LM3S1N16 Datasheet, PDF (506/794 Pages) Texas Instruments – Stellaris® LM3S1N16 Microcontroller

Analog-to-Digital Converter (ADC)
12 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.
The Stellaris^® ADC module features 10-bit conversion resolution and supports eight input channels,
plus an internal temperature sensor. The 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. A digital comparator function is included which allows the
conversion value to be diverted to a digital comparator module. The 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 Stellaris LM3S1N16 microcontroller provides one ADC module with the following features:
■ Eight analog input channels
■ Single-ended and differential-input configurations
■ On-chip internal temperature sensor
■ Maximum sample rate of one million samples/second
■ Optional phase shift in sample time programmable from 22.5º to 337.5º
■ Four programmable sample conversion sequencers from one to eight entries long, with
corresponding conversion result FIFOs
■ Flexible trigger control
– Controller (software)
– Timers
– Analog Comparators
– GPIO
■ Hardware averaging of up to 64 samples
■ Digital comparison unit providing eight digital comparators
■ Converter uses an internal 3-V reference or an external reference
■ Power and ground for the analog circuitry is separate from the digital power and ground
■ Efficient transfers using Micro Direct Memory Access Controller (µDMA)
– Dedicated channel for each sample sequencer
– ADC module uses burst requests for DMA
506
January 21, 2012
Texas Instruments-Production Data