CALIFORNIA MICRO DEVICES
PACAC
Applications
AC Termination
Low Pass Filtering
Refer to AP-201 Termination Application Note for
further information.
P/ACTIVE AC TERMINATION NETWORK
Features
High Frequency Performance
Miniature QSOP Package
18 terminating lines/package
Stable resistor-capacitor network
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.
Absolute Tolerance (R)
Absolute Tolerance (C)
Operating Temperature Range
Crosstalk (See Text Circuit)
Power Rating/Resistor
ESD Clamp
Positive Clamp
Negative Clamp
ESD Protection
(per MIL-STD -833, Method 3015)
Storage Temperature
Package Power Rating
STANDARD SPECIFICATIONS
±10%
±10%
0°C to 70°C
<5% (typical)
100mW
>6V
<-6V
SCHEMATIC CONFIGURATION
24 23 22
21 20 19 18
17 16 15 14 13
>2KV
-60°C to 150°C
1.00W, max.
1
2
3
4
5
6
7
8
9
10 11 12
STANDARD
VALUES
fmax* @
Time
R(
Ω)
C(pf)
R±10% Constant (ns)
33
47
47
75
10 0
47
47
33
50
100
1
1
1
1
1
GH z
GH z
GH z
GH z
GH z
1.55
2.21
1.55
3.75
10.0
RC Code
330/470
470/470
470/330
750/500
101/101
*Maximum frequency where the real part of the impedance of the AC
termination is within 10% tolerance of the designed resistance R.
© 2000 California Micro Devices Corp. All rights reserved.
4/00
C0840400
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
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