V
• Peak-to-peak jitter: ±125 ps typ
• Output duty cycle 45/55% (worst case)
• Guarantees +85°C operational condition
• 25 MHz crystal or reference clock input
• Zero (0) ppm frequency error on all output clocks
• Advanced, low-power CMOS process
• Industrial temperature range
Block Diagram
25 MHz crystal
or clock input
X1/CLKIN
X2
External capacitors are
required with a crystal
input.
FS3:0
SS_EN
Crystal
OSC
VDD
3
VDDO
PLL1 with
Spread
Spectrum
Control
Logic
PLL2
GND ²
PDTS
50M
48M
MDS 650-41 F
1
Revision 082305
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com