10/100 Base-X Module for QSI 6611/6612 Multi-Port Applications ELECTRONICS INC. EPF8050S • Also recommended for Broadcom BCM5208 10/100 Solution • • Significantly improved common mode attenuation • • 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 Return Loss (dB Min.) 80-100 MHz 150 MHz 1-10 MHz 20-30 MHz Crosstalk (dB Min.) Common Mode Rejection (dB Min.) 40-60 MHz 70-100 MHz 30-100 MHz 200 MHz 300 MHz 500 MHz 0.1-100 MHz Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv -1 350µH -1 -1 -1 • -3 -3 -18 -18 -14 -18 -10 -18 -8 -10 -30 -25 -25 -20 -20 -10 -15 --- -30 Impedance : 100 Ω • Rise Time : 3.0 nS Max. Isolation : 1500 Vrms • Schematic Receive Channel 1:1 1, 6, 11, 16 2, 7, 12, 17 Transmit Channel 2 CT:1CT 3, 8, 13, 18 39, 34, 29, 24 5, 10, 15, 20 36, 31, 26, 21 4, 9, 14, 19 37, 32, 27, 22 Chip Side Chip Side Media Side Media Side Dimensions Package A N J PCA EPF8050S Date Code B Q 40 21 P Solder Pad Layout 1 20 D M I K C F H E 38, 33, 28, 23 40, 35, 30, 25 Dim. Min. A B C D E F G H I J K L M N P Q 1.110 .470 .235 .950 .008 .050 .620 .016 .008 .085 0° .045 (Inches) Max. Nom. (Millimeters) Min. Max. Nom. 28.19 28.70 11.94 12.45 5.97 6.48 24.13 Typ. .203 .305 1.27 Typ. 15.75.. 16.00 406 .559 .203 .305 2.16 Typ. 0° 8° 1.14 Typ. 1.130 .490 .255 Typ. .012 Typ. .630 .022 .012 Typ. 8° Typ. .030 .050 .090 .670 .762 1.27 2.29 17.02 L G PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSF8050Sa Rev. Orig. 3/6/97 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 QSI 6611/6612 Multi-Port Applications ELECTRONICS INC. EPF8050S The circuit below is a guideline for interconnecting PCA’s EPF8050S with QSI6611 and QSI6612 chip set for 10.100 Mb/s applications. Further details can be obtained from the chip manufacturer application notes. 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. It is recommended that system designers do not use the receiver side center tap to ground, via a capacitor. This may worsen EMI, specifically if the secondary “common mode termination” is pulled to chassis ground as shown. 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. The “common mode termination” load of 75Ω shown from the center taps of the secondary may be taken to chassis ground via a cap of suitable value. This depends upon user’s design, EMI margin etc. 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 EPF8050S. 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. QSI6611 or QSI6612 40 1 39 2 38 3 36 6 Rcv RC +5V R R Typical Application Circuit for UTP TX+ 3 TX- 5 4 75Ω 50Ω 4 Xmit RJ45* 37 5 RX+ 25Ω RX- 1 50Ω 7 2 25Ω 25Ω 25Ω EPF8050S High Voltage Capacitor 8 Node Pinout Chassis Ground CM Capacitor R = 80 suggested Notes : R = 80Ω suggested; RC typical 39Ω. Consult QSI for update. * NIC Side is shown. Hub side connection will have crossover swapping pins 3-6 & PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSF8050Sb Rev. Orig. 3/6/97 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com