NB3N51032

www.onsemi.com

9

APPLICATION INFORMATION

Crystal Input Interface

Figure 7 shows the NB3N51032 device crystal oscillator

interface using a typical parallel resonant crystal. The device

crystal connections should include pads for small capacitors

from X1 to ground and from X2 to ground. These capacitors,

board and are used to match the nominally required crystal

as nominal values, assuming approximately 2 pF of stray

capacitance per trace and approximately 8 pF of internal

capacitance.

The frequency accuracy and duty cycle skew can be

frequency.

Figure 7. Crystal Interface Loading

X1

X2

Fundamental Mode

Parallel Resonant Crystal

18 pF Load

Power Supply Filter

In order to isolate the NB3N51032 from system power

supply, noise decoupling is required. The 10

mF and a 0.1 mF

cap from supply pins to GND decoupling capacitor has to be

and 13). It is recommended to place decoupling capacitors

as close as possible to the device to minimize lead

inductance.

Termination

The output buffer structure is shown in the Figure 8.

Figure 8. Simplified Output Structure

CLKx

CLKx

IREF

2.6 mA

475

W

HCSL / LVDS

termination

14 mA