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:
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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:
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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
PS024705-0405
P R E L I M I N A R Y
Analog-to-Digital Converter
ZILOG [ ZILOG, INC. ]
