lt1028 datasheet
I often get questions about changing a bipolar supply circuit using positive and negative supplies to a circuit that uses no negative supply. Operational amplifiers do not care whether or not they have a negative supply, but do require a certain range of total supply voltages. However, the input should be near halfway between the two supply voltages, or in the vicinity of +15V with a single +30V supply. However, how close can the input and output get to ground the negative supply pin in this case and the supply voltage and how good are the specifications at low supply voltages? Therefore, the input voltage must be a minimum of ground plus 3V and can not be more than the supply minus 3V and, with a 6V single supply, is constrained to be +3V, period. If you have a single +7V to +15V supply, that single supply can be used and you must bias pin 3 of the NE5534 to a positive voltage. The maximum peak-to-peak output swing of the NE5534 is 24V with /-15V supplies, meaning that the output swing is 6V less than the total supply voltage, so the output can go to 3V from either rail. Assuming we power the NE5534 with a single +15V supply, we find that the maximum output swing is 15V – 3V – 3V 9Vp-p. The range for the bias on the non-inverting input pin of the NE5534 is Minimum Vbias Min Out – Min DAC output current 750 Ohms 3V – 2.3 mA 750 Ohms 1.275V to Maximum Vbias Max Out – Max DAC output current 750 Ohms 12V – 2.3 mA 750 Ohms 4.425V.
lt1028 datasheet
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