CGS700V datasheet(5/6 Pages) NSC

5 / 6 page

CGS700 (Continued)

Note 1

trise and tfall parameters are measured at the pin of the device

Note 2

Skew is measured at 50% of VCC for CLK1 and CLK2 while it is measured

14V for CLK4 Limits are guaranteed by design

Note 3

Output duty cycle is measured at VDD 2 for CLK1 and CLK2 while it is measured

14V for CLK4 Limits are guaranteed by design

Note 4

Jitter parameter is characterized and is guaranteed by design only It measures the uncertainty of either the positive or the negative edge over 1000

cycles It is also measured at output levels of VCC 2 Refer to Figure 2 for further explanation

Note 5

The GNDA pins of the 700 must be as free of noise as possible for minimum jitter Separate analog ground plane is recommended for the PCB

Also the VCCA pin requires extra filtering to further reduce noise Ferrite beads for filtering and bypass capacitors are suggested for VCCA pin

TLF11955 – 5

TLF11955 – 6

TLF11955 – 7

FIGURE 1 Waveforms

TLF11955 – 8

Jitter e

lPeriod(1) b Period(na1)l e 300 ps for either the rising or falling edge where n is 1 to 1000 cycles

FIGURE 2 Jitter

Application References and Bibliography

Information relating to EMI as well as general application issues are in the following application notes

AN-988EMI App Note

AN-640

AN-991

http

www nationalcom

CGS700V Datasheet(PDF) 5 Page - National Semiconductor (TI)