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| 型號： | AD7715AR-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC |
| 中文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.300 INCH, MS-013AA, WSOIC-16 |
| 文件頁數(shù)： | 28/31頁 |
| 文件大小： | 474K |
| 代理商： | AD7715AR-3 |
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REV. C
AD7715
–28–
Temperature Measurement
Another application area for the AD7715 is in temperature
measurement. Figure 13 outlines a connection from a thermo-
couple to the AD7715. In this application, the AD7715 is oper-
ated in its buffered mode to allow large decoupling capacitors
on the front end to eliminate any noise pickup which there may
have been in the thermocouple leads. When the AD7715 is
operated in buffered mode, it has a reduced common-mode
range. In order to place the differential voltage from the thermo-
couple on a suitable common-mode voltage, the AIN(–) input of
the AD7715 is biased up at the reference voltage, +2.5V.
Figure 14 shows another temperature measurement application
for the AD7715. 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 AD7715 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 AD7715.
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 AD7715. 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 AD7715 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.
AUTO-ZEROED
MODULATOR
CHARGE BALANCING A/D
CONVERTER
DIGITAL
FILTER
AV
DD
SERIAL INTERFACE
REGISTER BANK
MCLK IN
MCLK OUT
REF IN (+)
REF IN (–)
AGND
DGND
DOUT
DIN
CS
SCLK
DRDY
RESET
DV
DD
AD7715
+5V
AIN (+)
AIN (–)
A = 1–128
PGA
BUFFER
CLOCK
GENERATION
GND
C
C
V
OUT
REF192
THERMOCOUPLE
JUNCTION
+5V
+V
IN
R
R
Figure 13. Thermocouple Measurement Using the AD7715
400
m
A
R
L4
R
L3
R
L2
R
L1
RTD
6.25k
V
AUTO-ZEROED
MODULATOR
CHARGE BALANCING A/D
CONVERTER
DIGITAL
FILTER
AV
DD
SERIAL INTERFACE
REGISTER BANK
MCLK IN
MCLK OUT
REF IN (+)
REF IN (–)
AGND
DGND
DOUT
DIN
CS
SCLK
DRDY
RESET
DV
DD
AD7715
+5V
AIN(+)
AIN(–)
A = 1–128
PGA
BUFFER
CLOCK
GENERATION
Figure 14. RTD Measurement Using the AD7715
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7715AR-3REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 19.2ksps 16-bit Serial 16-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:16 BIT,SIGMA DELTA ADC IC - Tape and Reel |
| AD7715AR5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 muA 16-Bit, Sigma-Delta ADC |
| AD7715AR-5 | 功能描述:IC ADC 16BIT 5V 16-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°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 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7715AR-5REEL | 功能描述:IC ADC 16BIT SIGMA-DELTA 16-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| AD7715ARU-3 | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 19.2ksps 16-bit Serial 16-Pin TSSOP |
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