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參數(shù)資料
| 型號： | AD7714YRZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 30/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT SIGMA-DELTA 24SOIC |
| 標準包裝： | 400 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 1k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 7mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 3 個差分，單極；3 個差分，雙極；5 個偽差分，單極；5 個偽差分，雙極 |
| 配用： | EVAL-AD7714-3EBZ-ND - BOARD EVAL FOR AD7714 |
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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 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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