STR720 datasheet(332/401 Pages) STMICROELECTRONICS

No de pièce	STR720

Description	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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332 / 401 page

STR720 - S-D ANALOG/DIGITAL CONVERTER (ADC)

332/401

Σ−∆ ANALOG/DIGITAL CONVERTER (ADC)

22.1 Introduction

The ADC is used in STR720 to measure signal strength and other slowly-changing signals.

Four input channels are supported, which can be converted in single channel or round robin

mode.

22.2 Main Features

•

11.5 bits ENOB resolution (Effective Number Of Bits)

•

0 to 2.5V input range

•

4 input channels

•

Oversampling Clock (FMOD) 4 MHz max.

•

Input Bandwidth 977 Hz max.

•

Input Sampling Frequency ( Fs) 1953 Hz max.

•

Conversion time (Ts) = 1/ (FMOD/512)

22.3 Functional Description

The ADC consists of a four-channel single-bit Sigma-Delta modulator with a 512-sample

Sinc3 digital filter and a bandgap voltage reference. A block diagram of the converter is shown

below in Figure 56.

Figure 56. Sigma-Delta Block Diagram

Sinc3

Filter

Σ∆

Modulator

Input1

Output

Reference

Slow_ref

Slow_mod

VCM

VRef

VCM

VRef

Prescaler

Control/

Status

Ch0 Data

Ch2 Data

Ch1 Data

Ch3 Data

Data

Bus

IRQ

Registers

Input2

Input3

Input4

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