Sigma-Delta Analog-To-Digital Converter (Sdadc) Digital Interface - STMicroelectronics SPC572L series Reference Manual

Sigma-Delta Analog-to-Digital Converter (SDADC) Digital Interface

35 Sigma-Delta Analog-to-Digital Converter (SDADC)
Digital Interface
35.1 Introduction
The Sigma-Delta Analog-to-Digital Converter (SDADC) digital interface block controls the
on-chip SDADC and holds control and status registers accessible for application. It provides
accurate conversion data for a wide range of applications.
35.2 Overview
Figure 314
digital interface block provides all control information for operating mode selection (single-
ended or differential), analog input gain, decimation rate, high-pass filter enable, etc. It also
generates the bias controls for common mode voltage selection, to bias the positive and
negative terminals to different voltage levels (for example, half scale bias, reference ground,
reference supply) for diagnostics. It generates the analog multiplexer control signals for the
selected channels. It also provides external modulator support and keeps the internal
modulator in low consumption mode. To assist synchronous operation across multiple ADC
blocks, hardware trigger support is implemented to start data conversion.
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depicts the block diagram of an SDADC and its digital control block. The SDADC
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