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PDF ICS843051 Data sheet ( Hoja de datos )
| Número de pieza | ICS843051 | |
| Descripción | FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
ICS843051
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS843051 is a Gb Ethernet Generator and a
member of the HiPerClocksTM family of high
HiPerClockS™ performance devices from ICS.The ICS843051 can
synthesize 10 Gigabit Ethernet, SONET, or Serial
ATA reference clock frequencies with the
appropriate choice of crystal and output divider.The ICS843051
has excellent phase jitter performance and is packaged in a
small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
FEATURES
• 1 differential 3.3V LVPECL output
• Crystal oscillator interface designed for
18pF parallel resonant crystals
• RMS phase jitter at:
155.52MHz (12KHz - 20MHz): 0.74ps (typical)
156.25MHz (1.875MHz - 20MHz): 0.43ps (typical)
161.13MHz (1.933MHz - 20MHz): 0.43ps (typical)
• RMS phase noise at 156.25MHz
Offset
Noise Power
100Hz .................. -95 dBc/Hz
1KHz ................ -110 dBc/Hz
10KHz ................ -125 dBc/Hz
100KHz ................ -125 dBc/Hz
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Lead-Free package fully RoHS compliant
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FREQUENCY TABLE
Inputs
Crystal Frequency (MHz)
20.141601
20.141601
19.53125
19.53125
19.44
19.44
18.75
18.75
FREQ_SEL
0
1
0
1
0
1
0
1
Output Frequency
(MHz)
161.132812
80.566406
156.25
78.125
155.52
77.76
150
75
PIN ASSIGNMENT
VCCA
VEE
XTAL_OUT
XTAL_IN
1
2
3
4
8 VCC
7 Q0
6 nQ0
5 FREQ_SEL
ICS843051
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
BLOCK DIAGRAM
XTAL_IN
XTAL_OUT
OSC
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843051AG
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Phase
Detector
VCO
FREQ_SEL
0 ÷4 (default)
1 ÷8
÷32
(fixed)
www.icst.com/products/hiperclocks.html
1
nQ0
Q0
REV. A DECEMBER 14, 2004
1 page  
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et4U.com
Integrated
Circuit
Systems, Inc.
ICS843051
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 155.52MHZ
Filter
155.52MHz
RMS Phase Noise Jitter
12KHz to 20MHz = 0.74ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
a Filter to raw data
1k
10k 100k 1M
10M 100M
DOatFaFSSEhTeeFtR4EUQ.UcEoNmCY (HZ)
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843051AG
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0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 156.25MHZ
Gb Ethernet Filter
156.25MHz
RMS Phase Noise Jitter
1.875MHz to 20MHz = 0.43ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Gb Ethernet Filter to raw data
1k
10k 100k 1M
10M
OFFSET FREQUENCY (HZ)
www.icst.com/products/hiperclocks.html
5
100M
REV. A DECEMBER 14, 2004
5 Page 
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Integrated
Circuit
Systems, Inc.
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 4.
VCC
ICS843051
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
Q1
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VOUT
RL
50
VCC - 2V
FIGURE 4. LVPECL DRIVER CIRCUIT AND TERMINATION
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DataShee
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
voltage of V - 2V.
CC
• For logic high, V = V = V – 0.9V
OUT
OH_MAX
CC_MAX
(V - V ) = 0.9V
CCO_MAX OH_MAX
• For logic low, V = V = V – 1.7V
OUT
OL_MAX
CC_MAX
(V - V ) = 1.7V
CCO_MAX OL_MAX
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
– (V - 2V))/R ] * (V - V ) = [(2V - (V
- V ))/R ] * (V - V ) =
OH_MAX
CC_MAX
L CC_MAX OH_MAX
CC_MAX
OH_MAX
L
CC_MAX OH_MAX
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(V – (V - 2V))/R ] * (V
- V ) = [(2V - (V
- V ))/R ] * (V - V ) =
OL_MAX
CC_MAX
L CC_MAX OL_MAX
CC_MAX
OL_MAX
L
CC_MAX OL_MAX
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
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843051AG
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www.icst.com/products/hiperclocks.html
11
REV. A DECEMBER 14, 2004
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| PDF Descargar | [ Datasheet ICS843051.PDF ] | |
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