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參數(shù)資料
| 型號(hào)： | AD7714* |
| 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(hào)五的CMOS。 500微安ADC的信號(hào)調(diào)理 |
| 文件頁數(shù)： | 36/40頁 |
| 文件大小： | 306K |
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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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7714ARS-3 | 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| AD7714ARS-5 | 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| AD7714ACHIPS-3 | 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| AD7714ACHIPS-5 | 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| AD7714YN | 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7714ACHIPS-3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| AD7714ACHIPS-5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, CMOS, 500 uA Signal Conditioning ADC |
| AD7714AN-3 | 制造商:Rochester Electronics LLC 功能描述:24-BIT SIGMA DELTA A/D IC - Bulk 制造商:Analog Devices 功能描述: |
| AD7714AN5 | 制造商:ANA 功能描述:24 BIT, 1KSPS, DIP 24 |
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