TI中文支持网看资料没看出个区别
user151383853：
The ADS8343 is a 4-channel, 16-bit sampling Analog-to-Digital (A/D) converter with a synchronous serial interface. Typical power dissipation is 8mW at a 100kHz throughput rate and a +5V supply. The reference voltage (VREF) can be varied between 500mV and VCC/2, providing a corresponding input voltage range of ±VREF. The device includes a shutdown mode which reduces power dissipation to under 15µW. The ADS8343 is ensured down to 2.7V operation.
The ADS8341 is a 4-channel, 16-bit sampling Analog-to-Digital converter (A/D) with a synchronous serial interface. Typical power dissipation is 8mW at a 100kHz throughput rate and a +5V supply. The reference voltage (VREF ) can be varied between 500mV and VCC , providing a corresponding input voltage range of 0V to VREF . The device includes a shutdown mode that reduces power dissipation to under 15µW. The ADS8341 is tested down to 2.7V operation.
Gavin Ye：
回复 user151383853:
ADS8343是真双极性输入？怎么资料是下面红色字体那样写的?如果这里的±VREF是指参考com端的，即com接VREF，然后输入0-2VREF，那为何ADS8341的输入范围不是这样不同样有com端吗?
ABSOLUTE MAXIMUM RATINGS(1)+VCC to GND ……………………………………………………………… –0.3V to +6VAnalog Inputs to GND …………………………………….. –0.3V to +VCC + 0.3VDigital Inputs to GND ………………………………………………….. –0.3V to +6VPower Dissipation ……………………………………………………………….. 250mWMaximum Junction Temperature …………………………………………… +150°COperating Temperature Range ………………………………….–40°C to +85°CStorage Temperature Range …………………………………..–65°C to +150°CLead Temperature (soldering, 10s) ……………………………………….. +300°CNOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”may cause permanent damage to the device. Exposure to absolute maximumconditions for extended periods may affect device reliability.
Gavin Ye：
回复 user151383853:
ADS8343是真双极性输入？怎么资料是下面红色字体那样写的?如果这里的±VREF是指参考com端的，即com接VREF，然后输入0-2VREF，那为何ADS8341的输入范围不是这样不同样有com端吗?
ABSOLUTE MAXIMUM RATINGS(1)+VCC to GND ……………………………………………………………… –0.3V to +6VAnalog Inputs to GND …………………………………….. –0.3V to +VCC + 0.3VDigital Inputs to GND ………………………………………………….. –0.3V to +6VPower Dissipation ……………………………………………………………….. 250mWMaximum Junction Temperature …………………………………………… +150°COperating Temperature Range ………………………………….–40°C to +85°CStorage Temperature Range …………………………………..–65°C to +150°CLead Temperature (soldering, 10s) ……………………………………….. +300°CNOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”may cause permanent damage to the device. Exposure to absolute maximumconditions for extended periods may affect device reliability.
rookiecalf：
回复 Gavin Ye:
一个双极性，一个单极性，不太好比较吧
Gavin Ye：
回复 rookiecalf:
你说的双极性是指真双极性吗?
rookiecalf：
回复 Gavin Ye:
输入量程是一样的VCC，因为要双极性，只能将参考电压变为0.5*VCC，这就是ADS8343的用法改变
Kailyn Chen：
回复 Gavin Ye:
ADS8343这款既可以单端输入也可以差分输入。不知你说的红色字体是什么意思，这里只是说明模拟输入的电压范围
Kailyn Chen：
回复 Kailyn Chen:
ADS8343是双极性输入。
yang li19：
楼主，你的疑问可以通过下面这个图解释。
这里说的输入范围的正负范围是相对于common-mode voltage来说的。common-mode voltage的大小也会影响输入电压的范围。
但是Analog Inputs to GND …………………………………….. –0.3V to +VCC + 0.3V 指的是输入信号的模拟特性，必须在电压轨之内。
yang li19：
回复 Gavin Ye:
这里的双极性不是指模拟信号有0V以下的电压。只是以common-mode volatge为中心上下摆动。
你说的真双极性是想说以0V为中心的双极性，这里不是你想的那种真双极性。
其实极性这个概念本来就是相对的。只是楼主习惯了以0V为中心。
Gavin Ye
你说的双极性是指真双极性吗?
