ICS843002 Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843002
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843002 is a 2 output LVPECL synthesizer
ICS
optimized to generate Fibre Channel reference
HiPerClockS™ _{clock frequencies and is a member of the}
HiPerClocks^TM family of high performance clock
solutions from ICS. Using a 26.5625MHz, 18pF
parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL[1:0]):
212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz, and
53.125MHz. The ICS843002 uses ICS’ 3^rd generation low
phase noise VCO technology and can achieve 1ps or lower
typical rms phase jitter, easily meeting Fibre Channel jitter
requirements. The ICS843002 is packaged in a small 20-pin
TSSOP package.
FEATURES
• Two 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 212.5MHz,
187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter (637kHz - 10MHz): 0.72ps (typical)
• Typical phase noise at 212.5MHz
Phase noise:
Offset
Noise Power
100Hz ............... -87.7 dBc/Hz
1KHz .............. -111.6 dBc/Hz
10KHz .............. -124.3 dBc/Hz
100KHz .............. -124.3 dBc/Hz
• Full 3.3V supply mode
• Lead-Free package RoHS compliant
• -30°C to 85°C ambient operating temperature
FREQUENCY SELECT FUNCTION TABLE
Input
Frequency
(MHz)
26.5625
F_SEL1
Inputs
F_SEL0
M Divider
Value
N Divider
Value
M/N
Divider Value
Output
Frequency
(MHz)
0
0
24
3
8
212.5
26.5625
0
1
24
4
6
159.375
26.5625
1
0
24
6
4
106.25
26.5625
1
1
24
12
2
53.125
23.4375
0
0
24
3
8
187.5
BLOCK DIAGRAM
F_SEL[1:0] ^Pulldown
nPLL_SEL ^Pulldown
TEST_CLK ^Pulldown
1
26.5625MHz
XTAL_IN
OSC
0
XTAL_OUT
nXTAL_SEL ^Pulldown
2
Phase
Detector
1
VCO
637.5MHz
0
(w/26.5625MHz
Reference)
F_SEL[1:0]
0 0 ÷3
0 1 ÷4
1 0 ÷6
1 1 ÷12
PIN ASSIGNMENT
nc 1
20 VCCO
VCCO 2
19 _Q1
Q0 3 18 nQ1
nQ0 4
17 _VEE
MR 5
16 VCC
nPLL_SEL 6 15 nXTAL_SEL
nc 7 14 TEST_CLK
VCCA 8
13 _{XTAL_IN}
F_SEL0 9 12 XTAL_OUT
VCC 10 11 F_SEL1
ICS843002
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Q0
nQ0
Q1
nQ1
MR ^Pulldown
843002AG
M = 24 (fixed)
www.icst.com/products/hiperclocks.html
1
REV. B MAY 6, 2005