15 Analog-to-Digital Converter (ADC)
An analog-to-digital converter (ADC) is a peripheral that converts a continuous analog voltage to a
discrete digital number. Two identical converter modules are included, which share 20 input channels.
The TM4C1294NCPDT ADC module features 12-bit conversion resolution and supports 20 input
channels, plus an internal temperature sensor. Each ADC module contains four programmable
sequencers allowing the sampling of multiple analog input sources without controller intervention.
Each sample sequencer provides flexible programming with fully configurable input source, trigger
events, interrupt generation, and sequencer priority. In addition, the conversion value can optionally
be diverted to a digital comparator module. Each ADC module provides eight digital comparators.
Each digital comparator evaluates the ADC conversion value against its two user-defined values to
determine the operational range of the signal. The trigger source for ADC0 and ADC1 may be
independent or the two ADC modules may operate from the same trigger source and operate on
the same or different inputs. A phase shifter can delay the start of sampling by a specified phase
angle. When using both ADC modules, it is possible to configure the converters to start the
conversions coincidentally or within a relative phase from each other, see “Sample Phase
Control” on page 1060.
The TM4C1294NCPDT microcontroller provides two ADC modules with each having the following
features:
■ 20 shared analog input channels
■ 12-bit precision ADC
■ Single-ended and differential-input configurations
■ On-chip internal temperature sensor
■ Maximum sample rate of two million samples/second
■ Optional, programmable phase delay
■ Sample and hold window programmability
■ Four programmable sample conversion sequencers from one to eight entries long, with
corresponding conversion result FIFOs
■ Flexible trigger control
– Controller (software)
– Timers
– Analog Comparators
– PWM
– GPIO
■ Hardware averaging of up to 64 samples
■ Eight digital comparators
1053June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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