Datasheet

EVAL-AD5764EB
Rev. 0 | Page 4 of 12
Table 4. Link Options
Link No. Function
LK1 This link selects the 5 V power supply source for the digital circuitry:
• Position A selects the USB port as the 5 V digital circuitry power supply source.
• Position B selects J2 as the 5 V digital circuitry power supply source.
LK2 This link selects the value of the short-circuit protection for the four DAC outputs:
• Position A selects a resistor value of 120 kΩ, selecting a current value of 500 μA.
• Position B selects a resistor value of 24 kΩ, selecting a current value of 2.5 mA.
• Position C selects a resistor value of 6 kΩ, selecting a current value of 10 mA.
• Position D selects a user-defined resistor value, selecting a user-defined current value.
LK3 This link connects AGNDA to 0 V.
LK4 This link selects the reference source:
• Position A selects the internal reference as the reference source. (AD5764R)
• Position B selects the on-board 5 V reference as the reference source.
LK5
This link connects the selected reference source to REFAB and REFCD: If sourcing REFAB external to the board via J3, Position B
should not be inserted. If sourcing REFCD external to the board via J4, Position A should not be inserted.
• Position A connects REFCD to the selected on-board or internal reference source.
• Position B connects REFAB to the selected on-board or internal reference source.
LK6 This link connects the TEMP pin to the input of the on-board ADC (AD5764R):
• When inserted, the voltage at the TEMP pin can be readback to the PC.
• When removed, the voltage at the TEMP pin is disconnected from the on-board ADC input.
LK7 This link selects the digital supply voltage value for the AD5764, U7, U8, and U9:
• Position A selects +3.3 V as the supply value.
• Position B selects +5 V as the supply value.
LK8
This link selects the state of the
LDAC pin:
• Position A allows the LDAC pin to be driven from either the PC or via J21 or the SMB connectors.
• Position B connects the
LDAC pin to DGND.
LK9
This link selects the state of the BIN/
2sCOMP pin when external control is selected via LK11:
• Position A connects the BIN/2sCOMP pin to DV
CC
selecting straight binary as the data coding format.
• Position B connects the BIN/
2sCOMP pin to DGND selecting twos complement as the data coding format
• Removing LK9 allows the BIN/
2sCOMP pin to be driven from J21.
LK10
This link selects the state of the
CLR pin when external control is selected via LK11:
• When inserted, the
CLR pin is connected to DGND and the four DAC outputs are cleared.
• When removed, the
CLR pin is pulled to DV
CC
through a 10 kΩ resistor.
LK11
This link selects whether the AD5764 evaluation board is controlled by the PC via the USB port or by an external source via
J21 or the SMB connectors:
• Position A selects the evaluation board to be controlled by an external source via J21 or the SMB connectors.
• Position B selects the evaluation board to be controlled by the PC via the USB port.
LK12 This link connects AGNDB to 0 V.
LK13 This link connects AGNDC to 0 V.
LK14 This link connects AGNDD to 0 V.