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AFBR-5978Z Datasheet(PDF) 4 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-5978Z Datasheet(HTML) 4 Page - AVAGO TECHNOLOGIES LIMITED |
4 / 14 page 4 Figure 4. Recommended termination circuit. PC Master AFBR-5978Z Protocol IC & SERDES LED driver Amplifier & Tx disable TD+ TD- RD+ RD- Signal Detect Txdis TxVcc Rdata+ Rdata- Sd Sda Scl EEPROM 10nF 10nF 130 130 82 82 4.7k-10k 4.7k-10k V cc 3.3V 82 130 1 µH 1 µH 10 µF 0.1µF 0.1 µF V cc 3.3V 10 µF 0.1 µF V cc 3.3V V cc 3.3V Z = 50 Ω Z = 50 Ω Z = 50 Ω Z = 50 Ω RxVcc Quantisizer Board Layout – Decoupling Circuit and Ground Planes It is important to take care in the layout of your circuit board to achieve optimum performance from the transceiver. A power supply decoupling circuit is recommended to filter out noise to assure optimal product performance. It is further recommended that a contiguous ground plane be provided in the circuit board directly under the transceiver to provide a low inductance ground for signal return current. This recommendation is in keeping with good high frequency board layout practices. Functional Data I/O The LVPECL receiver output of the Avago Technologies transceiver can be DC-coupled to the LVPECL compliant network interface through a Thèvenin equivalent transformation. For a 3.3V power supply the LVPECL outputs should be pulled up to Vcc with a 130 Ω resistor and pulled down to ground with an 82 Ω resistor. Both coupling resistors are preferably placed close to the network interface IC, see figure 4. AC-coupling can be used for systems in which the transceiver and connected logic are at different supply voltages. For AC coupling, the coupling capacitor should be large enough to avoid excessive low-frequency droop when the data signal contains long strings of consecutive identical digits. The LVPECL outputs have to be pulled down to ground first to DC bias the output before AC coupling. Because the LVPECL output common-mode voltage is fixed at Vcc – 1.3V, the DC-biasing resistor can be selected by assuming 14 mA DC current. This results in a bias-resistor value of 142 Ω - 200Ω. After the AC-coupling capacitors, a Thèvenin equivalent transformation connects to the LVPECL compatible network interface, equal to the one used in DC- coupling. |
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