ICS91720 Datasheet, PDF (1/11 Pages) Integrated Circuit Systems – Low EMI, Spread Modulating, Clock Generator

Integrated
Circuit
Systems, Inc.
ICS91720
Low EMI, Spread Modulating, Clock Generator
Features:
Pin Configuration
• ICS91720 is a Spread Spectrum Clock targeted for
Mobile PC and LCD panel applications that
CLKIN 1
8 PD#*
generates an EMI-optimized clock signal (EMI peak
VDD 2
7 SCLK
reduction of 7-14 dB on 3rd-19th harmonics) through
GND 3
use of Spread Spectrum techniques.
**CLKOUT/FS_IN0 4
• ICS91720 focuses on the lower input frequency
6 SDATA
5 REF_OUT/FS_IN1*
range of 14.318 to 80.00 MHz with a spread
modulation of 20kHz to 40kHz.
8 Pin SOIC/TSSOP
* Internal Pull-Up Resistor
Specifications:
** Internal Pull-Down Resistor
• Supply Voltages: VDD = 3.3V ±0.3V
• Frequency range: 14.318 MHz ≤ Fin ≥ 80 MHz
• Cyc to Cyc jitter: <150ps
• Output duty cycle 45-55%
• Guarantees +85°C operational condition.
• 8-pin SOIC/TSSOP
• Reference input
Functionality
FSIN_1 FSIN_0
MHz
0
0 14.318 MHz in --> 27MHz out
0
1 14.318MHz -->14.318MHz out
1
0 27.00MHz in --> 27.00MHz out
1
1 48.00MHz in -->48.00 MHz out
Spread % default
-0.8 down spread
-1.00 down spread
-1.25 down spread
-0.8 down spread
Block Diagram
CLKIN
PLL1
Spread
Spectrum
REFOUT
CLKOUT
PD#
SDATA
SCLK
FS_IN0:1
Control
Logic
Config.
Reg.
0698D—10/05/04