Datasheet

EVAL-AD5764R
Rev. 0 | Page 6 of 12
The main window is divided into five sections: Read/Write
Registers, Function Register Configuration, Hardware
Configuration, Measure AD5764R Core Temperature, and
Calibration.
Read/Write Registers
In the Read/Write Registers section, you can write a value to—
or read a value from—any AD5764R register. The logic values
of all bits in the input register are also displayed. Access to the
registers is via two drop-down boxes. In the first box, you can
select a register, and in the second box, you can select one of the
four DAC channels. In the case of the function register, the
second drop-down box is not available. Depending on the
register selected, either another drop-down box (if a coarse gain
register is selected) or a text box is displayed.
For instance, to write to the DAC A data register, do the following:
1. Select Data Register from the first drop-down box and
DAC A from the second drop-down box (see Figure 2).
2. Two text boxes are displayed in which you can type a
voltage value (E nter Vo ltag e Valu e box) or a 16-bit data
value (Enter Data Value box).
3. Click the button to the right of the text boxes to select hex
or decimal format for the value.
4. Press the Enter key to complete the write operation.
Function Register Configuration
The Function Register Configuration section allows you to
define the configuration of the function register, that is, to
enable/disable the Local Gnd Offset Adjust feature, enable/
disable the Serial Data Output (SDO) pin, and set the D0 and
D1 Digital I/O Ports as inputs or outputs and read or set their
values. The CLEAR button initiates a software clear operation,
and the LOAD button initiates a software load operation. See
the AD5764R data sheet for further information.
Hardware Configuration
In the Hardware Configuration section, you can configure the
hardware setup of the AD5764R; that is, you can set the
configuration of the BIN/
2sCOMP
,
CLR
,
LDAC
and
RSTIN
pins. When the D0 and D1 ports are defined as inputs, you can
also drive the D0 and D1 pins high or low and read their values
in the Function Register Configuration section.
Measure AD5764R Core Temperature
The Measure AD5764R Core Temperature section displays the
voltage at the TEMP pin (as provided by the on-board ADC)
and the related core temperature. To obtain updated measure-
ments, click the Measure button.
Calibration
The Calibration section allows you to remove any offset or gain
errors that exist on each of the DACs. The procedure to calibrate
a DAC channel is as follows:
1. Select the DAC to be calibrated in the Read/Write
Registers section.
2. In the Calibration section, click the Perform Offset &
Gain Calibration on Selected DAC button. The
Calibration section display changes as shown in Figure 3.
3. In the Read/Write Registers section, load 0 V to the DAC
and measure the output voltage of the DAC.
4. Enter the measured value in the Calibration section.
5. Click Done. The offset error should now be reduced and
the Calibration section should display changes as shown
in Figure 4.
6. In the Read/Write Registers section, load zero scale to the
DAC (−4.096 V, −4.201 V, or −4.311 V).
7. Measure the output voltage of the DAC and enter the
measured value in the Calibration section.
8. Click Done. The gain error should now be reduced.
9. Repeat this procedure for the other three DACs.
08161-003
Figure 3. Calibrating for Offset Error
08161-004
Figure 4. Calibrating for Gain Error