TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439I–JUNE 2007–REVISED MARCH 2011
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4.7.1 ADC Connections if the ADC Is Not Used
It is recommended to keep the connections for the analog power pins, even if the ADC is not used.
Following is a summary of how the ADC pins should be connected, if the ADC is not used in an
application:
•
•
•
•
•
•
•
•
VDD1A18/VDD2A18 – Connect to VDD
VDDA2, VDDAIO – Connect to VDDIO
VSS1AGND/VSS2AGND, VSSA2, VSSAIO – Connect to VSS
ADCLO – Connect to VSS
ADCREFIN – Connect to VSS
ADCREFP/ADCREFM – Connect a 100-nF cap to VSS
ADCRESEXT – Connect a 20-kΩ resistor (very loose tolerance) to VSS
ADCINAn, ADCINBn – Connect to VSS
.
When the ADC is not used, be sure that the clock to the ADC module is not turned on to realize power
savings.
When the ADC module is used in an application, unused ADC input pins should be connected to analog
ground (VSS1AGND/VSS2AGND
)
NOTE
ADC parameters for gain error and offset error are specified only if the ADC calibration
routine is executed from the Boot ROM. See Section 4.7.3 for more information.
82
Peripherals
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