Datasheet P19/21
BIPOLAR/UNIPOLAR CONFIGURATION
Unipolar and bipolar signals on the AIN1(+) input are referenced to the voltage on the AIN(−) input.
The voltage on AIN2 is referenced to GND.
翻译过来就是说,这颗奇怪的ADC有两套输入:(AIN1+ - AIN-),AIN1-若可接地,此时也就是singer-ended单端输入了;
另一个则是单端对地的输入信号AIN2。
The absolute input voltage in
unbuffered mode includes the range between
GND − 100 mV and VDD + 30 mV resulting
from being unbuffered. The negative absolute input voltage limit
does allow the possibility of monitoring small true bipolar
signals with respect to GND.
这句话看得有点费劲,是说若AIN1处于非缓冲状态,AIN1-可以接GND?还请Primary负责Sigma-Delta的Yaao来帮忙解答。
最后,
AD7124-4是目前中等精度需求场合的24bit Sigma-delta ADC主推型号,坛子里帖很多,FW配置很灵活。
http://www.analog.com/cn/products/analog-to-digital-converters/precision-adc-10msps/ad7124-8.html
Datasheet P19/21
BIPOLAR/UNIPOLAR CONFIGURATION
Unipolar and bipolar signals on the AIN1(+) input are referenced to the voltage on the AIN(−) input.
The voltage on AIN2 is referenced to GND.
翻译过来就是说,这颗奇怪的ADC有两套输入:(AIN1+ - AIN-),AIN1-若可接地,此时也就是singer-ended单端输入了;
另一个则是单端对地的输入信号AIN2。
The absolute input voltage in
unbuffered mode includes the range between
GND − 100 mV and VDD + 30 mV resulting
from being unbuffered. The negative absolute input voltage limit
does allow the possibility of monitoring small true bipolar
signals with respect to GND.
这句话看得有点费劲,是说若AIN1处于非缓冲状态,AIN1-可以接GND?还请Primary负责Sigma-Delta的Yaao来帮忙解答。
最后,
AD7124-4是目前中等精度需求场合的24bit Sigma-delta ADC主推型号,坛子里帖很多,FW配置很灵活。
http://www.analog.com/cn/products/analog-to-digital-converters/precision-adc-10msps/ad7124-8.html
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