ATmega16 datasheet(198/315 Pages) ATMEL

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198

ATmega16(L)

2466E–AVR–10/02

Analog to Digital

Converter

Features

• 10-bit Resolution

• 0.5 LSB Integral Non-linearity

• ±2 LSB Absolute Accuracy

• 65 - 260 µs Conversion Time

• Up to 15 kSPS at Maximum Resolution

• 8 Multiplexed Single Ended Input Channels

• 7 Differential Input Channels

• 2 Differential Input Channels with Optional Gain of 10x and 200x(1)

• Optional Left adjustment for ADC Result Readout

• 0 - V

CC ADC Input Voltage Range

• Selectable 2.56V 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

Note:

1. The differential input channels are not tested for devices in PDIP Package. This fea-

ture is only guaranteed to work for devices in TQFP and MLF Packages

The ATmega16 features a 10-bit successive approximation ADC. The ADC is con-

nected to an 8-channel Analog Multiplexer which allows 8 single-ended voltage inputs

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

The device also supports 16 differential voltage input combinations. Two of the differen-

tial inputs (ADC1, ADC0 and ADC3, ADC2) are equipped with a programmable gain

stage, providing amplification steps of 0 dB (1x), 20 dB (10x), or 46 dB (200x) on the dif-

ferential input voltage before the A/D conversion. Seven differential analog input

channels share a common negative terminal (ADC1), while any other ADC input can be

selected as the positive input terminal. If 1x or 10x gain is used, 8-bit resolution can be

expected. If 200x gain is used, 7-bit resolution can be expected.

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 98.

The ADC has a separate analog supply voltage pin, AVCC. AVCC must not differ more

than ±0.3 V from VCC. See the paragraph “ADC Noise Canceler” on page 206 on how to

connect this pin.

Internal reference voltages of nominally 2.56V or AVCC are provided On-chip. The volt-

age reference may be externally decoupled at the AREF pin by a capacitor for better

noise performance.

ATMEGA16 Datasheet(PDF) 198 Page - ATMEL Corporation

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