ICS84427 Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – CRYSTAL-TO-LVDS INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84427
CRYSTAL-TO-LVDS
INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER
GENERAL DESCRIPTION
The ICS84427 is a Crystal-to-LVDS Frequency
ICS
Synthesizer/Fanout Buffer and a member of the
HiPerClockS™ _{HiPerClockS™ family of High Performance Clock}
Solutions from ICS. The output frequency can be
programmed using the frequency select pins. The
low phase noise characteristics of the ICS84427 make it an
ideal clock source for 10 Gigabit Ethernet, 10 Gigabit Fibre
Channel, OC3 and OC12 applications.
FUNCTION TABLE
Inputs
F_XTAL MR F_SEL2 F_SEL1
X
1
X
X
19.44MHz 0
1
0
19.44MHz 0
1
0
19.44MHz 0
1
1
19.44MHz 0
1
1
25MHz 0
0
0
25MHz 0
0
0
25MHz 0
0
1
25MHz 0
0
1
25.5MHz 0
0
0
F_SEL0
X
0
1
0
1
0
1
0
1
1
Output
Frequency
F_OUT
LOW
77.76MHz
155.52MHz
311.04MHz
622.08MHz
78.125MHz
156.25MHz
312.5 MHz
625MHz
159.375MHz
FEATURES
• Six LVDS outputs
• Crystal oscillator interface
• Output frequency range: 77.76MHz to 625MHz
• Crystal input frequency: 19.44MHz, 25MHz or 25.5MHz
• RMS phase jitter at 155.52MHz, using a 19.44MHz crystal
(12kHz to 20MHz): 3.4ps (typical)
Phase noise:
Offset
Noise Power
100Hz ................. -95 dBc/Hz
1kHz ............... -110 dBc/Hz
10kHz ............... -120 dBc/Hz
100kHz ............... -121 dBc/Hz
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Available in both standard and lead-free RoHS-compliant
packages
BLOCK DIAGRAM
XTAL_IN
XTAL_OUT
OSC
PLL
0
Output
/^{6 Q0:Q5}
1
Divider
/^{6 nQ0:nQ5}
Feedback
Divider
F_SEL2 MR PLL_SEL F_SEL1
F_SEL0
PIN ASSIGNMENT
Q0 1
nQ0 2
Q1 3
nQ1 4
Q2 5
nQ2 6
Q3 7
nQ3 8
Q4 9
nQ4 10
Q5 11
nQ5 12
24 VDD
23 F_SEL0
22 F_SEL1
21 MR
20 XTAL_IN
19 XTAL_OUT
18 F_SEL2
17 VDDA
16 VDD
15 PLL_SEL
14 GND
13 VDD
ICS84427
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm body package
M Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
84427CM
www.icst.com/products/hiperclocks.html
REV. D NOVEMBER 30, 2005
1