AD7667 input question

Question

hi all: 
 Looking at the AD7667 datasheet, I have troubles understanding Figure 45. Using the AD7667 in 16-Bit Bipolar and/or Wider Input Ranges. 
 
 Why the op amp can convert &plusmn;10V to 0-2.5V. Should U2 connect the analog input signal to R2 and R3? But the gain is not right. 
 thanks

KirV. · Accepted Answer

Hi lzhang791, 
 If I understand you correctly, you want understand as this circuit convert +/-10 V input range to 0-2.5 V output. You can derive the transfer function of this circuit: 
 General view: V out =V in *k+b, where k is input signal gain, b is constant. 
 In this case: 
 If you don't understand how to do it, I can help you. 
 As result, output range 
 
 I hope this help you. 
 Regards, 
 Kirill)

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AD7667 input question