ATXMEGA128D4 datasheet(39/100 Pages) ATMEL

39 / 100 page

8135G–AVR–08/10

XMEGA D4

23. ADC - 12-bit Analog to Digital Converter

23.1

Features

• One ADC with 12-bit resolution

• 200 ksps sample rate

• Signed and Unsigned conversions

• 12 single ended inputs

• 8x4 differential inputs

• 3 internal inputs:

–

Integrated Temperature Sensor

–

VCC voltage divided by 10

–

Bandgap voltage

• Software selectable gain of 2, 4, 8, 16, 32 or 64

• Software Selectable accuracy of 8- or 12-bit.

• Internal or External Reference selection

• Event triggered conversion for accurate timing

• Interrupt/Event on compare result

23.2

Overview

XMEGA D4 devices have one Analog to Digital Converter (ADC), see Figure 23-1 on page 40.

The ADC converts analog voltages to digital values. The ADC has 12-bit resolution and is

capable of converting up to 200K samples per second. The input selection is flexible, and both

singleended and differential measurements can be done. For differential measurements an

optional gain stage is available to increase the dynamic range. In addition several internal signal

inputs are available. The ADC can provide both signed and unsigned results.

ADC measurements can either be started by application software or an incoming event from

another peripheral in the device. The latter ensure the ADC measurements can be started with

predictable timing, and without software intervention. The ADC has one channel, meaning there

is one input selection (MUX selection) and one result register available.

Both internal and external analog reference voltages can be used. A very accurate internal

1.00V reference is available.

An integrated temperature sensor is available and the output from this can be measured with the

ADC. A VCC/10 signal and the Bandgap voltage can also be measured by the ADC.

ATXMEGA128D4 Datasheet(PDF) 39 Page - ATMEL Corporation