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| 型號： | IQ80C52EXXX-12D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁數(shù)： | 45/108頁 |
| 文件大小： | 3682K |
| 代理商： | IQ80C52EXXX-12D |
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41
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
25. ADC - 12-bit Analog to Digital Converter
25.1
Features
One ADC with 12-bit resolution
2 Msps sample rate
Signed and Unsigned conversions
4 result registers with individual input channel control
12 single ended inputs
8x4 differential inputs
4 internal inputs:
–
Integrated Temperature Sensor
–
DAC Output
–
VCC voltage divided by 10
–
Bandgap voltage
Software selectable gain of 2, 4, 8, 16, 32 or 64
Selectable accuracy of 8- or 12-bit.
Internal or External Reference selection
Event triggered conversion for accurate timing
DMA transfer of conversion results
Interrupt/Event on compare result
25.2
Overview
XMEGA A4 devices have one Analog to Digital Converter (ADC), see Figure 25-1 on page 42.
The ADC converts analog voltages to digital values. The ADC has 12-bit resolution and is capa-
ble of converting up to 2 million samples per second. The input selection is flexible, and both
single-ended 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.
This is a pipeline ADC. A pipeline ADC consists of several consecutive stages, where each
stage convert one part of the result. The pipeline design enables high sample rate at low clock
speeds, and remove limitations on samples speed versus propagation delay. This also means
that a new analog voltage can be sampled and a new ADC measurement started while other
ADC measurements are ongoing.
ADC measurements can either be started by application software or an incoming event from
another peripheral in the device. Four different result registers with individual input selection
(MUX selection) are provided to make it easier for the application to keep track of the data. Each
result register and MUX selection pair is referred to as an ADC Channel. It is possible to use
DMA to move ADC results directly to memory or peripherals when conversions are done.
Both internal and external analog reference voltages can be used. An accurate internal 1.0V
reference is available.
An integrated temperature sensor is available and the output from this can be measured with the
ADC. The output from the DAC, VCC/10 and the Bandgap voltage can also be measured by the
ADC.
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