Datasheet

EVAL-AD5667R
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
To power the EVAL-AD5667R, apply 2.7 V to 5.5 V between the
AV
DD
and AGND inputs for the analog supply of the AD5667R
(J6). Alternatively, placing Link 6 in Position B powers the
analog circuitry from the USB port (default setting). This
powers all devices with a 3.3 V supply.
Both AGND and DGND inputs are provided on the board.
The AGND and DGND planes are connected at one location
close to the AD5667R. To avoid ground loop problems, it is
recommended not to 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 and for evaluating the part in standard/fast mode
with an external 3 V reference, the AD780. The default link
options are listed in Table 1.
Table 1. Link Options Setup for PC Control (Default)
Link No. Option
LK1, LK2 Inserted
LK3 A
LK4 B
LK5 B
LK6 B
LK7 A
LK8 A
LK9 Not applicable
LK10 Removed
LK11 B
LK12 Not applicable
LK13 A
LK16 Inserted
Table 2. Link Functions
Link No. Function
LK1, LK2
These links connect the V
OUT
A and V
OUT
B pins of the AD5667R to the input pins of the ADG728 demultiplexer to monitor the DAC
output value using the on-board AD7992 ADC.
LK3 This link allows the user to hardwire the ADDR pin to set the two LSBs (A1, A0) of the 7-bit address: 00011A1A0.
Position A connects the ADDR pin to AVDD; therefore, two LSBs are 00.
Position B connects the ADDR pin to GND; therefore, two LSBs are 11.
When there is no connection, the 2 LSBs are 10.
LK4 This link selects the AVDD power supply source for the AD780 reference.
Position A selects J6 as the AD780 power supply source.
Position B selects the 5 V USB supply voltage as the AD780 power supply source.
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 3.3 V power supply source as the AVDD analog circuitry power supply source (see LK6).
LK6 This link selects the 3.3 V power supply source for the digital circuitry.
Position A selects J7 as the digital circuitry power supply source.
Position B selects the USB port as the 3.3 V digital circuitry power supply source.
LK7
This link selects whether the AD5667R evaluation board is controlled by the PC via the USB port or by an external source via SMB
connectors (J1 to J4).
Position A selects control by the PC via the USB port.
Position B selects control by an external source via SMB connectors (J1 to J4).
LK8
This link sets the RESET
pin on the . ADG728
Position A allows normal operation of the switch.
Position B resets the switch.
LK9 Not applicable.
LK10 This link connects a 0.1 μF capacitor to AGND on the V
REFOUT
pin. It is recommended to connect this when using the internal reference.