ICS8430-71B ICST [Integrated Circuit Systems], ICS8430-71B Datasheet - Page 13
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ICS8430-71B
Manufacturer Part Number
ICS8430-71B
Description
700MHZ, LOW JITTER, CRYSTAL INTERFACE / LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
Manufacturer
ICST [Integrated Circuit Systems]
Datasheet
1.ICS8430-71B.pdf
(16 pages)
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 6.
T
voltage of V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(V
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
8430BY -71
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
•
•
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CCO_MAX
CCO_MAX
CCO
- 2V.
Integrated
Circuit
Systems, Inc.
– (V
– (V
- V
- V
CCO_MAX
OH_MAX
OL_MAX
CCO_MAX
OUT
OUT
) = 1.7V
) = 0.9V
= V
- 2V))/R
- 2V))/R
= V
OL_MAX
OH_MAX
F
L
L
] * (V
IGURE
= V
] * (V
= V
CCO_MAX
CCO_MAX
CCO_MAX
CCO_MAX
6. LVPECL D
www.icst.com/products/hiperclocks.html
PRELIMINARY
– 1.7V
- V
– 0.9V
LVCMOS-
- V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
V
Q1
CCO
RIVER
13
TO
C
700MH
IRCUIT AND
CCO_MAX
-3.3V LVPECL F
CCO_MAX
- V
- V
R L
V
Z
50
OL_MAX
T
OH_MAX
CCO
, L
ERMINATION
V
- 2V
OUT
OW
)) /R
)) /R
L
] * (V
L
J
] * (V
ITTER
CCO_MAX
CCO_MAX
REQUENCY
, C
ICS8430B-71
- V
- V
RYSTAL
OL_MAX
OH_MAX
) =
REV. A SEPTEMBER 20, 2005
) =
S
YNTHESIZER
I
NTERFACE
/