LMH1982SQEEVAL National Semiconductor, LMH1982SQEEVAL Datasheet - Page 16

• Manufacturer Part Number: LMH1982SQEEVAL
• Description: BOARD EVAL FOR LMH1982SQE
• Manufacturer: National Semiconductor

Specifications of LMH1982SQEEVAL

• Main Purpose: Video, Video Processing
• Utilized Ic / Part: LMH1982SQE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

The Charge Pump Current for PLL 1, 2, 3, and 4 can be controlled using the up/down control to
adjust the value inside each text field. With each click on the up/down control, the application
dynamically writes the new value to the device. Alternatively, when a new value is typed and
the ENTER key is pressed, the application will dynamically write the value to the device. A
smaller value corresponds to less charge pump current. Refer to the datasheet for guidelines to
program the charge pump current controls for PLLs 1-4.
NOTE: Data bit 4 of register 06h is inverted internally, so it must be accounted for when
programming the charge pump current control text field for PLL 4 in the GUI. For example, the
text field for PLL 4 should be programmed with 0d (0000b) to program an effectively value of
8d (1000b).
5.4 File Menu
The SAVE button allows you to save the register data stored in the Data Grid to a register
configuration file for future reference. Before proceeding to save the file, press the READ ALL
button to update the Data Grid with the latest register data. When SAVE is clicked, the
application will prompt you to select a folder and file name to save the file. The saved file is
essentially a text file (.txt) in comma separated values format.
The LOAD button allows you to open a saved register configuration file and load it directly to
the GUI. When LOAD is click, the application will prompt you to select the file to open.
5.5 Data Grid
When the application is started, all control registers are read and stored to the Data Grid. The
READ ALL button should be clicked to update the data grid with the current register data. The
data grid may be used to view the current register data in tabular form. The data grid also
enables the control register data to be saved to a file using the SAVE button in the File Menu,
described in the next section.
National Semiconductor Corp.
Rev. 2.1, 5/13/2008
Page 16 of 20