RM0319 datasheet(257/368 Pages) STMICROELECTRONICS

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RM0319

Analog-to-digital converter (ADC)

Doc ID 022640 Rev 3

257/368

Analog-to-digital converter (ADC)

This chapter focuses on ADC functionality and operation.

For technical details about the programmable registers related to the ADC, refer to the ADC

registers in the following companion document:

●

RM0321: SPEAr320S address map and registers

21.1

Overview

SPEAr320S includes an analog-to-digital converter (ADC), which is connected to the APB

bus.

21.2

Main features

●

Successive approximation conversion method

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10 bit resolution

●

1 MSPS

●

8 analog input (AIN) channels, ranging from 0 to 2.5V

●

For each input, the number of samples to be collected for average calculation can be 1

(no average) or up to 128 as in steps of powers of 2 (2, 4, 8...).

●

INL ± 1 LSB, DNL ± 1 LSB

●

Programmable conversion speed, from a minimum conversion time of 1 µs

●

Normal or enhanced mode. In normal mode the conversion starts upon CPU request,

while in enhanced mode the ADC converts continuously the selected channels

inserting a selectable amount of time between two conversions.

●

DC internal reference voltage is 1.95 (Min), 2.0 (Typ), 2.05 (Max)

Note:

Positive and negative reference voltages can be supplied by dedicated pins to select

different range (Default 0 - 2.5V).

21.3

Functional description

Figure 91 shows the functional block diagram of the ADC.

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