LM3S1621 Datasheet, PDF (603/947 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Figure 13-3. Sample Averaging Example
Stellaris^® LM3S1621 Microcontroller
A+B+C+D
4
A+B+C+D
4
INT
13.3.4
Analog-to-Digital Converter
The Analog-to-Digital Converter (ADC) module uses a Successive Approximation Register (SAR)
architecture to deliver a 10-bit, low-power, high-precision conversion value. The
successive-approximation algorithm uses a current mode D/A converter to achieve lower settling
time, resulting in higher conversion speeds for the A/D converter. In addition, built-in sample-and-hold
circuitry with offset-calibration circuitry improves conversion accuracy. The ADC must be run from
the PLL or a 16-MHz clock source. Figure 13-4 shows the ADC input equivalency diagram; for
parameter values, see “Analog-to-Digital Converter (ADC)” on page 902.
Figure 13-4. ADC Input Equivalency Diagram
VDD
Stellaris® Microcontroller
ESD
Clamp
R_ADC
10-bit
converter
V_IN
ESD
Clamp
I_L
C_ADC
Sample and hold
ADC converter
January 21, 2012
603
Texas Instruments-Production Data