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參數資料
型號: AD7731BN
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Low Noise, High Throughput 24-Bit Sigma-Delta ADC
中文描述: 6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDIP24
封裝: MS-001, PLASTIC, DIP-24
文件頁數: 40/44頁
文件大小: 411K
代理商: AD7731BN
AD7731
–40–
REV. 0
SIGMA-
DELTA
MODULATOR
CLOCK
GENERATION
AD7731
SERIAL INTERFACE
AND CONTROL LOGIC
REGISTER BANK
DIGITAL
FILTER
SIGMA-DELTA A/D
CONVERTER
BUFFER
PGA
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
RESET
RDY
POL
DGND
EXCITATION VOLTAGE = +5V
S
M
100nA
AGND
100nA
AV
DD
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AGND
REF IN (–)
REF IN (+)
AV
DD
DV
DD
IN+
OUT+
IN–
OUT–
Figure 22. Pressure Measurement Using the AD7731
Pressure Measurement
One typical application of the AD7731 where it is connected
directly to a transducer is in pressure measurement. Figure 22
shows the AD7731 with a pressure transducer in a bridge
arrangement. T he differential output from the transducer is
connected directly to the AIN1/AIN2 input channel. T he entire
circuit is powered from a single +5 V supply that generates the
excitation voltage for the transducer and the power supply, and
reference voltage for the AD7731. T he application is ratiometric
and variations in the excitation voltage do not introduce errors
in the measurement.
T emperature Measurement
Another application area where the transducer can be connected
directly to the AD7731 is in temperature measurement. Figure
23 outlines a connection between a thermocouple and the
AD7731. In order to place the differential voltage from the
AD7731 on a suitable common-mode voltage, the AIN2 input
of the AD7731 is biased up at the reference voltage, +2.5 V.
Figure 24 shows another temperature measurement application
for the AD7731. In this case, the temperature transducer is an
RT D (Resistive T emperature Device), a PT 100. T he arrange-
ment is a four-lead RT D configuration. T here are voltage drops
across lead resistances RL1 and RL4 and across resistor R2 but
these simply shift the common-mode voltage. Resistor R2 is
required to set the common-mode voltage within the allowable
range for the AD7731. T he voltage differential caused by RL2
and RL3 and the AD7731’s offset current is negligible.
In the application shown, the external 400
μ
A current source
provides the excitation current for the PT 100 and it also gener-
ates the reference voltage for the AD7731 via resistor R1. Varia-
tions in the excitation current do not affect the circuit as the
input voltage and the reference voltage vary ratiometrically with
the excitation current. Resistor R1, however, must have a low
temperature coefficient to avoid errors in the reference voltage
over temperature.
相關PDF資料
PDF描述
AD7731BR Low Noise, High Throughput 24-Bit Sigma-Delta ADC
AD7731BRU Low Noise, High Throughput 24-Bit Sigma-Delta ADC
AD7731EB Precision, Zero-Drift Instrumentation Amplifier; Package: SO; No of Pins: 16; Temperature Range: 0°C to +70°C
AD7732 2-Channel, +-10 V Input Range, High Throughput, 24-Bit SIGMA- ADC
AD7732BRU 2-Channel, +-10 V Input Range, High Throughput, 24-Bit SIGMA- ADC
相關代理商/技術參數
參數描述
AD7731BNZ 功能描述:IC ADC 24BIT SIGMA-DELTA 24DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率(每秒):300k 數據接口:并聯 轉換器數目: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) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端,單極;1 個單端,雙極
AD7731BR 功能描述:IC ADC 24BIT 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率(每秒):300k 數據接口:并聯 轉換器數目: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) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端,單極;1 個單端,雙極
AD7731BR-REEL 功能描述:IC ADC 24BIT SIGMA-DELTA 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率(每秒):300k 數據接口:并聯 轉換器數目: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) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端,單極;1 個單端,雙極
AD7731BR-REEL7 功能描述:IC ADC 24BIT SIGMA-DELTA 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率(每秒):300k 數據接口:并聯 轉換器數目: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) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端,單極;1 個單端,雙極
AD7731BRU 功能描述:IC ADC 24BIT SIGMA-DELTA 24TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率(每秒):300k 數據接口:并聯 轉換器數目: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) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端,單極;1 個單端,雙極
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