ICS8735AM-21 IDT, Integrated Device Technology Inc, ICS8735AM-21 Datasheet - Page 16

• Manufacturer Part Number: ICS8735AM-21
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Zero Delay PLL Clock Generatorr

Specifications of ICS8735AM-21

• Number Of Elements: 1
• Supply Current: 150mA
• Pll Input Freq (min): 31.25MHz
• Pll Input Freq (max): 700MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Package Type: SOIC
• Output Frequency Range: Up to 700MHz
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.465V
• Operating Temperature Classification: Commercial
• Pin Count: 20
• Lead Free Status / Rohs Status: Not Compliant

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.
Figure 7. LVPECL Driver Circuit and Termination
T
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™ / ICS™ 3.3V LVPECL ZERO DELAY CLOCK GENERATOR
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage
ICS8735-21
700MHZ, DIFFERENTIAL-TO-3.3V LVPECL ZERO DELAY CLOCK GENERATOR
CCO
•
•
– 2V.
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CCO_MAX
CCO_MAX
– (V
– (V
– V
– V
CCO_MAX
CCO_MAX
OH_MAX
OUT
OL_MAX
OUT
= V
V
= V
Q1
CCO
) = 1.7V
) = 0.9V
OL_MAX
– 2V))/R
OH_MAX
– 2V))/R
= V
L
= V
L
] * (V
] * (V
CCO_MAX
CCO_MAX
CCO_MAX
CCO_MAX
RL
50Ω
V
CCO
– 1.7V
– 0.9V
-
V
2V
– V
OUT
– V
OL_MAX
OH_MAX
) = [(2V – (V
) = [(2V – (V
16
CCO_MAX
CCO_MAX
– V
– V
OL_MAX
OH_MAX
))/R
))/R
ICS8735AM-21 REV. A JULY 31, 2008
L
] * (V
L
] * (V
CCO_MAX
CCO_MAX
– V
– V
OL_MAX
OH_MAX
) =
) =