參數資料
型號： EVAL-ADUC824QSZ
廠商： Analog Devices Inc
文件頁數： 26/68頁
文件大?。?/td> 0K
描述： KIT DEV QUICK START ADUC824
標準包裝： 1
系列： QuickStart™ 套件
類型： MCU
適用于相關產品： ADuC824
所含物品： 評估板，線纜，電源，軟件和文檔
REV. B
ADuC824
–32–
Auxiliary ADC
The Auxiliary ADC is intended to convert supplementary inputs
such as those from a cold junction diode or thermistor. This ADC
is not buffered and has a fixed input range of 0 V to 2.5 V
AIN3
AIN4
AIN5
ON-CHIP
TEMPERATURE
SENSOR
SIGMA-DELTA
MODULATOR
PROGRAMMABLE
DIGITAL
FILTER
SIGMA-DELTA A/D CONVERTER
REFIN(–)
REFIN(+)
CHOP
OUTPUT
AVERAGE
OUTPUT
SCALING
DIGTAL OUTPUT
RESULT WRITTEN
TO ADC1H/L SFRs
CHOP
DIFFERENTIAL REFERENCE
THE EXTERNAL REFERENCE INPUT
TO THE ADuC824 IS DIFFERENTIAL
AND FACILITATES RATIOMETRIC
OPERATION. THE EXTERNAL
REFERENCE VOLTAGE IS SELECTED
VIA THE XREF1 BIT IN ADC1CON.
REFERENCE DETECT
CIRCUITRY TESTS FOR OPEN OR
SHORTED REFERENCES INPUTS
SEE PAGE 35
THE MODULATOR PROVIDES A
HIGH FREQUENCY 1-BIT DATA
STREAM (THE OUTPUT OF WHICH
IS ALSO CHOPPED) TO THE
DIGITAL FILTER,
THE DUTY CYCLE OF WHICH
REPRESENTS THE SAMPLED
ANALOG INPUT VOLTAGE
SIGMA DELTA
MODULATOR
SEE PAGE 35
PROGRAMMABLE DIGITAL
FILTER
THE SINC3 FILTER REMOVES
QUANTIZATION NOISE INTRODUCED
BY THE MODULATOR. THE UPDATE
RATE AND BANDWIDTH OF THIS
FILTER ARE PROGRAMMABLE
VIA THE SF SFR
SEE PAGE 35
OUTPUT AVERAGE
AS PART OF THE CHOPPING
IMPLEMENTATION EACH
DATA WORD OUTPUT
FROM THE FILTER IS
SUMMED AND AVERAGED
WITH ITS PREDECESSOR
TO NULL ADC CHANNEL
OFFSET ERRORS
SEE PAGE 36
SIGMA-DELTA ADC
THE SIGMA-DELTA
ARCHITECTURE ENSURES
16 BITS NO MISSING
CODES. THE ENTIRE
SIGMA-DELTA ADC IS
CHOPPED TO REMOVE DRIFT
ERRORS
SEE PAGE 35
THE OUPUT WORD FROM THE
DIGITAL FILTER IS SCALED BY
THE CALIBRATION
COEFFICIENTS BEFORE
BEING PROVIDED AS
THE CONVERSION RESULT
OUTPUT SCALING
SEE PAGE 37
ANALOG INPUT CHOPPING
THE INPUTS ARE ALTERNATELY
REVERSED THROUGH THE
CONVERSION CYCLE. CHOPPING
YIELDS EXCELLENT ADC
OFFSET AND OFFSET DRIFT
PERFORMANCE
SEE PAGE 36
ANALOG MULTIPLEXER
A DIFFERENTIAL MULTIPLEXER
ALLOWS SELECTION OF THREE
EXTERNAL SINGLE ENDED INPUTS
OR THE ON-CHIP TEMP. SENSOR.
THE MULTIPLEXER IS CONTROLLED
VIA THE CHANNEL SELECTION
BITS IN ADC1CON
SEE PAGES 28 AND 33
MUX
Figure 19. Auxiliary ADC Block Diagram
(assuming an external 2.5 V reference). The single-ended inputs
can be driven from AIN3, AIN4, or AIN5 pins or directly from
the on-chip temperature sensor voltage. A block diagram of the
Auxiliary ADC is shown in Figure 19.
相關PDF資料
PDF描述
RPS-1K-22-18/2.0-9 HEAT SHRINK SLEEVE
EBM31DCMN CONN EDGECARD 62POS .156 WW
REC5-243.3DRWZ/H/B CONV DC/DC 5W 9-36VIN +/-3.3V
ADR06WARZ-R7 IC VREF SERIES PREC 3V 8SOIC
EBM31DCMH CONN EDGECARD 62POS .156 WW
相關代理商/技術參數
參數描述
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EVAL-ADUC832QSZ 功能描述:KIT DEV FOR ADUC832 QUICK START RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ 套件 標準包裝:1 系列:PICDEM™ 類型:MCU 適用于相關產品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產品目錄頁面:659 (CN2011-ZH PDF)
EVAL-ADUC834QS 制造商:Analog Devices 功能描述:DATA ACQ SYS, MICROCNVRTR, DUAL 16BIT/24BIT - ADCS W/ EMBEDD - Bulk 制造商:Analog Devices 功能描述:8052 ADUC834 QUICKSTART DEV KIT
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