Z8F082ASH020SC datasheet(126/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

Analog-to-Digital Converter

Z8 Encore! XP® F08xA Series

Product Specification

108

Analog-to-Digital Converter

Overview

The Analog-to-Digital Converter (ADC) converts an analog input signal to its digital rep-

resentation. The features of this sigma-delta ADC include:

• 11-bit resolution in DIFFERENTIAL mode

• 10-bit resolution in SINGLE-ENDED mode

• 8 single-ended analog input sources are multiplexed with general-purpose I/O ports

• 9th analog input obtained from temperature sensor peripheral

• 11 pairs of differential inputs also multiplexed with general-purpose I/O ports

• Differential input gain with two selectable values: unity and 20x

• Transimpedance amplifier for current measurements

• Interrupt upon conversion complete

• Interrupt on sample value greater than programmable high threshold

• Interrupt on sample value smaller than programmable low threshold

• Internal voltage reference generator with three selectable levels

• Manual in-circuit calibration is possible employing user code (offset calibration)

Architecture

Figure 18 illustrates the major functional blocks of the ADC. An analog multiplexer net-

work selects the ADC input from the available analog pins, ANA0 through ANA7.

The input stage of the ADC allows both differential gain and buffering. The following

input options are available:

• Unbuffered input (Single-ended and Differential modes)

• Buffered input with unity gain (SINGLE-ENDED and DIFFERENTIAL modes)

• Buffered input with 20x gain (DIFFERENTIAL mode only)

• Transimpedance mode with full pin access to the feedback path

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