Datasheet

EVAL-AD5764R
Rev. 0 | Page 4 of 12
Table 4. Link Options
Link No. Description
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 6.2 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.
Position B selects the on-board 5 V reference as the reference source.
LK5
This link connects the on-board 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 on-board reference source.
Position B connects REFAB to the on-board reference source.
LK6 This link connects the TEMP pin to the input of the on-board ADC.
When inserted, the voltage at the TEMP pin can be read back 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 AD5764R and ADG774BRQ (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 AD5764R 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.