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EVM Operation
8 EVM Operation
This section provides information on the analog input, digital control, and general operating conditions of
the ADS1282EVM.
8.1 Analog Input
The two differential input sources can be applied directly to J6 (top or bottom side) or through
signal-conditioning modules available for the modular EVM system. Each input is connected directly
through an OPA1632 buffer before reaching the ADS1282. The Common-Mode Voltage (V
COM
) for the
input buffer operational amplifiers is 2.5V supplied from the REF5025.
8.2 Digital Control
The digital control signals can be applied directly to J5 (top or bottom side). The modular ADS1282EVM
can also be connected directly to a DSP or microcontroller interface board, such as the
5-6K Interface
EVM or HPA-MCU Interface boards available from Texas Instruments, or the MMB0 if purchased as part
of the ADS1282EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the
ADS1282, see the relevant product folder on the TI web site. Some of the digital signals are controlled
directly with pins on J5. Other signals, such as SYNC, MFLAG, PMODE, and RESET controls, can only
be controlled by U7. These signals are configured and read using the I
2
C signals on pins 16 and 20 of J5.
The Format and Mode pins can be controlled by both methods (GPIO pins on J5, and the I
2
C control from
U7).
8.3 Default Jumper Settings and Switch Positions
Figure 4 shows the jumpers found on the EVM and the respective factory default conditions for each.
Figure 4. ADS1282EVM Default Jumper Locations
There is only one switch, S1, located on the ADS1282EVM; it is used to set the reference voltage (V
REF
).
The default position is to the left, indicating that the EVM is to use the onboard reference voltage.
7 SBAU144C – March 2009 – Revised May 2011 ADS1282EVM and ADS1282EVM-PDK User ' s Guide
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