ATA8742-PXQW【PDF 154/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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Sheet目录52

150页 151页 152页 153页 [154页]155页 156页 157页 158页

154

9151AINDCO07/09

ATA8742

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

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 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 25-1

on page 155.

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

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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