ICS8430-71B ICST [Integrated Circuit Systems], ICS8430-71B Datasheet - Page 13

• Manufacturer Part Number: ICS8430-71B
• Description: 700MHZ, LOW JITTER, CRYSTAL INTERFACE / LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
• Manufacturer: ICST [Integrated Circuit Systems]

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
/