NB4N527SMNEVB Evaluation Board User s Manual for NB4N527S NB4N527SMNEVB Figure 2. Evaluation Board Layup Connecting Power and Ground Planes Top side of the evaluation board has the four surfaces to V , but must be THERMALLY connected to a EE mount test point clips labeled V , V , SMA GND, and sufficient heat conduit such as a thermal plane Exact supply CC EE DUT GND. DUT GND is connected to the exposed flag of voltage values that need to be applied can be found in the QFN package. For proper operation, the exposed flag is Table 1 and Figures 4 and 5. recommended to be ELECTRICALLY left floating or tied Table 1. Power Supply Levels Power Supply Span V V SMA GND DUT GND CC EE 3.0 V 1.75 V 1.25 V 0 V Float or V EE 3.3 V 2.05 V 1.25 V 0 V Float or V EE 3.6 V 2.35 V 1.25 V 0 V Float or V EE Stimulus (Generator) Termination For the LVDS configuration, V pin pads of the D0 or TDx All ECL outputs need to be terminated to V (V = V D1 input has to be shorted to form 100 across differential TT TT CC 2.0 V = GND) via a 50 resistor. The current board design lines. This configuration is accomplished by moving the utilizes the internal resistors and the V pins are wired to jumper wire from SMA GND ring to complementary V TDx TDx ground. (More information on termination is provided in pin pad (example: VTD0 and VTD0b for D0 input and AN8020). If evaluation does not require use of internal VTD1 and VTD1b for D1 input). termination resistors, 0402 chip resistor pads are provided DUT Termination on the bottom side of the evaluation board. The jumper wires For standard lab setup and test, a split (dual) power supply of the V pin pads should be removed (J1, J4, J13 and J15 TDx is required enabling the 50 internal impedance in the to SMA GND jumper). Solder the chip resistors to the oscilloscope to be used as a termination of the signals (in bottom side of the board between the appropriate input of the split power supply setup SMA GND is the system ground, device pin pads and the ground pads (for split power supply V is varied, and V is 1.25 V see Table 1, Power CC EE setup). Supply Levels). Likewise for CML outputs, CML stimulus signal need to be terminated to V via a 50 resistor. If internal resistors CC Board Components Configuration are used, the V pin pads should be wired to V . To TDx CC The NB4N527SMNEVB evaluation board requires eight accomplish this configuration, the jumper wire has to be side SMA connectors. Placement locations are described in moved from SMA GND ring to V ring on the bottom of CC Table 2 and Figure 3. the board. Table 2. SMA Connectors and Jumpers Placement Device J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 J12 J13 J14 J15 J16 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Connector No Yes Yes No No No No No Yes Yes Yes No No Yes Yes No Wire SMA GND No No SMA GND V No No V No No No No SMA GND No No SMA GND EE CC