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STR720 Datasheet(PDF) 332 Page - STMicroelectronics

No. de pieza STR720
Descripción Electrónicos  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
PDF  401 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STR720 Datasheet(HTML) 332 Page - STMicroelectronics

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STR720 - S-D ANALOG/DIGITAL CONVERTER (ADC)
332/401
22
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
1



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