ATtiny48 datasheet(158/266 Pages) ATMEL

158 / 266 page

158

8008C–AVR–03/09

ATtiny48/88

17. Analog-to-Digital Converter

17.1

Features

• 10-bit Resolution

• 1 LSB Integral Non-linearity

• ± 2 LSB Absolute Accuracy

• 14 µs Conversion Time

• 15 kSPS at Maximum Resolution

• Six Multiplexed Single Ended Input Channels

• Two Additional Multiplexed Single Ended Input Channels (TQFP and QFN/MLF Packages, Only)

• Temperature Sensor Input Channel

• 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

• Interrupt on ADC Conversion Complete

• Sleep Mode Noise Canceler

17.2

Overview

ATtiny48/88 features a 10-bit, successive approximation Analog-to-Digital Converter (ADC). The

ADC is wired to a nine-channel analog multiplexer, which allows the ADC to measure the volt-

age at six (or eight, in 32-lead packages) single-ended input pins and from one internal, single-

ended voltage channel coming from the internal temperature sensor. Single-ended voltage

inputs are referred 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 17-1

on page 159.

There is a separate analog supply voltage pin for the ADC, AV

CC. Analog supply voltage is con-

nected to the ADC via a passive switch. The voltage difference between supply voltage pins V

and AV

CC may not exceed. See section “ADC Noise Canceler” on page 165 on how to connect

the analog suplly voltage pin.

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

CC can be used

as reference voltage.

ATtiny48 Datasheet(PDF) 158 Page - ATMEL Corporation