Checkpoint LAB USB-RS232 Instrukcja Użytkownika Pobierz pdf (Strona 17)

NOISE IMMUNITY

DECOUPLING CAPACITORS

• Know your performance response needs.

• Try to eliminate frequencies outside your performance needs

(i.e. filtering, smooth out spikes in DC power of IC’s).

• Digital Isolation Caps:

• Common practice is to isolate digital IC’s with isolation

capacitors. See manufacturer’s Spec Sheet for capacitor

values. Be sure to add to your schematic prior to Design

Review.

STEP 6 HARNESSES

ANALYSIS HARNESS SIGNAL RESPONSE

Research you max data rate, distance, noise, parasitic

capacitance, reflections, distortion spec, etc.

Frequency Response for both: Digital rise time to support data

rate and if analog max frequency and distortion needs.

• DC to 100 khz Open Wire

• DC to 40 MB/s Ribbon Cable (less than 3’)

• SCSI, SPI-3 applications

• DC to 300 mhz Twisted Pair - unshielded, ribbon

• DC to 100/1000 MB/s ethernet Cat 5 minimum

spec. RJ45 connector.

• Coax, VHF 3000 megahz (scope probe, cable

TV) attenuation, reflectance, Cable TV, Rf

• DC to 4 gigahz Fiber Optics

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Checkpoint LAB USB-RS232 Instrukcja Użytkownika Strona 17