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: CAMDs 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 CAMDs 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
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Refer to AP-201 Termination Application Note for
further information.
Applications
AC Termination
Low Pass Filtering
C0840400
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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
2
CALIFORNIA MICRO DEVICES
PACAC
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Pulse Generator
0 to 5 volt
10 MHz
> 1ns Rise/Fall Time
To All
Terminations
Except Victim Line
To Victim
Line
Victim
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Test Point
50
Crosstalk Test Circuit (T
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=25
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