It seems that our measurement and the contents of the data sheet are not in agreement.
If you may notice, please let me know.
VR=200ohm is used for Fig.30 in the data sheet (page16)
What kind of formula is the scale corresponding to this resistance?
* in the case supply voltage +/-3.3V
If 22-ohms resistance is inserted between AD737-PIN4 and -Vs of schematics in Fig.30 in the data sheet,
Linerity (Fig.14 in the data sheet page.9) will improve.
Actual measurement when following Fig.14 :
Input Voltage 100mV ==> Output difference error +0.3%
Input Voltage 400mV ==> Output difference error -0.4%
* Difference with error 0.7%
When 22-ohms is inserted on Fig.14 :
Input Voltage 100mV ==> Output difference error +0.4%
Input Voltage 400mV ==> Output difference error 0.0%
* Difference with error 0.4%
When inserting 22-ohms in schematics, is there any problem?
And, why does linerity improve?