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ICS91719 Datasheet

  • ICS91719

  • Low EMI, Spread Modulating, Clock Generator

  • 10頁(yè)

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS91719
Low EMI, Spread Modulating, Clock Generator
Features:
鈥?/div>
ICS91719 is a Spread Spectrum Clock targeted for
Mobile PC and LCD panel applications. Generates an
EMI optimized clock signal (EMI peak reduction of 7-
14 dB on 3rd-19th harmonics) through use of Spread
Spectrum techniques.
鈥?/div>
ICS91719 focuses on the lower input frequency
range of 14.318 to 80.00 MHz with a spread
modulation of 20kHz to 40kHz.
Specifications:
鈥?/div>
Supply Voltages: VDD = 3.3V 鹵0.3V
鈥?/div>
Frequency range: 14.318 MHz
鈮?/div>
Fin
鈮?/div>
80 MHz
鈥?/div>
Cyc to Cyc jitter: <150ps
鈥?/div>
Output duty cycle 40/60% (worst case)
鈥?/div>
Guarantees +85擄C operational condition.
鈥?/div>
16-pin TSSOP package 4.4mm body (173mils), 0.65
mm pitch
鈥?/div>
14.318 MHz crystal input or reference clock input
鈥?/div>
27MHz, 48MHz and 66MHz reference clock input
Pin Configuration
GND
X1 _CLKIN
X2
GNDA
VDDA
VDD
GND
* * CLKOUT/FS_IN0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDDREF
VDDREF_SEL_2.5V/3.3V# ^
REF_OUT/VDDREF_SEL_1.8V * *
**REF_Stop
^PD#
SCLK
SDATA
^SPREAD_ENABLE/FS_IN1
16-pin TSSOP
Notes:
** Internal pull-down
^ Internal pull-up
Input Select Functionality
FS_IN1 FS_IN0 MHZ
0
0
1
1
0
1
0
1
14.318 in 27.00 out
14.318 in/out
27.00 in/out
48.00 in/out
66.66 in/out
Default Spread %
-0.8% downspread
-0.8% downspread
-0.8% downspread
-0.8% downspread
Block Diagram
REFOUT
CLKIN
PLL1
Spread
Spectrum
Spectrum
CLKOUT
CLKOUT
REF Voltage Select Functionality
Pin14
0
0
1
1
Pin15
0
1
0
1
REF Voltage
N/A
1.8V
2.5V
3.3V
SPREAD#
PD#
REF_STOP
SDAT
SD A
SCLK
FS_IN0:1
Control
Logic
Config.
Reg.
0506D鈥?8/16/04

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