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AD7714ARS-5 参数 Datasheet PDF下载

AD7714ARS-5图片预览
型号: AD7714ARS-5
PDF下载: 下载PDF文件 查看货源
内容描述: 3 V / 5 V , CMOS , 500微安信号调理ADC [3 V/5 V, CMOS, 500 uA Signal Conditioning ADC]
分类和应用: 转换器光电二极管
文件页数/大小: 40 页 / 308 K
品牌: ADI [ ADI ]
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AD7714  
APPLICATIONS  
arranged in a bridge network and gives a differential output  
voltage between its OUT(+) and OUT(–) terminals. With rated  
full-scale pressure (in this case 300 mmHg) on the transducer,  
the differential output voltage is 3 mV/Volt of the input voltage  
(i.e., the voltage between its IN(+) and IN(–) terminals).  
Assuming a 5 V excitation voltage, the full-scale output range  
from the transducer is 15 mV. The excitation voltage for the  
bridge is also used to generate the reference voltage for the  
AD7714. Therefore, variations in the excitation voltage do not  
introduce errors in the system. Choosing resistor values of  
24 kand 15 kas per the diagram give a 1.92 V reference  
voltage for the AD7714 when the excitation voltage is 5 V.  
Using the part with a programmed gain of 128 results in the full  
scale input span of the AD7714 being 15 mV which corresponds  
with the output span from the transducer.  
The on-chip PGA allows the AD7714 to handle an analog input  
voltage range as low as 10 mV full-scale with VREF = +1.25 V.  
The differential inputs of the part allow this analog input range  
to have an absolute value anywhere between AGND and AVDD  
when the part is operated in unbuffered mode. It allows the user  
to connect the transducer directly to the input of the AD7714.  
The programmable gain front end on the AD7714 allows the  
part to handle unipolar analog input ranges from 0 mV to  
+20 mV to 0 V to +2.5 V and bipolar inputs of ±20 mV to  
±2.5 V. Because the part operates from a single supply these  
bipolar ranges are with respect to a biased-up differential input.  
Pressure Measurement  
One typical application of the AD7714 is pressure measure-  
ment. Figure 12 shows the AD7714 used with a pressure trans-  
ducer, the BP01 from Sensym. The pressure transducer is  
+5V  
EXCITATION VOLTAGE = +5V  
DV  
AV  
DD  
DD  
AV  
DD  
IN+  
IN–  
AD7714  
1A  
AIN1  
AIN2  
OUT+  
CHARGE BALANCING A/D  
OUT–  
STANDBY  
CONVERTER  
AUTO-ZEROED  
DIGITAL  
SYNC  
AIN3  
AIN4  
AIN5  
AIN6  
⌺⌬  
PGA  
A = 1–128  
FILTER  
BUFFER  
MODULATOR  
24k⍀  
MCLK IN  
CLOCK  
GENERATION  
1A  
SERIAL INTERFACE  
REGISTER BANK  
MCLK OUT  
AGND  
REF IN (+)  
RESET  
15k⍀  
DRDY  
POL  
REF IN (–)  
AGND  
BUFFER  
DGND  
SCLK  
DOUT  
CS  
DIN  
Figure 12. Pressure Measurement Using the AD7714  
–34–  
REV. C  
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