The LMK5B33414 has VDD and VDDO supply pins that operate from 3.3 V ± 5%.
J500 is the main power terminal to the external power supply. Power SMA port VIN1 (J2) provides an alternative connector style to apply power through coax cable. By default this SMA connector is not populated.
On the EVM, there are three methods for supplying power.
The default power configuration uses the onboard DC/DC supply (U500) to power all VDD and VDDO pins as well as the onboard XO from an external 12-V supply input to VIN4 on J500.
The LDO power configuration uses three separate LDO regulators (U9, U10, and U11) to power the VDD, VDDO, and XO from an external 5-V supply input to VIN1 on J500 (or J2).
The direct power configuration allows for separate voltage supplies for the VDD, VDDO, and XO. In the direct power configuration mode, an external 3.3-V supply is provided to VIN1 to power the VDD pins, an external 3.3-V supply is provided to VIN2 to power the VDDO pins, and an external 3.3-V supply is provided to VIN3 to power the onboard XO.
Note: Not every power connection is used or required to operate the EVM. Other power configurations are possible. See the power schematics in Figure 4-1 and Figure 4-3.
Figure 3-2 Default Power Jumper Configuration.
Figure 3-2 shows the default power jumper locations and settings. Table 3-2 shows the suggested power configurations for the LMK5B33414.
Table 3-2 Suggested Power Configurations
CONNECTION
NAME
ONBOARD DC/DC SUPPLY
(DEFAULT)
ONBOARD LDO REGULATORS
DIRECT EXTERNAL SUPPLIES
VDD = 3.3 V (DCDC1)
VDDO = 3.3 V (DCDC1)
XO = 3.3 V (DCDC1)
VDD = 3.3 V (LDO1)
VDDO = 3.3 V (LDO2)
XO = 3.3 V (LDO3)
VDD = 3.3 V (EXT. VIN1)
VDDO = 3.3 V (EXT. VIN2)
XO = 3.3 V (EXT. VIN3)
J500
PWR
Pin 1 (VIN1): n/a
Pin 2 (VIN2): n/a
Pin 3 (VIN3): n/a
Pin 4 (VIN4): Connect to external 12-V supply
Pin 5 (GND): Connect to supply ground
Pin 1 (VIN1): Connect to external 5-V supply
Pin 2 (VIN2): n/a
Pin 3 (VIN3): n/a
Pin 4 (VIN4): n/a
Pin 5 (GND): Connect to supply ground
Pin 1 (VIN1): Connect to external 3.3-V supply
Pin 2 (VIN2): Connect to external 3.3-V supply
Pin 3 (VIN3): Connect to external 3.3-V supply
Pin 4 (VIN4): n/a
Pin 5(GND): Connect to supply ground
JP1
VDD
Tie pins 1-2 (opposite to designator) to select 3.3 V from DCDC1 to VDD Plane
Tie pins 3-4 (middle pins) to select 3.3 V from LDO1 to VDD Plane
Tie pins 5-6 (adjacent to designator) to select external VIN1 to VDD Plane
JP2
VDDO
Tie pins 1-2 (opposite to designator) to select 3.3 V from DCDC1 to VDD Plane
Tie pins 3-4 (middle pins) to select 3.3 V from LDO2 to VDDO Plane
Tie pins 5-6 (adjacent to designator) to select external VIN2 to VDDO Plane
JP3
XO
Tie pins 1-2 (opposite to designator) to select 3.3V from DCDC1 to XO supply
Tie pins 3-4 (middle pins) to select 3.3 V from LDO3 to XO supply
Tie pins 5-6 (adjacent to designator) to select external VIN3 to XO supply