Datasheet

MAX5980 Evaluation Kit
Evaluates: MAX5980
15Maxim Integrated
EN Signal
The EV kit features a pushbutton switch (S1) to enable or
disable the IC.
Ethernet Optional PHY-Side
Ethernet Connections
The EV kit includes jumpers JU35–JU38 for a user to use
the optional PHY-side Ethernet connections (GND_P1,
GND_P2, GND_P3, and GND_P4; VCC_P1, VCC_P2,
VCC_P3, and VCC_P4). PCB pads are provided for con-
necting an external VCC power supply. See J2 in the
Component List for specific connections. Table 7 lists the
specific jumper for each port. Jumpers JU32 and JU34
have a shorted PCB trace on the bottom layer of the PCB.
External +3.3V VDIG Operation
The EV kit’s on-board +3.3V LDO circuit can be reconfig-
ured to operate the EV kit circuit with an externally sup-
plied +3.3V DC source. Follow the step below to operate
the EV kit with an externally supplied +3.3V source:
•
Remove resistor R16, isolates the on-board LDO, U10.
• Connect the external +3.3V power-supply ground
terminal to the VEE PCB pad and the external power-
supply positive to the VDIG PCB pad.
• RemoveresistorR55.
Table 7. PHY-Side Ethernet Connections Jumper Functions (JU35–JU38)
PORT JUMPER PCB TRACE SHORT EV KIT OPERATION
Port 1 JU35
Open Isolate PHY and PoE
Install short PHY and PoE share the same GND
Port 2 JU36
Open Isolate PHY and PoE
Install short PHY and PoE share the same GND
Port 3 JU37
Shorting trace intact Isolate PHY and PoE
Cut open PHY and PoE share the same GND
Port 4 JU38
Open Isolate PHY and PoE
Install short PHY and PoE share the same GND