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EVAL-AD5686RSDZ

P1-P3P4-P6P7-P9P10-P12P13-P13
UG-725 EVAL-AD5686RSDZ User Guide
Rev. A | Page 4 of 13
Table 4. Test Point Descriptions
Test Point Description
AGND Analog ground.
DGND Digital ground.
SCLK/A0 Serial clock input. Data is clocked into the input shift register on the falling edge of the serial clock input. Data can be
transferred at rates of up to 50 MHz. This signal is named SCLK_A0 in Figure 7.
SDO/SDA Serial data output. This output daisy chains a number of AD5686R/AD5685R/AD5684R devices together, or it can be
used for read back. The serial data is transferred on the rising edge of SCLK and is valid on the falling edge of the clock.
This signal is named SDO_SDA in Figure 7.
SYNCB/SCL Active low control input. This is the frame synchronization signal for the input data. When SYNCB goes low, data is
transferred in on the falling edges of the next 24 clocks. This signal is named SYNCB_SCL in Figure 7.
SDIN/A1
Serial data input. This device has a 24-bit input shift register. Data is clocked into the register on the falling edge of the
serial clock input. This signal is named SDIN_A1 in Figure 7.
VOUTA to VOUTD Analog output voltage from DAC A to DAC D, respectively. The output amplifier has rail-to-rail operation.
EVAL-AD5686RSDZ User Guide UG-725
Rev. A | Page 5 of 13
EVALUATION BOARD SOFTWARE
INSTALLING THE SOFTWARE
The evaluation kit for the AD5686R includes self installing software
on the CD. The software is compatible with Windows® XP (32-bit),
Windows Vista, and Windows 7 (32-bit and 64-bit). To ensure
that the SDP board is recognized when it connects to the PC,
the software must be installed before connecting the SDP board
to the USB port of the PC.
To install the software, take the following steps:
1. Start the Windows operating system and insert the CD.
2. The installation software opens automatically. If it does not
open automatically, run the setup.exe file from the CD.
3. After installation is complete, power up the evaluation
board as described in the Power Supplies section.
4. Connect the evaluation board to the SDP board and the SDP
board into the PC using the USB cable included in the box.
5. When the software detects the evaluation board, proceed
through the dialog boxes that appear to finalize the
installation.
RUNNING THE SOFTWARE
To run the program, take the following steps:
1. Connect the evaluation board to the SDP board and
connect the USB cable between the SDP board and the PC.
2. Click Start > All Programs > Analog Devices > AD56x6R
Evaluation Software > AD56x6R Evaluation Software.exe to
run the software. When the software connects to the
evaluation board, the message in Figure 2 displays.
Figure 2. Connection Message
3. If the SDP board is not connected to the USB port when
the software is launched, a connectivity error displays (see
Figure 3). Connect the evaluation board to the USB port of
the PC, wait a few seconds, click Rescan, and follow the
on-screen instructions.
Figure 3. Connectivity Error
4. Alternatively, you can use the software without an
evaluation board. The software runs in simulation mode,
displaying expected outputs based on the input data (see
Figure 4). Note that a 2.5 V reference voltage is used in
simulation mode. A screen similar to Figure 5 in which the
user chooses which device the simulation should run
appears. The main window of the AD5686R evaluation
software then opens, as shown in Figure 6.
Figure 4. Simulation Mode
Figure 5. Device Selection for Simulation Mode
12474-003
12474-004
12474-105
UG-725 EVAL-AD5686RSDZ User Guide
Rev. A | Page 6 of 13
Figure 6. AD5686R Evaluation Software Main Window
SOFTWARE OPERATION
The software for the AD5686R allows the user to program
values to the input and DAC registers of each DAC individually
or collectively.
Write to Input Register
Click Write to Input Register to load the value into the INPUT
VALUE (HEX) box for the input register of any DACs selected
in the DAC A, DAC B, DAC C, and DAC D boxes.
Write to Input and DAC Register
Click Write to Input and DAC Register to load the value into
the input data control for the DAC registers selected in the DAC A,
DAC B, DAC C, and DAC D boxes. The DAC outputs are
updated automatically with the appropriate voltage.
Update DAC Register from Input Register
Click Update DAC Register from Input Register to copy the
value in the DAC input register to the corresponding DAC register.
DAC outputs are updated automatically with the appropriate
voltage.
LDAC CONTROL
Within the HARDWARE LDAC PIN drop-down menu, select
LDAC LOW to bring the LDAC pin low, and then select LDAC
HIGH to return it to high. This action copies the data from the
input registers to the DAC registers, updating the outputs
accordingly.
GAIN Control
The GPIO of the SDP sets the logic level of the GAIN pin and
the software controls it. To display the correct voltage, set the
gain selection to match the level of the GAIN pin. Select × 1 or
× 2 from the GAIN drop-down menu to set the gain.
Reference Control
The AD5686R has an on-chip reference that can be disabled to
reduce power consumption. Select Reference OFF from the
REFERENCE drop-down menu to disable the on-chip reference.
Power-Down Control
Each of the DACs can be powered down individually. Each of
the DACs has an associated POWER-DOWN DAC x drop-down
menu that allows the device to operate in normal mode, be
powered down with either a 1 kΩ or a 100 kΩ resistor to ground,
or be three-stated. When power-down mode is selected, the
software sends the appropriate command to the AD5686R and
sets the appropriate channel to the selected power-down mode.
12474-005
P1-P3P4-P6P7-P9P10-P12P13-P13

EVAL-AD5686RSDZ

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Buy EVAL-AD5686RSDZ
Manufacturer:
Analog Devices Inc.
Description:
Data Conversion IC Development Tools EVAL BRD AD5686
Lifecycle:
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