Datasheet

SPI™ Compatible Gain Control Using the SPISU2 Card

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5 SPI™ Compatible Gain Control Using the SPISU2 Card

The LMH6522_EVAL board can easily be controlled in the serial mode using a Texas Instruments SPISU2

USB to SPI controller card. This card and the required software are available on the TI website. Directions

for installing the USB control software and evaluation board drivers are in the user's guide available in the

document, SNLU086.

To use the SPI card, the LMH6522 DVGA must be put into serial mode. This is done by placing a shorting

block on the MODE jumper pins which are located near the power connectors in the center of the board.

Once this shorting block is in place the switches on the SWA switch block all need to be put in the OFF

position. If the switches are in the ON position the digital lines will be grounded and the SPISU2 card will

not be able to communicate with the DVGA.

Once the SPUSI2 board drivers and TinyI2CSPI software are installed, connect the SPUSI2 board directly

onto the LMH6522_EVAL double-row header (J1) by aligning pin 1 as shown in Figure 4. Plug the USB

cable into the SPISU2 card and the host PC. Start the TinyI2CSPI software and load the LMH6522 profile

as shown in Figure 5. Additional commands can be generated by changing the data in the MOSI column.

For details on the data to be sent to the DVGA registers, see the LMH6522 data sheet (SNOSB53). The

example SPI commands are a good starting point for generating the desired commands.

SPISU2 Header Pins Serial Function

1 Chip Select

2 Ground

3 Clock

4 N/A

5 Serial Data Out (MISO)

6 N/A

7 Serial Data IN (MOSI)

8 -14 N/A

AN-2072 LMH6522 Evaluation Board SNOA552B–July 2011–Revised May 2013

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