Datasheet

User's Guide
SLOU216B–January 2008–Revised January 2013
VCA8500BOARD
The Texas Instruments VCA8500BOARD evaluation module makes it easy to evaluate the performance of
the TI VCA8500 variable gain amplifier. This user's guide provides a description of the evaluation module
and its operation, schematic diagram, bill of materials, and the printed-circuit board layout.
If going from a Rev B BOARD to a Rev C BOARD, /CS has been changed to RESET.
Contents
1 Description ................................................................................................................... 2
2 Initial Configuration ......................................................................................................... 2
2.1 Power Supply ....................................................................................................... 2
3 Signals ........................................................................................................................ 2
3.1 Input Signals ........................................................................................................ 2
3.2 Output Signals ...................................................................................................... 2
3.3 TGC Outputs ........................................................................................................ 3
3.4 CW Outputs ......................................................................................................... 3
4 Microcontroller ............................................................................................................... 3
5 Modes of Operation ......................................................................................................... 3
5.1 Default-Power-Up Mode .......................................................................................... 4
5.2 PC Control Mode ................................................................................................... 4
5.3 Direct Control Mode ............................................................................................... 4
6 VCA8500BOARD Full-Access Software ................................................................................. 4
6.1 Loading the Software .............................................................................................. 4
6.2 Initial Start-up Screen ............................................................................................. 4
6.3 Other Program Functions ......................................................................................... 8
7 Printed-Circuit Board Layout, Bill of Materials, and Schematic ....................................................... 8
7.1 Printed-Circuit Board Layout ..................................................................................... 8
7.2 Bill of Materials .................................................................................................... 12
7.3 Schematic ......................................................................................................... 13
List of Figures
1 CW Output Circuit........................................................................................................... 3
2 Initial Start-up Screen ...................................................................................................... 5
3 Main Program Window ..................................................................................................... 6
4 CW Options Selection...................................................................................................... 7
5 Silkscreen — Top Layer ................................................................................................... 8
6 Ground ....................................................................................................................... 9
7 Power Plane 1............................................................................................................... 9
8 Power Plane 2 ............................................................................................................. 10
9 Ground ...................................................................................................................... 10
10 Silkscreen — Bottom Layer .............................................................................................. 11
11 Schematic Pg.1 ............................................................................................................ 14
12 Schematic Pg.2 ............................................................................................................ 15
List of Tables
1 Bill of Materials............................................................................................................. 12
1
SLOU216B–January 2008–Revised January 2013 VCA8500BOARD
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