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Hi,
I'm going to use OPA2670 with +6V and -6V supply. According to the "Pin Configuration" in the data sheet page 2, #4 pin is named "GND".
Q1 : In a case of -Vs=-6V, +Vs=+6V, is this "GND" pin voltage 0V generated by OP2670?
Q2 : If +Vs=+7V and -Vs=-5V, what voltage does the GND pin appear, 0V, +1V, or other voltage?
Q3 : What Is the reference voltage of A0 and A1 ? Does A0=1 mean (-6V+2)V or (GND pin voltage +2)V?
Q4 : Common Mode Input Range SPEC is described as +/-3.5V min. Is this common mode voltage referred to GND pin voltage?
Q5 : I need to use just one OPamp. I don't think all pins of other OPamp are left open. What should I do for other OPamp?
Hello user552018,
1 & 2) The GND pin is an input which you should supply to the OPA2670.
3) Pins A0 and A1 are referenced to the GND pin, so GND+2V.
4) The common mode input range is referenced by the mid-supply of the amp.
5) It is recommended that you connect your unused amplifier in a buffer configuration, and connect your non-inverting pin to your mid-supply.
Best,
Hasan Babiker