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Número de pieza | ICS843301I-108 | |
Descripción | 2.5V LVPECL 75MHZ FREQUENCY SYNTHESIZER W/SSC | |
Fabricantes | Integrated Device Technology | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de ICS843301I-108 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
No Preview Available ! PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL
75MHZ FREQUENCY SYNTHESIZER W/SSC
ICS843301I-108
GENERAL DESCRIPTION
The ICS843301I-108 is a 75MHz Frequency
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high perfor mance devices from IDT.
The ICS843301I-108 uses a 20MHz crystal to
synthesize 75MHz output. The device supports
0.5% downspread spread spectrum clocking. The ICS843301I-
108 has excellent <1ps phase jitter performance, over an
integration range of 900kHz - 7.5MHz. The device is packaged
in a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
FEATURES
• One differential 3.3V or 2.5V LVPECL output
• Crystal oscillator interface designed for 20MHz,
18pF parallel resonant crystal
• Output frequency: 75MHz
• Supports SSC, 0.5% downspread
• RMS phase jitter @ 75MHz, using a 20MHz crystal
(900kHz - 7.5MHz): 0.73ps (typical)
• Full 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
SSC FUNCTION TABLE
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SSC
0 (default)
1
Mode
SSC Off
0.5% Downspread
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL_IN
XTAL_OUT
20MHz
OSC
SSC Pulldown
Phase
Detector
VCO
600MHz
PLL
N Div
÷8
M Div
÷30
VCCA 1
8 VCC
VEE 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 SSC
nQ
ICS843301I-108
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 1
ICS843301BGI-108 REV. A OCTOBER 9, 2007
1 page ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PARAMETER MEASUREMENT INFORMATION
PRELIMINARY
2V
2V
VCC
VCCA
LVPECL
VEE
-1.3V ± 0.165V
SCOPE
Qx
nQx
3.3V OUTPUT LOAD AC TEST CIRCUIT
2V
2V
VCC
VCCA
LVPECL
VEE
-0.5V ± 0.125V
SCOPE
Qx
nQx
2.5V OUTPUT LOAD AC TEST CIRCUIT
VOH
VREF
1σ contains 68.26% of all measurements
2σ contains 95.4% of all measurements
3σ contains 99.73% of all measurements
4σ contains 99.99366% of all measurements
6σ contains (100-1.973x10-7)% of all measurements
Reference Point
(Trigger Edge)
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Histogram
Mean Period
(First edge after trigger)
VOL
Clock 20%
Outputs
80%
tR
PERIOD JITTER
OUTPUT RISE/FALL TIME
80%
tF
VSW I N G
20%
nQ
Q
t PW
t
PERIOD
odc = t PW x 100%
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
IDT™ / ICS™ 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 5
ICS843301BGI-108 REV. A OCTOBER 9, 2007
5 Page ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
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 7.
VCC
PRELIMINARY
Q1
VOUT
RL
50Ω
VCC - 2V
FIGURE 7. LVPECL DRIVER CIRCUIT AND TERMINATION
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
CCO_MAX
(V - V ) = 0.9V
CC_MAX
OH_MAX
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• For logic low, V = V = V – 1.7V
OUT
OL_MAX
CC_MAX
(V - V ) = 1.7V
CC_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
IDT™ / ICS™ 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 11
ICS843301BGI-108 REV. A OCTOBER 9, 2007
11 Page |
Páginas | Total 15 Páginas | |
PDF Descargar | [ Datasheet ICS843301I-108.PDF ] |
Número de pieza | Descripción | Fabricantes |
ICS843301I-108 | 2.5V LVPECL 75MHZ FREQUENCY SYNTHESIZER W/SSC | Integrated Device Technology |
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