Analog Devices AD5370 Evaluation Board EVAL-AD5370EBZ EVAL-AD5370EBZ Hoja De Datos

 

Rev. Pr A| Page 4 of 12 

LK1 

Determines if the USB interface is to be used 
If this link is inserted the USB interface will generate the signals required to control the AD537x 
If this link is removed the USB interface is not used and header J3 must be used to provde signals to the AD537x 

LK3 

Selects Source of the RESET signal 
If this link is inserted the RESETsignal comes from either the RESET push-button being pressed or a RESET signal being issued 
by the USB interface 
If this link is removed the RESET signal must come for the header J3 

LK4 

Selects the Reference Source 
If this link is in position A the 3V reference is selected 
If this link is in position B the 5V reference is selected 
If this link is in position C the voltage on SMB connector EXT_REF is selected 

LK8 

Selects the Source of the CLR signal 
If this link is inserted the CLR signal comes from the USB interface 
If this link is removed the  CLR signal must come for the header J3 

 

The evaluation board kit comes supplied with a CD containing 
PC software allowing the user to control the evaluation board 
via the USB interface. The software must be installed before the 
evaluation board is connected to the USB port. The software 
installation program usually runs automatically when the CD is 
inserted in the drive but if this doesn’t happen the user should 
double-click on the SETUP.EXE file in the root directory of the 
CD. The software will be installed and shortcuts will be placed 
on the Start Menu in a folder called Analog Devices. When the 
software has been installed the evaluation board can be 
connected to the USB port. 

When the software is started the user is presented with a 
selection box. The selection box presents a choice of all the high 
channel count DACs in the AD536x and AD537x family. The 
user should click the button appropriate to the board being 
used. 

The first tab in the main operating window, shown in Figure 6, 
allows the user to send data to the registers of any of the DACs. 
All the available channels are shown in the DAC selection 
section. When one of the radio buttons is selected the lower 
portion of the screen will show the values currently assigned to 
that DAC channel. The X1A, X1B, M or C registers can be 
updated simply by entering the desired code and clicking the X, 
M or C button. Note that when the X button is pressed the X1A 
or X1B register is updated according to the selection of the A/B 
radio button.  
To update the DAC output the user should click the LDAC 
button. 

The Input Code block allows the user to store several 
commonly used values and select between them as required.  

The second tab of the tabbed dialog box also allows the user to 
change the contents of the Offset DACs. The values loaded to 
the Offset DACs will not affect the output voltages until LDAC 
is pulsed. 

The third tab of the tabbed dialog box allows the user to assert 
or negate the RESET, CLR and LDAC. The user can also write 
24 bits directly to the part. This can be useful, for example, to 
write to a group of channels using a single write operation. This 
function operates independently from the rest of the software 
so any changes made by a direct write will not be evident in the 
rest of the software. For example, if the direct write changes the 
X1 register of all channels to 0xFFFF the first tab in the main 
operating window will not be updated and will continue to 
show the previous values that were entered. 

The fourth tab shows the expected output voltages based on the 
values of the X, M and C registers from the main operating 
window, the reference value and the Offset DAC value. These 
values are recalculated every time the tab is viewed.