LM3S9D92_16 Datasheet, PDF (68/1412 Pages) Texas Instruments – Stellaris LM3S9D92 Microcontroller

Architectural Overview
1.3.7
1.3.7.1
Analog
The LM3S9D92 microcontroller provides analog functions integrated into the device, including:
■ Two 12-bit Analog-to-Digital Converters (ADC) with 16 analog input channels and a sample rate
of one million samples/second
■ Three analog comparators
■ 16 digital comparators
■ On-chip voltage regulator
The following provides more detail on these analog functions.
ADC (see page 609)
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 12-bit conversion resolution and supports
16 input channels plus an internal temperature sensor. Four buffered sample sequencers allow
rapid sampling of up to 16 analog input sources without controller intervention. Each sample
sequencer provides flexible programming with fully configurable input source, trigger events, interrupt
generation, and sequencer priority. Each ADC module has a digital comparator function that allows
the conversion value to be diverted to a comparison unit that provides eight digital comparators.
The LM3S9D92 microcontroller provides two ADC modules with the following features:
■ 16 shared analog input channels
■ 12-bit precision ADC with an accurate 10-bit data compatibility mode
■ 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
– PWM
– GPIO
■ Hardware averaging of up to 64 samples
■ Digital comparison unit providing eight digital comparators
68
July 03, 2014
Texas Instruments-Production Data