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Suggestion for negative Vref

Kaos
on Nov 16, 2016

Dear Sir/Madam,

Our customer is searching the following Vref or precision LDO.

Input: +5V +/-5%, or -5V +/-5%
Output: -4.096V +/-0.1%
Output Current: 18mAmax
Temp.: 0 to 105C

I could not catch this Negative Vref on your web pages.

So do you have the way for this requirement include the small circuit?

Thanks Kaos

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    •  Analog Employees 
    on Nov 18, 2016 7:27 AM

    Hi Kaos,

    We have only two references capable of negative output voltages at this time. These are the AD688 (+/- 10V) and the AD588 (+/- 10V, +/-5V). Neither are capable of a direct -4.096 V output. 

    A simple circuit for generating a negative reference is to connect the output of the reference to an inverting amplifier with a gain of 1. Precision resistors will be required to maintain the overall temperature coefficient of the circuit. See example below.

    I would recommend the ADR45xx for the lowest drift performance and the ADR44x for the lowest noise performance.

    Regards,

    Rob

    adr440 adr4550 vref

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  • 0
    •  Analog Employees 
    on Nov 18, 2016 7:27 AM

    Hi Kaos,

    We have only two references capable of negative output voltages at this time. These are the AD688 (+/- 10V) and the AD588 (+/- 10V, +/-5V). Neither are capable of a direct -4.096 V output. 

    A simple circuit for generating a negative reference is to connect the output of the reference to an inverting amplifier with a gain of 1. Precision resistors will be required to maintain the overall temperature coefficient of the circuit. See example below.

    I would recommend the ADR45xx for the lowest drift performance and the ADR44x for the lowest noise performance.

    Regards,

    Rob

    adr440 adr4550 vref

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