© 2000 California Micro Devices Corp. All rights reserved.

4/00

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

1

CALIFORNIA MICRO DEVICES

PACAC

P/ACTIVE AC TERMINATION NETWORK

Features

• High Frequency Performance

• Miniature QSOP Package

• 18 terminating lines/package

• Stable resistor-capacitor network

SCHEMATIC CONFIGURATION

Product Description

Note: CAMD’s P/Active AC Integrated Resistor-Capacitor Termination Network is an upgraded version of the original

PRC202/212 series. PACAC provides 2KV ESD protection, minimized lead inductance and parasitic capacitive effects

(with added ground pins), improved termination characteristics, and frequency response at high data transmission rates.

The PACAC is recommended for all new designs.

This integrated thin film resistor-capacitor network is designed to eliminate transmission line effects on high speed data

lines. Incorporating CAMD’s P/Active AC Integrated Resistor-Capacitor Termination Network will result in improved board

yields and reliability, minimized space and routing problems on the board, and reduced assembly costs. This highly

integrated network requires no DC power dissipation.

Why P/Active termination networks? A terminating RC is used to reduce or eliminate reflections on a transmission line. It

can perform this function only when its impedance value matches the characteristic impedance of the transmission line across a

broad frequency spectrum.

Passive components affect the electrical performance of electronic systems. In reality, every resistor has some parasitic

series inductance and a parasitic capacitance; and every capacitor has both series resistance and inductance. At low

speeds, these parasitics do not affect the performance of resistors and capacitors. However, at higher speeds, these

parasitics cause mismatch in a termination. To prevent these problems in high speed digital designs, a designer must take

special care in selecting passive components or networks.

The PACAC family of devices provides consistent and predictable behavior over a higher frequency range than discrete

components or any previous network products.

*Maximum frequency where the real part of the impedance of the AC

termination is within 10% tolerance of the designed resistance R.

20

21

22

23

24

19 18

17

16 15 14

13

12

345

6

7

8

9

10

12

11

Refer to AP-201 Termination Application Note for

further information.

Applications

• AC Termination

• Low Pass Filtering

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