參數(shù)資料
型號： AD7731BR-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 35/44頁
文件大小： 0K
描述： IC ADC 24BIT SIGMA-DELTA 24-SOIC
標(biāo)準(zhǔn)包裝： 1,000
位數(shù)： 24
采樣率（每秒）： 6.4k
數(shù)據(jù)接口： DSP，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 125mW
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： 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-AD7731EBZ-ND - BOARD EVALUATION FOR AD7731
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
SWITCHING
MATRIX
100nA
AGND
100nA
AVDD
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AGND
REF IN (–)
REF IN (+)
AVDD
DVDD
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. The differential output from the transducer is
connected directly to the AIN1/AIN2 input channel. The 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. The application is ratiometric
and variations in the excitation voltage do not introduce errors
in the measurement.
Temperature 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
RTD (Resistive Temperature Device), a PT100. The arrange-
ment is a four-lead RTD configuration. There 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. The voltage differential caused by RL2
and RL3 and the AD7731’s offset current is negligible.
In the application shown, the external 400
A current source
provides the excitation current for the PT100 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.
REV. A
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