AFBR-0544Z Evaluation Kit for the AFBR-5972Z Fiber Optic Transceiver Application Note 5532 Evaluation Board Application Note Outline The AFBR-0544Z evaluation board gives the system 1. Evaluation kit designer a convenient means to evalute the performance 2. Evaluation PCB description of the Avago AFBR-5972Z fiber optic transceiver module, 3. Electro-optical test configurations as well as future compatible products. 4. Evaluation board schematic and bill of materials As shown in Figure 1, the evaluation board is mounted with (BOM) an AFBR-5972Z module, four SMA connectors for differen - tial input/output signals, a 2-pin header for measuring RF 1. Evaluation kit differential signals using a differential probe, and three 2 The AFBR-0544Z evaluation kit includes: mm jacks for the 3.3 V supply voltage and signal detect (a) Evaluation board with AFBR-5972Z module, four (SD). SMA connectors, 2-pin header and three 2 mm jack This application note describes the evaluation printed connectors and electronic components mounted on circuit board (PCB), the test equipment, and the methods bottom side of PCB for evaluating optical and electrical characteristics of the (b) 1 m simplex POF cable (NA = 0.5) the AFBR-5972Z transceiver module. - P/No. HFBR-RNS001Z (c) AFBR-4526Z duplex connector for AFBR-5972Z (d) 1 m POF, with two AFBR-4526Z duplex connectors - P/No. HFBR-RSD001Z (To demonstrate only the mechanical properties of the duplex connector) Not included in the evaluation kit are: (a) 3.3 V DC power supply and power supply cables (b) Digitial multimeter (c) MPI 1632C Digital Data Analyzer (Pattern generator) (d) SDA 600A serial data analyzer (Oscilloscope) Figure 1. Evaluation board for the AFBR-5972Z transceiver module (e) Femto (O/E) converter (f) Differential probe2. Evaluation Board Description The evaluation board schematic is shown in Figure 2. The differential LVDS or LVPECL electrical inputs signal of the transmitter are AC coupled through 100nF capacitors and connected by 50 transmission lines to SMA connectors. The differential LVPECL electrical outputs from LVPECL ter - mination of the receiver are AC coupled through 100nF capacitors and connected by 50 transmission lines to SMA connecters. The signal detect (SD) pin is LVPECL com- patible. The thick line between SMA connector and the input/output pins of AFBR-5972Z represents a 50 trans- mission in the schematics (Figure 2). The top and bottom- sides of the evalution PCB are shown in Figure 3(a) and 3(b) respectively. The evaluation board is a two-layer PCB designed for 125 Mbit/s. The transceiver differential lines are placed below the ground plane (top side) to ensure a low inductance signal return path and continuous impedance along the trace. The ground plane under/around the transceiver helps the tranceiver dissipate thermal energy. A 1.57 mm PCB thickness is used so that the AFBR-5972Z mounting Figure 3(a). Top side of the AFBR-0544Z evaluation board clip can be fitted properly. For best transceiver perfor - mance, the decoupling capacitor and ferrite bead should be placed as close as possible to the tranceiver supply voltage, as shown in Figure 3(b). Table 1 describes the input/output interface.The input/ output interface is shown on the top side of the evalua- tion board. Figure 3(b). Bottom side of the AFBR-0544Z evaluation board Table 1. Input/output description Name Description Signal Level TD+ Differential transmitter inputs LVDS, LVPECL TD- RD+ Differential receiver outputs LVPECL Figure 2. Schematic of the AFBR-0544Z evaluation board RD- SD Signal detect DP Differential receiver output signal for differential probe measurement 3V3 Transmitter and receiver power supply 3.3 V GND Transmitter and receiver ground GND 2