參數(shù)資料
型號： EVAL-AD7714-3EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 30/40頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7714
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 1k
數(shù)據(jù)接口： 串行
輸入范圍： 0 ~ 3.3 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 3.65mW @ 3.3 V
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7714-3
已供物品： 板
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更多...
AD7714
REV. C
–36–
RTD Measurement
Figure 14 shows another temperature measurement application
for the AD7714. In this case, the transducer is an RTD (Resis-
tive Temperature Device), a PT100. The arrangement is a 4-
lead RTD configuration. There are voltage drops across the lead
resistances RL1 and RL4 but these simply shift the common-
mode voltage. There is no voltage drop across lead resistances
RL2 and RL3 as the input current to the AD7714 is very low. The
lead resistances present a small source impedance so it would
not generally be necessary to turn on the buffer on the AD7714.
If the buffer is required, the common-mode voltage should be
set accordingly by inserting a small resistance between the bot-
tom end of the RTD and AGND of the AD7714. In the appli-
cation shown an external 400
A current source provides the
excitation current for the PT100 and it also generates the refer-
ence voltage for the AD7714 via the 6.25 k
resistor. Variations
in the excitation current do not affect the circuit as both the
input voltage and the reference voltage vary ratiometrically with
the excitation current. However, the 6.25 k
resistor must have
a low temperature coefficient to avoid errors in the reference
voltage over temperature.
CLOCK
GENERATION
AUTO-ZEROED
MODULATOR
CHARGE BALANCING A/D
CONVERTER
DIGITAL
FILTER
AVDD
1 A
BUFFER
AVDD
SERIAL INTERFACE
REGISTER BANK
STANDBY
SYNC
MCLK IN
MCLK OUT
1 A
REF IN (+)
REF IN (–)
AGND
DGND
BUFFER
DOUT
DIN
CS
SCLK
POL
DRDY
RESET
DVDD
AD7714
+5V
400 A
AGND
RL4
RL3
RL2
RL1
RTD
6.25k
AIN1
AIN2
A = 1–128
SWITCHING
MATRIX
PGA
Figure 14. RTD Measurement Using the AD7714
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7714-5EB 制造商:Analog Devices 功能描述:EVALUATION BOARD - Bulk
EVAL-AD7715-3EB 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
EVAL-AD7715-3EBZ 功能描述:BOARD EVALUATION FOR AD7715 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 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-AD7715-3EBZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 ??A 16-Bit, Sigma-Delta ADC
EVAL-AD7715-5EB 制造商:Analog Devices 功能描述:EVLAUATION BOARD - Bulk
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