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PACS1284

IEEE 1284 ECP/EPP Termination Network

California Micro Devices Corp 

PACS1284

Performance Information

Filter Capacitors

Figure 1 shows typical insertion loss graphs for the

PACS1284, for Data and Strobe signals. The curves

are dependent on the physical location of the filter ele-

ments with respect to the ground and VCC terminals of

the device.

These graphs are measured in a 50 Ohm environment.

The signal is introduced at the series resistor input and

the output is measured at the corresponding filter

capacitor.

The three plotted lines in Figure 1 depict the following

measurements:

• Line labeled "A" is measured between pin 14

(input) and pin 16 (output).

• Line labeled "B" is measured between pin 3 (input)

and pin 26 (output).

• Line labeled "C" is measured between pin 6 (input)

and pin 23 (output).

The "A" graph depicts “worst case” filter performance,

while "C" represents a “best case” situation. Graphs of

all other filter elements will fall between these two. (The

filter insertion loss was measured using a Hewlett

Packard HP8753C Analyzer.)

SS2112 in dB

0

-10

A

-20

B

-30

C

-40

-50

300 450 600 750 900 1050 1200

(FREQUENCY, MHz)

Figure 1. Typical Filter Insertion Loss for PACS1284 (S21 in dB, TA=25°C)

© 2004 California Micro Devices Corp. All rights reserved.

4 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214

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06/07/04

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