Z8F021ASH020SC datasheet(132/276 Pages) ZILOG

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PS022815-0206

Analog-to-Digital Converter

Z8 Encore! XP® 4K Series

Product Specification

113

Analog-to-Digital Converter

Overview

The analog-to-digital converter (ADC) converts an analog input signal to its digital repre-

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

• 11-bit resolution in DIFFERENTIAL mode

• 10-bit resolution in SINGLE-ENDED mode

• Eight 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

• Low-power operational amplifier (LPO)

• Interrupt on conversion complete

• Interrupt on sample value greater than programmable high threshold

• Interrupt on sample value smaller than programmable low threshold

• Bandgap generated internal voltage reference with two selectable levels

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

• Factory calibrated for in-circuit error compensation

Architecture

Figure 19 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)

• LPO output with full pin access to the feedback path

Z8F021ASH020SC 数据表(PDF) 132 Page - Zilog, Inc.