thanks for replying
The data sheet does not seems to specify that 6 volt range.
http://www.ti.com/lit/ds/symlink/ne5532.pdf
Actually you are right about the 6V.
The TI datasheet, chapter 7.3 and 10, specifies that the recommended range is +/-5V to +/-15V, that is to say, a symmetrical supply spanning from 10v to 30V from Vcc+ to Vcc-, with center GND.
still i checked with 6 volt supply and 1 volt input gives output of 1.423 volts.
regarding common mode voltage limit
where in the data sheet has it been mentioned or is there any way to see it.
Chapter 7.5.
The whole table is valid for for a +15 0 -15 power supply.
Look at rows V
ICR and V
OPP:
The former states that the input range is +/-12V as worst case.
This means that you cannot expect it to work correctly if the input signal ha less than 3V headroom from a supply rail.
In practice, most of the chips will do better, as in your case.
The latter shows that the output swing is, still worst case, 24V; also in this case, assuming the output swing symmetrical with respect to GND and the +/-15V supply we have the same 3V limit.
i tried inputting 0.770 voltage but the output goes high (5 volt output with 6 volt supply)
when i further decrease the input the output voltage is just nearer and nearer to supply rail.
Nice find!
This inversion of output is typical of many op amps (especially older designs). I did not know that the 5532 was also subject to this.