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參數(shù)資料
| 型號： | EVAL-AD7731EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| 中文描述： | 低噪聲，高吞吐量的24位Σ-Δ模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 40/44頁 |
| 文件大小： | 411K |
| 代理商： | EVAL-AD7731EB |
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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.
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| EVAL-AD7731EBZ | 功能描述:BOARD EVALUATION FOR AD7731 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7732EB | 制造商:Analog Devices 功能描述:2-CHANNEL, ??10 V INPUT RANGE, HIGH THROUGHPUT, 24-BIT ADC |
| EVAL-AD7732EBZ | 功能描述:BOARD EVAL FOR AD7732 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7734EBZ | 功能描述:BOARD EVALUATION FOR AD7734 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7738EB | 制造商:Analog Devices 功能描述:Evaluation Board For AD7738 ADC 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk |
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