Datasheet

5 EVM Operation
5.1 Analog Input
5.2 Digital Control
5.3 Chip Select (Shutdown)
5.4 Digital I/O Buffers
5.5 Default Jumper Locations
www.ti.com EVM Operation
This section provides information on the analog input, digital control, and general operating conditions of
the MSOP-8EVM.
The analog input source can be applied directly to J1 (top or bottom side) or through optional amplifier and
signal conditioning modules. The analog input range depends on the configuration of the EVM and the
ADC installed at location U1. Consult the specific device data sheet to determine the maximum analog
input range.
The digital control signals can be applied directly to J2 (top or bottom side). The modular MSOP-8EVM
can also be connected directly to a DSP or microcontroller interface board. Visit the product folder for the
MSOP-8EVM or the installed device for a current list of compatible interfaces and/or recommended
accessory boards.
Jumper JMP2 is provided to allow the selection of the signals applied to the chip select ( CS) or shutdown
(SHDN) pin of the ADC installed on the EVM. The factory default condition for the EVM has a shunt
jumper placed between pins 1-2 of JMP2. This configuration allows the Frame Sync (FS) signal from a
DSP host system to be used as a chip select for the ADC. This signal originates from J2.7. When JMP2 is
moved to pins 2-3, the CS (SHDN) signal is applied via J2.1.
Single gate buffers U3, U5, and U6 are provided to ensure the safe operation of the modular MSOP-8EVM
with low-voltage host controllers. The digital I/O voltage applied to these buffers via JMP3 should be set in
accordance with the operating voltage of the host controller.
Table 5 lists the jumpers found on the EVM and the respective factory default condition of each.
Table 5. Jumper Descriptions
Jumper Shunt Position Jumper Description
JMP1 Pins 1-2 Controls ADC supply voltage (default is +5V analog source)
JMP2 Pins 1-2 Controls ADC CS (SHDN) pin (default is FS from DSP host)
JMP3 Pins 5-6 Controls digital I/O voltage (default is +3.3V digital source)
JMP4 CLOSED Ties analog and digital grounds together
JMP5 Pins 1-2 Controls external reference source (default is +2.5V from U2)
JMP6 Pins 1-2 Controls reference source to ADC (default is onboard reference/buffer circuit)
SBAU140 – December 2008 MSOP-8EVM and MSOP-8EVM-PDK 7
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