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| 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% 0C to 70C <5% (typical) 100mW >6V <-6V SCHEMATIC CONFIGURATION 24 23 22 21 20 19 18 17 16 15 14 13 >2KV -60C to 150C 1.00W, max. 1 2 3 4 5 6 7 8 9 10 11 12 STANDARD VALUES fmax* @ Time R() C(pf) R10% 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. (c) 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 CALIFORNIA MICRO DEVICES PACAC RC Code 330/470 470/470 470/330 750/500 101/101 Package Pins 24 24 24 24 24 STANDARD PART ORDE RING INFORMATION Ordering Part Number Style Tubes Tape & Reel Part Marking QSOP QSOP QSOP QSOP QSOP PAC330/470AQ/T PAC470/470AQ/T PAC470/330AQ/T PAC750/500AQ/T PAC101/101AQ/T PAC330/470AQ/R PAC470/470AQ/R PAC470/330AQ/R PAC750/500AQ/R PAC101/101AQ/R PAC330/470ACQ PAC470/470ACQ PAC470/330ACQ PAC750/500ACQ PAC101/101ACQ Crosstalk Test Circuit (TA=25OC) 1 2 3 4 5 6 Pulse Generator 0 to 5 volt 10 MHz > 1ns Rise/Fall Time 24 23 22 21 20 19 18 17 16 15 14 13 To Victim Line 50 Victim Voltage Test Point 7 To All Terminations Except Victim Line 8 9 10 11 12 (c)2000 California Micro Devices Corp. All rights reserved. 2 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 4/00 |
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