10/100 Base-X Module for Multi-Port Applications ELECTRONICS INC. EPF8061SM • Recommended for DP83840A/DP83223(A), ICS1890 & TSC78Q2120 • • Significantly improved common mode attenuation • • Transfer molded part with improved lead integrity for SMD processing • • Guaranteed to operate with 8 mA DC bias at 70°C • • Complies with or exceeds IEEE 802.3, 10 BT/100 BX Standards • Electrical Parameters @ 25° C Insertion Loss (dB Max.) OCL @ 70°C 100 KHz, 0.1 Vrms 8 mA DC Bias Media Side 0.1-80 MHz 80-100 MHz Return Loss (dB Min.) 150 MHz 1-30 MHz Common Mode Rejection (dB Min.) 30-60 MHz 100 MHz 30-100 MHz 200-300 MHz Crosstalk (dB Min.) [Between Channels] 400-500 MHz 0.1-60 MHz 100 MHz -35 -30 Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv 350µH -1 -1 -1 • -1 -2 -2 -18 Isolation : 1500 Vrms • -18 -18 -18 -10 -10 -40 -40 -30 -20 Impedance : 100 Ω • Rise Time : 3.0 nS Max. -20 -15 • Schematic Receive Channel Transmit Channel 6, 16 35, 25 2, 12 39, 29 7, 17 34, 24 3, 13 38, 28 33, 23 4, 14 Media Side Chip Side 8, 18 Chip Side 37, 27 1 CT:1CT 1 CT:1CT Media Side Dimensions Package A N J Pin 1 I.D. PCA EPF8061SM Date Code B Q 40 21 P Solder Pad Layout 1 20 D M Dim. Min. A B C D E F G H I J K L M N P Q 1.110 .470 .235 .950 .010 .050 .590 .016 .008 .085 0° .025 (Inches) Max. Nom. (Millimeters) Min. Max. Nom. 28.19 11.94 5.97 24.13 .254 1.27 14.97 .203 2.16 0° .635 1.130 .490 .255 Typ. .015 Typ. .610 .022 .012 Typ. 8° .045 .030 .050 .090 .670 28.70 12.45 6.48 Typ. .381 Typ. 15.49 .559 .305 Typ. 8° 1.14 .762 1.27 2.29 17.02 K C F H E L I G PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSF8061SMa Rev. 3 11/10/97 Product performance is limited to specified parameters. Data is subject to change without prior notice. TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com 10/100 Base-X Module for Multi-Port Applications ELECTRONICS INC. EPF8061SM The circuit below is a guideline for interconnecting PCA’s EPF8061SM with ICS 1890 chip for 10/100 Mb/s applications. Further details can be obtained from the chip manufacturer application notes. Connection to the alternative chips such as TSC 78Q2120 or DP83840A/DP83223(A) is straight forward; please consult appropriate data sheet recommendations for completing this project. Typical insertion loss of the isolation transformer is 0.5dB. This parameter covers the entire spectrum of the encoded signals in 10/100 protocols. Under terminated conditions, to transmit a 2V pk-pk signal across the cable, you must adjust the chips supporting resistor to get at least 2.12V pk-pk across the transmit pins. Primary side center taps can be returned to the chip side ground plane; but more often than not, if the ground plane is itself noisy, field experience has shown that it may worsen EMI situation. It is perhaps wiser to carefully lay the system borad so that substantial gain in EMI suppression is obtained from the so called “common mode termination” on the cable side as shown below. In any event, this configuration has been known to be quite successful in the field in EMI containment for similar applications. The phantom resistors shown around the 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 0.05 inches away from the chip side pins of EPF8061SM. There need not be any ground plane beyond this plane. For best results, PCB designer should design the outgoing traces preferably to be 50 Ω, balanced and well coupled to achieve minimum radiation from these traces. Typical Application Circuit for UTP (only one port shown) 5Vcc 35 1 33 2 3 2 37 6 TX- 4 34 RX+ 6 38 RX- 8 49.9Ω 39 TX+ 49.9Ω ICS 1890 49.9Ω 49.9Ω 3 Rcv Xmit RJ45* 75Ω 75Ω 4 5 75Ω 7 7 8 EPF8061SM High Voltage Capacitor CM Capacitor Chassis Ground Notes : Only one port shown for Hub side connection. PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSF8061SMb Rev. 3 11/10/97 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com