ICS8745BYI REVISION D JUNE 11, 2009

10

©2009 Integrated Device Technology, Inc.

ICS8745BI Data Sheet

1:5 DIFFERENTIAL-TO-LVDS ZERO DELAY CLOCK GENERATOR

Application Information

Power Supply Filtering Technique

As in any high speed analog circuitry, the power supply pins are

vulnerable to random noise. To achieve optimum jitter performance,

power supply isolation is required. The ICS8745BI provides separate

power supplies to isolate any high switching noise from the outputs

connected to the power supply plane through vias, and 0.01µF

bypass capacitors should be used for each pin. Figure 1 illustrates

additional 10

Ω resistor along with a 10µF bypass capacitor be

Figure 1. Power Supply Filtering

Wiring the Differential Input to Accept Single Ended Levels

Figure 2 shows how the differential input can be wired to accept

generated by the bias resistors R1, R2 and C1. This bias circuit

should be located as close as possible to the input pin. The ratio of

R1 and R2 might need to be adjusted to position the V_REF in the

center of the input voltage swing. For example, if the input clock swing

0.609.

Figure 2. Single-Ended Signal Driving Differential Input

3.3V

10

Ω

10µF

.01µF

.01µF

V_REF

Single Ended Clock Input

CLKx

nCLKx

R1

1K

C1

0.1u

R2

1K