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參數(shù)資料
| 型號(hào)： | ADUC834 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | MicroConverter, Dual 16-/24- Bit ADCs with Embedded 62KB FLASH MCU |
| 中文描述： | MicroConverter的，雙與嵌入62KB閃存MCU 16-/24-位ADC |
| 文件頁數(shù)： | 31/72頁 |
| 文件大小： | 1451K |
| 代理商： | ADUC834 |
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REV.
P
rC (12 March 2002)
ADuC834
–
31
–
PRELIMINARY TECHNICAL DATA
PRIMARY AND AUX ILIARY ADC CIRCUIT DE SCRIPT ION
Overview
T he ADuC834 incorporates two independent sigma-delta ADCs
(Primary and Auxiliary) with on-chip digital filtering intended
for the measurement of wide dynamic range, low frequency
signals such as those in weigh-scale, strain-gauge, pressure trans-
ducer or temperature measurement applications.
Primary ADC
T his ADC is intended to convert the primary sensor input. T he
input is buffered and can be programmed for one of 8 input
ranges from ±20 mV to ±2.56 V being driven from one of three
differential input channel options AIN1/2, AIN3/4, or AIN3/2.
T he input channel is internally buffered allowing the part to
handle significant source impedances on the analog input,
SIGMA-
DELTA
MODULATOR
PROGRAMMABLE
DIGITAL
FILTER
SIGMA-DELTA A/D CONVERTER
BUFFER
AGND
AV
DD
REFIN(-)
REFIN(+)
PROG RAMMABLE GAIN
AMPLIFIER
THE PROGRAMMABLE
GAIN AMPLIFIER ALLOW S
EIGHT UNIPOLAR AND
EIGHT BIPOLAR INPUT
RANGES FROM 20mV TO
2.56V (EXT VREF = +2.5V)
SEE PAGE 33
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 W HICH
REPRESENTS THE SAMPLED
ANALO G INPUT VOLTAGE
SEE PAGE 34
SIGMA-DELTA
MODULATOR
CHOP
ANALOG INPUT CHOPPING
THE INPUTS ARE
ALTERNATELY REVERSED
THROUGH THE
CONVERSION CYCLE.
CHOPPING YIELDS
EXCELLENT ADC OFFSET
AND OFFSET DRIFT
PERFORMANCE
SEE PAGE 36
OUTPUT AVERAGE
AS PART OF THE CHOPPING
IMPLEMENTATION, EACH
DATA W ORD OUTPUT
FROM THE FILTER IS
SUMMED AND AVERAGED WITH
ITS PREDECESSO R
TO NULL ADC CHANNEL
OFFSET ERRORS
SEE PAGE 35
AIN1
AIN2
AIN3
AIN4
BUFFER AMPLIFIER
THE BUFFER AMPLIFIER
PRESENTS A HIGH
IMPEDANCE INPUT STAGE
FOR THE ANALOG INPUTS,
ALLOW ING SIGNIFICANT
EXTERNAL SOURCE
IMPEDANCES
SEE PAGE 33
BURNOUT CURRENTS
TWO 100nA BURNOUT
CURRENTS ALLOW THE
USER TO EASILY DETECT
IF A TRANSDUCER HAS
BURNED OUT OR GONE
OPEN-CIRCUIT
PROGRAMMABLE
DIGITAL FILTER
THE SINC3 FILTER REMOVES
QUANTIZATION NOISE INTRODUCED
BY THE MODULATOR. THE UPDATE
RATE AND BANDW IDTH OF THIS
FILTER ARE PRO GRAMMABLE
VIA THE SF SFR
THE OUPUT W ORD FROM THE
DIGITAL FILTER IS SCALED BY
THE CALIBRATION
COEFFICIENTS BEFORE
BEING PROVIDED AS
THE CONVERSION RESULT
OUTPUT SCALING
ANALOG MULTIPLEXER
A DIFFERENTIAL MULTIPLEXER
ALLOW S SELECTION OF THREE
FULLY DIFFERENTIAL PAIR OPTIONS AND
ADDITIONAL INTERNAL SHORT OPTION
(AIN2
AIN2).THE MULTIPLEXER IS
CONTROLLED VIA THE CHANNEL
SELECTION BITS IN ADC0CON
SEE PAGES 27 AND 33
SIGMA-DELTA ADC
THE SIGMA-DELTA
ARCHITECTURE ENSURES
24 BITS NO MISSING
CODES. THE ENTIRE SIGMA-
DELTA ADC IS
CHOPPED TO REMOVE
DRIFT ERROR
SEE PAGE 35
OUTPUT
AVERAGE
OUTPUT
SCALING
DIGTAL OUTPUT
RESULT W RITTEN
TO ADC0H/M/L SFRs
PGA
DIFFERENTIAL
REFERENCE
THE EXTERNAL REFERENCE
INPUT TO THE ADuC834 IS
DIFFERENTIAL AND
FACILITATES RATIOMETRIC
OPERATION. THE EXTERNAL
REFERENCE VOLTAGE IS SELECT-
ED VIA THE XREF0 BIT
IN ADC0CON.
REFERENCE DETECT
CIRCUITRY TESTS FOR OPEN OR
SHORTED REFERENCES INPUTS
SEE PAGE 34
CHOP
MUX
SEE PAGE 29 AND 34
SEE PAGE 36
SEE PAGE 35
Figure 17. Primary ADC Block Diagram
allowing R/C filtering (for noise rejection or RFI reduction) to
be placed on the analog inputs if required. On-chip burnout
currents can also be turned on. T hese currents can be used to
check that a transducer on the selected channel is still operational
before attempting to take measurements.
T he ADC employs a sigma-delta conversion technique to real-
ize up to 24 bits of no missing codes performance. T he
sigma-delta modulator converts the sampled input signal into a
digital pulse train whose duty cycle contains the digital infor-
mation. A Sinc
3
programmable low-pass filter is then employed
to decimate the modulator output data stream to give a valid
data conversion result at programmable output rates from
5.35 Hz (186.77 ms) to 105.03 Hz (9.52 ms). A Chopping
scheme is also employed to minimize ADC offset errors. A
block diagram of the Primary ADC is shown in Figure 17.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC834_02 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62 kB Flash MCU |
| ADUC834BCP | 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 12.58MHZ 3.3/5V 56LFCSP - Bulk 制造商:Analog Devices 功能描述: |
| ADUC834BCPZ | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:96KB（96K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587 |
| ADUC834BCPZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲(chǔ)器容量:4KB（4K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
| ADUC834BS | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 12.58MHZ 3.3/5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:8BIT MCU +24/16BIT ADC SMD MQFP52 |
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