EPE6138A Card ASIC solutions requiring predistortion (similar AT&

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EPE6138A Card ASIC solutions requiring predistortion (similar AT&

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Base-T Card Module with Integrated Predistortion Resistors
EPE6138A
Card ASIC solutions requiring predistortion (similar AT&T T7240) Robust design allows toughest soldering processes Complies with exceeds IEEE 802.3, Base-T Requirements
Electrical Parameters
Cut-off Frequency (MHz) Xmit Insertion Loss Max.) 1-10 Xmit Return Loss Min.) 5-10 Xmit Xmit Attenuation Min.) Xmit Xmit Xmit Xmit Common Mode Rejection Min.) Xmit Xmit Crosstalk Min.)
1-10 Xmit
Isolation meets exceeds 802.3 IEEE Requirements Characteristic Filter Impedance ohms *Excluding resistor networks
Transmit Channel
68.1
Schematic
49.9
Receive Channel
49.9
68.1
Media Side
Chip Side
Chip Side Media Side
Package
I.D. EPE6138A Date Code Dim. Min. .780 .510 .074 .600 .003 .100 .650 .016 .010 .100 .030
Dimensions
(Inches) Max. Nom. .800 .530 .084 Typ. .010 Typ. .670 .020 Typ. Typ. .050 .030 .200 .085 .700 (Millimeters) Min. Max. Nom. 19.81 12.95 1.88 15.24 .076 2.54 16.51 .406 .254 2.54 .762 20.32 13.46 2.13 Typ. .254 Typ. 17.02 .508 Typ. Typ. 1.27 .762 5.08 2.16 17.78
Layout
ELECTRONICS, INC. 16799 SCHOENBORN NORTH HILLS, 91343
CSE6138Aa Rev. 1/7/97
Product performance limited specified parameters. Data subject change without prior notice.
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com
Base-T Card Module with Integrated Predistortion Resistors
EPE6138A
circuit below guideline interconnecting PCA's EPE6138A with ASICS Base-T chip over cable. Further details system design, such chip pin-out, etc. obtained from Card specific chip manufacturer. Typical insertion loss isolation transformer/filter 0.7dB. This parameter covers entire spectrum encoded signals Base-T protocols. However, predistortion resistor network introduces some loss which taken into account determining well your design meets Standard Template requirements. Thevenin's equivalent termination impedance provided transmitt outputs 2*(287//68.1) ohms approx. ohms. Thus, bench testing return loss will assume output impedance less than ohms each driver outpust. Note that some systems have auto polarity detection some not. not, certain follow proper polarity. recommended that system designers ground chip side center taps voltage capacitor. Taking cable side center taps chassis capacitors, recommended, this will cost without containing EMI. This worsen EMI, specifically primary "common mode termination" pulled ground shown. pulldown resistors used around RJ45 connector have been known suppress unwanted radiation that unused wires pick from immediate environment. Their placement considered carefully before design finalized. recommended that there neat separation ground planes layout. generally accepted practice limit plane least 0.08 inches away from chip side pins EPE6138A. There need ground plane beyond this point. best results, designer should design outgoing traces preferably ohms, balanced well coupled achieve minimum radiation from these traces.
Typical Application Circuit Card
TXd+
RJ45
TXASIC CARD TXdPHY
EPE6138A
RXChassis Ground
ELECTRONICS, INC. 16799 SCHOENBORN NORTH HILLS, 91343
CSE6138Ab Rev. 1/7/97
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com

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