Datasheet

EVAL-AD5064-1EBZ
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
To power the EVAL-AD5064-1EBZ, supply 5.5 V between the
AVDD and AGND inputs for the analog supply of the AD5064.
Alternatively, placing LK6 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 planes.
LINK OPTIONS
Before using the evaluation board, a number of link and switch
options should be set to the required operating setup. The
default link options are listed in Table 1 . Table 2 describes the
functions of these link options. The default setup is controlled
by the PC via the USB port.
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 Removed
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 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 source.
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. Note that for optimum operation of the REF195, it should be
powered from 7 V.
Position B selects the AVDD as the REF195 power supply source (see LK5).
LK10 This link selects the use of a 0.1 μF capacitor on the DAC reference wire.
LK11 This link selects the DAC reference source.
Position A selects J11 as the DAC reference source.
Position B selects the on-board REF195 5 V reference as the DAC reference source.
LK12 This link selects whether the part power-on resets to zero or midscale.
Position A ensures that the part power-on resets to midscale.
Position B ensures that the part power-on resets to zero scale.
LK13 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 or an external reference as the DAC voltage source (see LK11).