ics8430-111 Integrated Device Technology, ics8430-111 Datasheet - Page 14

• Manufacturer Part Number: ics8430-111
• Description: Programmable Low-jitter Lvpecl Or Lvcmos-input Lvpecl-output 2-output 700-mhz Clock Synthesizer
• Manufacturer: Integrated Device Technology

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.
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
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
IDT
ICS8430-111
700MHZ, LOW JITTER, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
™
•
•
/ ICS
For logic high, V
(V
For logic low, V
(V
™
OL_MAX
3.3V LVPECL FREQUENCY SYNTHESIZER
CCO_MAX
CCO_MAX
OH_MAX
CCO
- 2V.
– (V
– (V
- V
- V
CCO_MAX
OH_MAX
OL_MAX
CCO_MAX
) = 1.7V
) = 0.9V
OUT
- 2V))/R
OUT
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
L
] * (V
] * (V
= V
= V
CCO_MAX
CCO_MAX
CCO_MAX
F
CCO_MAX
IGURE
- V
– 1.7V
- V
– 0.9V
OL_MAX
OH_MAX
6. LVPECL D
) = [(2V - (V
) = [(2V - (V
CCO_MAX
V
CCO_MAX
RIVER
Q1
CCO
14
- V
- V
C
OL_MAX
IRCUIT AND
OH_MAX
)) /R
)) /R
L
] * (V
L
] * (V
R L
V
50
T
CCO
ERMINATION
CCO_MAX
CCO_MAX
V
- 2V
OUT
- V
- V
OL_MAX
OH_MAX
ICS8430DY-111 REV. F JANUARY 29, 2007
) =
) =
PRELIMINARY