154
9152BINDCO02/10
ATA8743
25. Analog to Digital Converter
25.1 Features
" 10-bit Resolution
" 1.0 LSB Integral Non-linearity
" ?/SPAN> 2 LSB Absolute Accuracy
" 65 - 260 ?/SPAN>s Conversion Time
" Up to 76 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 channels
25.2 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 amplification 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 25-1
on page 155.
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.
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