PIC16F916-I/ML【PDF 37/229 页】IC PIC MCU FLASH 8KX14 28QFN

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Sheet目录3862

33页 34页 35页 36页 [37页]38页 39页 40页 41页

216

8018P–AVR–08/10

ATmega169P

22. ADC - Analog to Digital Converter

22.1

Features

10-bit Resolution

0.5 LSB Integral Non-linearity

±2 LSB Absolute Accuracy

13 s - 260 s Conversion Time (50 kHz to 1 MHz ADC clock)

Up to 15 ksps at Maximum Resolution (200 kHz ADC clock)

Eight Multiplexed Single Ended Input Channels

Optional Left Adjustment for ADC Result Readout

0 - V

CC ADC Input Voltage Range

Selectable 1.1V ADC Reference Voltage

Free Running or Single Conversion Mode

ADC Start Conversion by Auto Triggering on Interrupt Sources

Interrupt on ADC Conversion Complete

Sleep Mode Noise Canceler

22.2

Overview

The ATmega169P features a 10-bit successive approximation ADC. The ADC is connected to

an 8-channel Analog Multiplexer which allows eight single-ended voltage inputs constructed

from the pins of Port F. The single-ended voltage inputs refer to 0V (GND).

The ADC contains a Sample and Hold circuit which ensures that the input voltage to the ADC is

held at a constant level during conversion. A block diagram of the ADC is shown in Figure 22-1

on page 217.

The ADC has a separate analog supply voltage pin, AVCC. AV

CC must not differ more than

±0.3V from V

CC. See the paragraph ”ADC Noise Canceler” on page 222 on how to connect this

pin.

Internal reference voltages of nominally 1.1V or AVCC are provided On-chip. The voltage refer-

ence may be externally decoupled at the AREF pin by a capacitor for better noise performance.

The Power Reduction ADC bit, PRADC, in ”PRR – Power Reduction Register” on page 45 must

be written to zero to enable the ADC module.

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