10 Base-T Interface Module ELECTRONICS INC. EPE6199S • Optimized for Level One LXT905 • • Two pairs of TX and RX in 40 pin SOIC package • • Robust design allows for toughest soldering process • • Complies with or exceeds IEEE 802.3, 10 Base-T Requirements • Electrical Parameters @ 25° C Group Delay (nS Max.) Insertion Loss (dB Max.) Return Loss (dB Min.) 5-10 MHz 1-10 MHz 5-10 MHz Attenuation (dB Min.) (1) @ 25 MHz Common Mode Rejection (dB Min.) @ 30 MHz @ 40 MHz @ 50 MHz Crosstalk (dB Min.) @ 100 MHz Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv 3 --- -1 -1 -15 -15 -10 --- -20 --- -30 --- -30 -30 -25 -25 @ 1-10 MHz -30 Isolation : meets or exceeds 802.3 IEEE Requirements • Characteristic Filter Impedance : 100 Ω • (1) Referenced @ 5 MHz response. • Schematic Transmit Channel Receive Channel 1,11 40,29 1:2 2,12 39,28 12.4Ω LPF 3,13 1:1 8,18 34,23 100Ω 38,27 12.4Ω 9,19 33,22 10,20 Package A Dimensions (J) N R PCA EPF6199S Date Code B Q 40 21 Solder Pad Layout 1 P 20 S M D I K C F H E L G PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSE6199Sa Rev.- Dim. Min. A B C D E F G H I (J) K L M N P Q R S 1.105 .470 .200 .950 .005 .050 .620 .016 .008 .083 0° .025 .200 .250 (Inches) Max. Nom. 1.125 .490 .220 Typ. .015 Typ. .640 .022. .012 Typ. 8° .045 Typ. Typ. (Millimeters) Min. Max. Nom. 28.67 11.94 5.08 24.13 .127 1.27 15.75 .406 .203 2.10 0° .635 .030 .050 .090 .670 2 plcs 2 plcs 6/5/97 Product performance is limited to specified parameters. Data is subject to change without prior notice. 5.08 6.35 28.58 12.45 5.59 Typ. .381 Typ. 16.26 .559 .305 Typ. 8° 1.14 Typ. Typ. .762 1.27 2.29 17.02 2 plcs 2 plcs TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com 10 Base-T Interface Module ELECTRONICS INC. EPE6199S The circuit below is a guideline for interconnecting PCA’s EPE6199S with LXT905 10 Base-T PHY chip over UTP cable. Further details of system design, such as chip pin-out, etc. can be obtained from the specific chip manufacturer. Typical insertion loss of the isolation transformer is 0.7dB. This parameter covers the entire spectrum of the encoded signals in 10 Base-T protocols. However, the predistortion resistor network introduces some loss which has to be taken into account in determining how well your design meets the Standard Template requirements. Additionally, the following need to be considered while selecting resistor values : a. Each channel needs 100Ω termination, thus the Thevenin’s equivalent resistance seen by a channel looking into the transmit outputs from the chip must be equal to a value close to 100Ω. The LXT 905 driver output impedances are very low. . Thus only 11.8Ω on TPON & TPOP are enough to provide a balanced 25 Ω termination given that turns ratio is 1:2. Following these guidelines will guarantee that the return loss specifications are satisfied at all extremes of cable impedance (i.e. 85Ω to 115Ω) while the module is installed in your system. The receiver channel termination is rather straight forward: two 50Ω loads provide the balanced termination to the cable. b. That the template requirements are satisfied under the worst case Vcc (i.e. 4.5V), will impose a further constraint on resistor selection, in that they ought to be the minimum derived from the calculations. Users can allow for pads on their PCB for a shunting resistor across pins 6 and 8 of EPE6199S for more flexibility in setting voltage levels at the outputs. Note that some systems have auto polarity detection and some do not. If not, be certain to follow the proper polarity. The pulldown resistors used around the RJ45 connector have been known to suppress unwanted radiation that unused wires pick up from the immediate environment. Their placement and use are to be considered carefully before a design is finalized. It is recommended that there be a neat separation of ground planes in the layout. It is generally accepted practice to limit the plane off at least 0.08 inches away from the chip side pins of EPE6199S. There need not be any ground plane beyond this point. For best results, PCB designer should design the outgoing traces preferably to be 50Ω, balanced and well coupled to achieve minimum radiation from these traces. Typical Application Circuit for UTP for one port only. 9 TPIN 10 LXT905 PHY EPE6199S 8 TPIP 39 3 38 6 34 1 33 2 TX+ TX- RJ45* RX+ RX4 3 2 5 7 8 1 TPON TPOP 0.1µF X7R 0.1µF X7R High voltage cap, if used 2KV recommended Chassis Ground Notes : * Pin-outs shown are for Hubs and Repeaters. PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSE6199Sb Rev. - 6/5/97 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com