參數(shù)資料
型號(hào): AD7714ARS-3REEL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 30/40頁(yè)
文件大?。?/td> 0K
描述: IC ADC 24BIT SIGMA-DELTA 28SSOP
標(biāo)準(zhǔn)包裝: 1,500
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 ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 28-SSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 3 個(gè)差分,單極;3 個(gè)差分,雙極;5 個(gè)偽差分,單極;5 個(gè)偽差分,雙極
配用: EVAL-AD7714-3EBZ-ND - BOARD EVAL FOR AD7714
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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