EVM Software Overview
5.2.8
Slew Rate Configuration
Use the
Slew Rate
section of the
Block Diagram
tab, as shown in
, to set the various slew-rate
controls. The
Slew Rate
drop-down menu sets the slewing frequency. The
Slew Rate Step Size
drop-
down menu sets the step size, which is listed in LSB increments with the 12-bit step sizes in parentheses.
The
Slew Enable
toggle button enables the programmed slew rates and step size on the DAC.
Figure 19. Setting Slew Rates
5.2.9
Cyclic Redundancy Check
The
CRC Enable
toggle button enables the DACx760 or DACx750 cyclic redundancy check function.
When the button is pressed, the EVM software informs the user that the configuration register will be
written to immediately, as shown in
. It is written immediately to make sure that any other
pending changes are written to the DACx760 or DACx750 with the correct CRC value.
Figure 20. CRC Enable and Dialog
5.2.10
Clear Functionality
The
CLRSEL
drop-down menu, as shown in
, sets the value of VOUT after a power-on and reset
occur. The
CLEAR
button sets the CLR pin high, resulting in a
clear
state. Note that the DACx760 and
DACx750 set the voltage out to midscale (negative full-scale when in bipolar mode for DACx760 devices)
if either the CLR-SEL pin is high or the register is set to midrange.
Figure 21. CLRSEL Drop-Down Menu and Clear Button
15
SBAU229 – April 2014
DACx760EMC-EVM
Copyright © 2014, Texas Instruments Incorporated
