ATtiny44 datasheet(132/236 Pages) ATMEL

132 / 236 page

132

8006H–AVR–10/09

ATtiny24/44/84

16. Analog to Digital Converter

16.1

Features

• 10-bit Resolution

• 1.0 LSB Integral Non-linearity

• ± 2 LSB Absolute Accuracy

• 13µs Conversion Time

• 15 kSPS at Maximum Resolution

• Eight Multiplexed Single Ended Input Channels

• Twelve Differential Input Channels with Selectable Gain (1x, 20x)

• Temperature Sensor Input Channel

• Optional Left Adjustment for ADC Result Readout

• 0 - V

CC ADC Input Voltage Range

• 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

• Unipolar / Bipolar Input Mode

• Input Polarity Reversal Mode

16.2

Overview

The ATtiny24/44/84 features a 10-bit successive approximation ADC. The ADC is connected to

8-pin port A for external sources. In addition to external sources internal temperature sensor can

be measured by ADC. Analog Multiplexer allows eight single-ended channels or 12 differential

channels from Port A. The programmable gain stage provides ampification steps 0 dB (1x) and

26 dB (20x) for 12 differential ADC channels.

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 16-1

on page 133.

Internal reference voltage of nominally 1.1V is provided On-chip. Alternatively, V

CC can be used

as reference voltage for single ended channels. There is also an option to use an external volt-

age reference and turn-off the internal voltage reference.

ATtiny44 Datasheet(PDF) 132 Page - ATMEL Corporation