你(们)好
以下 TUE 计算是正确的？
FSR (满量程范围)= 2 x 1.467 x Vref = 2 x 1.467 x (VREFP 引脚─VREFN 引脚)
[ ADS1605는 Vref =最大3V 重命令]
= 2 x 1.467 x 3V = 8.802V。 =>因此、ADC 输出代码将 为±4.401V。
1 LSB = FSR/2^16 = 8.802V/65536 = 134.308 uV
偏移误差= 0.05[%FSR]= 0.05/100 x 8.802V = 4.401mV = 4.401mV/134.308uV =±32.77[LSB]
±误差漂移= 1 [ppmFSR/μ ⁰C = 1/10000 [%FSR/μ ⁰C = 1/10000 [%FSR/μ ⁰C x 65⁰C = 0.0065[%FSR]= 0.0065/100 x 8.802V = 0.57213mV= 0.57213mV/134.308uV = 4.26[LSB]。
[ 40⁰C - 25⁰C - 65⁰C |=、、]
±、在40⁰C~85⁰C μ V 的工作温度范围内、最大偏移为±μ V (4.401mV + 0.57213mV)= 4.973mV。
增益误差= 0.25[%]= 0.25/100 x 8.802V = 22.005mV = 22.005mV/134.308 UV =±163.84[LSB]
增益误差漂移= 10[ppm/μ ⁰C = 10/10000[%/μ ⁰C = 10/10000 x 65[%]= 0.065[%]= 0.065/100 x 8.802V = 5.721mV = 5.721mV/134.308uV =±42.60[LSB]
[ 40⁰C - 25⁰C - 65⁰C |=、、]
INL =±0.75[LSB]
DNL =±0.25[LSB]
因此 、TUE = sqrt [(32.77+4.26)^2 +(164.84+42.6)^2 + 0.75^2 + 0.25^2]
= sqrt [37.03^2 + 207.44^2 + 0.75^2 + 0.25^2]
=±210.72[LSB]= 210.72[LSB] x 134.308uV =±28.3mV。
