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| 型號： | EVAL-AD7714-3EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| 中文描述： | 3 V / 5號第五的CMOS，500微安ADC的信號調理 |
| 文件頁數(shù)： | 36/40頁 |
| 文件大小： | 306K |
| 代理商： | EVAL-AD7714-3EB |
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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 R
L1
and R
L4
but these simply shift the common-
mode voltage. There is no voltage drop across lead resistances
R
L2
and R
L3
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
μ
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 6.25k
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
AV
DD
1
m
A
BUFFER
AV
DD
SERIAL INTERFACE
REGISTER BANK
STANDBY
SYNC
MCLK IN
MCLK OUT
1
m
A
REF IN (+)
REF IN (–)
AGND
DGND
BUFFER
DOUT
DIN
CS
SCLK
POL
DRDY
RESET
DV
DD
AD7714
+5V
400
m
A
AGND
R
L4
R
L3
R
L2
R
L1
RTD
6.25k
V
AIN1
AIN2
A = 1–128
S
M
PGA
Figure 14. RTD Measurement Using the AD7714
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| EVAL-AD7715-3EB | 3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC |
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| EVAL-AD7716EB | Evaluation Board For 22-Bit Data Acquisition System |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7714-3EBZ | 功能描述:BOARD EVAL FOR AD7714 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉換器 (ADC) 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝: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（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| 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)轉換器 (ADC) 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝: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（標準）:- 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 |
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