參數(shù)資料
型號(hào)： EVAL-AD7792EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 22/33頁(yè)
文件大小： 0K
描述： BOARD EVALUATION FOR AD7792
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 470
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF/增益
在以下條件下的電源（標(biāo)準(zhǔn)）： 2.5mW @ 470SPS
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7792
已供物品： 板，CD
相關(guān)產(chǎn)品： AD7792BRU-ND - IC ADC 16BIT 3CH LP 16-TSSOP
AD7792BRUZ-REEL-ND - IC ADC 16BIT 3CH LP 16-TSSOP
AD7792BRUZ-ND - IC ADC 16BIT SIG-DEL 3CH 16TSSOP
AD7792/AD7793
Rev. B | Page 28 of 32
APPLICATIONS INFORMATION
The AD7792/AD7793 provide a low cost, high resolution
analog-to-digital function. Because the analog-to-digital
function is provided by a ∑-Δ architecture, the parts are more
immune to noisy environments, making them ideal for use in
sensor measurement and industrial and process control
applications.
TEMPERATURE MEASUREMENT USING A
THERMOCOUPLE
Figure 20 outlines a connection from a thermocouple to the
AD7792/AD7793. In a thermocouple application, the voltage
generated by the thermocouple is measured with respect to an
absolute reference, so the internal reference is used for this
conversion. The cold junction measurement uses a ratiometric
configuration, so the reference is provided externally.
Because the signal from the thermocouple is small, the
AD7792/AD7793 are operated with the in-amp enabled to
amplify the signal from the thermocouple. As the input channel
is buffered, large decoupling capacitors can be placed on the
front end to eliminate any noise pickup that may be present in
the thermocouple leads. The AD7792/AD7793 have a reduced
common-mode range with the in-amp enabled, so the bias
voltage generator provides a common-mode voltage so that the
voltage generated by the thermocouple is biased up to AVDD/2.
The cold junction compensation is performed using a thermis-
tor in the diagram. The on-chip excitation current supplies the
thermistor. In addition, the reference voltage for the cold
junction measurement is derived from a precision resistor in
series with the thermistor. This allows a ratiometric measure-
ment so that variation of the excitation current has no effect on
the measurement (it is the ratio of the precision reference
resistance to the thermistor resistance that is measured).
04
85
5-
0
12
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
CONTROL
LOGIC
Σ-Δ
ADC
AD7792/AD7793
AIN2(+)
REFIN(+)
REFIN(–)
AIN2(–)
AVDD
GND
MUX
BAND GAP
REFERENCE
INTERNAL
CLOCK
CLK
GND
AVDD
IN-AMP
BUF
REFIN(+) REFIN(–)
VBIAS
AIN1(+)
AIN1(–)
R
THERMOCOUPLE
JUNCTION
C
RREF
IOUT2
Figure 20. Thermocouple Measurement Using the AD7792/AD7793
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7792EBZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:3-Channel, Low Noise, Low Power, 16-/24-Bit ?￡-?? ADC with On-Chip In-Amp and Reference
EVAL-AD7793EB 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk
EVAL-AD7793EBZ 功能描述:BOARD EVALUATION FOR AD7793 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7793EBZ 制造商:Analog Devices 功能描述:EVAL BOARD, AD7793 3CH 24BIT ADC
EVAL-AD7793EBZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:3-Channel, Low Noise, Low Power, 16-/24-Bit ?￡-?? ADC with On-Chip In-Amp and Reference
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