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:
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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:
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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
PS022815-0206
Analog-to-Digital Converter
ZILOG [ ZILOG, INC. ]
