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Setup Procedure
5
SLOU454 – June 2016
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Copyright © 2016, Texas Instruments Incorporated
LMH2832EVM-50 Evaluation Module
4.5
Connect EVM to the PC and LMH2832 EVM GUI Installation
The LMH2832 EVM GUI is used to control the LMH2832 EVM. It must be used to properly configure the
LMH2832 device.
1. Download the LMH2832 EVM GUI (
SLOC338
) from the TI website.
2. Extract the files from the zip file.
3. Run setup.exe and follow the installation prompts.
4. Connect the LMH2832EVM to the PC using a mini-USB cable.
5. Open the LMH2832 EVM GUI by going to Start Menu
→
All Programs
→
Texas Instruments
→
LMH2832 EVM GUI.
6. Verify that the green USB Status indicator is lit in the top right corner of the GUI. If it is not lit, click the
Reconnect USB
button and check the USB Status indicator again. If it is still not lit, then verify the EVM
is connected to the computer through the included mini-USB cable.
7. Follow the instructions in
Section 5
:
Amplifier Device Register Configuration
to correctly use the GUI to
program the LMH2832 device registers.
8. The DVGA register address and configuration values are found in the LMH2832 device data sheet
(
SBOS709
).
5
Amplifier Device Register Configuration
The LMH2832 channels are programmable via the serial programming interface (SPI) bus accessible
through the FTDI USB-to-SPI converter chip located on the EVM. A GUI is provided to write instructions
on the bus and program the registers of the LMH2832.
The LMH2832 individual channel gain can be controlled from –9 dB to 30 dB in 1-dB steps using register
address 5h and 7h for channels A and B, respectively. The amplifier is programmed to the maximum gain
(30 dB) when a value 0h is written to the gain control registers 5h and 7h, whereas a value 27h written to
the gain control registers programs the device to the minimum gain (–9 dB) setting.
Table 2
shows the
default LMH2832 SPI register map on power up. For more information about the registers in the
LMH2832, see the LMH2832 data sheet (
SBOS709
).
Table 2. LMH2832 Default SPI Register Map
Address (A[6:0], Hex)
R/W
Register
Default
0
R
Revision ID
B3h
1
R
Product ID
23h
2
R/W
Software Reset
00h
3
R/W
Power-down
00h
4
R/W
Channel A Bias Control
20h
5
R/W
Channel A Gain Control
14h
6
R/W
Channel B Bias Control
20h
7
R/W
Channel B Gain Control
14h
