Datasheet

Evaluation Board User Guide UG-144
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
To power the EVAL-AD5064EBZ, supply 5.5 V between the
AVDD and AGND inputs for the analog supply of the AD5064.
Alternatively, placing Link 6 in Position B powers the analog
circuitry from the USB port (default setting).
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close to
the AD5064. To avoid ground loop problems, do not connect
AGND and DGND elsewhere in the system.
Each supply is decoupled to the relevant ground plane with
10 μF and 0.1 μF capacitors. Each device supply pin is also
decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant
ground plane.
LINK OPTIONS
A number of link and switch options on the evaluation board
should
be set for the required operating setup before using the
board. The functions of these link options are described in
detail in Table 2. The default setup is for control by the PC via
the USB port. The default link options are listed in Table 1.
Table 1. Link Options Setup for PC Control (Default)
Link No. Option
LK1 to LK4 Inserted
LK5 B
LK6 B
LK7 A
LK8 A
LK9 B
LK10 A
LK11 A
LK12 A
LK13 to LK16 B
Table 2. Link Functions
Link No. Function
LK1 to LK4
These links connect the V
OUT
A to V
OUT
D pins of the AD5064 to the input/output pins of the ADG738 demultiplexer to
monitor the DAC output value using the on-board AD7476 ADC.
LK5 This link selects the AVDD power supply source for the analog circuitry.
Position A selects J6 as the AVDD analog circuitry power supply source.
Position B selects the 5 V power supply source as the AVDD analog circuitry power supply source (see LK6).
LK6 This link selects the 5 V power supply source for the digital circuitry.
Position A selects J7 as the 5 V digital circuitry power supply source.
Position B selects the USB port as the 5 V digital circuitry power supply.
LK7
This link selects whether the AD5064 evaluation board is controlled by the PC via the USB port or by an external
source via the SMB connectors (J1 to J5).
Position A selects control by the PC via the USB port.
Position B selects control by an external source via the SMB connectors (J1 to J5).
LK8
This link sets the RESET
pin on the ADG738.
Position A allows normal operation of the switch.
Position B resets the switch.
LK9 This link selects the AVDD power supply source for the REF195.
Position A selects J6 as the REF195 power supply source.
Position B selects the AVDD as the REF195 power supply source (see LK5).
LK10 This link selects the DAC power supply source.
Position A selects the AVDD as the DAC power supply source.
Position B selects an external source via SMB Connector EXT_VDD as the power supply source.
LK11 This link selects the DAC voltage source.
Position A selects the DAC power supply source as the DAC voltage source (see LK10).
Position B selects the on-board REF195 5 V reference as the DAC voltage source.
LK12 This link selects whether the part power-on resets to zero or midscale.
Position A ensures that the POR of the part resets to midscale.
Position B ensures that the POR of the part resets to zero scale.
LK13 to LK16 These links select the reference sources for V
REF
A to V
REF
D.
Position A selects an external reference via the SMB connectors (EXT_REF_A, EXT_REF_B, EXT_REF_C, and EXT_REF_D).
Position B selects the on-board REF195 5 V reference as the reference source.