100 Base-X Interface Module ELECTRONICS INC. EPF8048G EPF8048G • Optimized to work with ML6692/94 PHY chip • • Guaranteed to operate with 8 mA DC bias at 70°C on cable side • • Complies with or exceeds IEEE 802.3, 100 BX Standards • • Robust construction allows for most severe soldering processes • Electrical Parameters @ 25° C Insertion Loss (dB Max.) OCL @ 70°C Return Loss (dB Min.) 1-100 MHz 100 KHz, 0.1 Vrms 8 mA DC Bias Cable Side Xmit Rcv 350µH -1 -1 • 1-60 MHz 60-80 MHz Xmit Rcv Xmit Rcv -18 -18 -12 -12 80-100 MHz Xmit -10 Common Mode Rejection (dB Min.) Crosstalk (dB Min.) [Between Channels] 100-200 MHz 10-100 MHz 30-100 MHz Rcv Xmit Rcv Xmit -10 -40 -40 -30 200-500 MHz Rcv Xmit Rcv -30 Isolation : 1500 Vrms • Cable Impedance : 100 Ω • Rise Time : 3.0 nS Max. • -25 -40 -25 *Optional • Schematic Transmit Channel 1 Receive Channel 16 8 7 2 15 14 2CT:1CT 3 9 10 11 1CT:1CT 12 Dimensions Package A J Pin 1 I.D. N PCA EPF8048G Date Code B Pad Layout Q D M E C K L H PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 P F Dim. Min. A B C D E F G H I J K L M N P Q .970 .380 .223 .700 .003 .100 .500 .016 .008 .090 0° .025 (Inches) Max. Nom. .990 .400 .243 Typ. .020 Typ. .520 .022 .012 Typ. 8° .045 (Millimeters) Min. Max. Nom. 24.64 9.65 5.66 17.78 0.076 2.54 12.7 .406 .203 2.28 0° .635 .030 .100 .092 .560 25.15 10.16 6.17 Typ. .508 Typ. 13.20 .559 .305 Typ. 8° 1.14 .762 2.54 2.34 14.22 I G CSF8048Ga Rev. 1 1/7/97 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 100 Base-X Interface Module ELECTRONICS INC. EPF8048G The circuit below is a guideline for interconnecting PCA’s EPF8048G with ML6692 or ML6694 chip 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 100 BX protocol. 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. Note that in the 100 BX application, you do not need a split primary. The reason is that there is no 10 Base T to negotiate. The receiver side can be terminated as shown or by a single 100 ohms with primary center tap taken to ground via a suitible cap.Note that in the 100 BX application, you do not need a split primary. The reason is that there is no 10 Base-T to negotiate. The receiver side can be terminated as shown or by a single 100 ohms with primary center tap taken to ground via a suitible cap. NOTE THAT THIS PART DOES NOT HAVE A TRANSMIT CHANNEL CENTER TAP ON THE CABLE SIDE. Sufficient common mode attenuation is provided by the high performance common mode chokes on chip side as well as the cable side thus making this part easy to manufacture at reduced costs. A proper system board design may allow some users to benefit from this simplified structure of the transmit channel. 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 EPF8048G. 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 +5V 1 Xmit 2 8 200Ω 200Ω 3 7 3 Rcv 6 9 TX+ 1 TX- 2 10 RJ45* 50Ω 14 16 RX- 15 50Ω RX+ 50Ω ML6692 or ML6694 4 5 50Ω 7 8 EPF8048G .1 µF Chassis Ground Capacitor Notes : * NIC Side is shown. Hub side connection will swap pins 3-6 with 1-2. PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CSF8048Gb Rev. 1 1/7/97 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com