853013AM

www.icst.com/products/hiperclocks.html

REV. A OCTOBER 19, 2005

13

Integrated

Circuit

Systems, Inc.

ICS853013

3. Calculations and Equations.

LVPECL output driver circuit and termination are shown in Figure 5.

Ω load, and a termination

voltage of V

CCO

- 2V.

•

For logic high, V

OUT

= V

OH_MAX

= V

CCO_MAX

– 0.935V

(V

CC_MAX

- V

OH_MAX

) = 0.935V

•

For logic low, V

OUT

= V

OL_MAX

= V

CCO_MAX

– 1.67V

(V

CCO_MAX

- V

OL_MAX

) = 1.67V

Pd_H = [(V

OH_MAX

– (V

CCO_MAX

- 2V))/R

L

] * (V

CCO_MAX

- V

OH_MAX

) = [(2V - (V

CCO_MAX

- V

OH_MAX

))/R

L

] * (V

CCO _MAX

- V

OH_MAX

) =

[(2V - 0.935V)/50

Ω] * 0.935V = 19.92mW

Pd_L = [(V

OL_MAX

– (V

CCO_MAX

- 2V))/R

L

] * (V

CCO_MAX

- V

OL_MAX

) = [(2V - (V

CCO_MAX

- V

OL_MAX

))/R

L

] * (V

CCO_MAX

- V

OL_MAX

) =

[(2V - 1.67V)/50

Ω] * 1.67V = 11.02mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30.94mW

Figure 5. LVPECL Driver Circuit and Termination

VCCO - 2V

Q1

VOUT

RL

50

VCCO