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Is is possible to power the PGA205 with 0V and 5V instead of +/- 5V

Matthew Griffith
Prodigy 10 points
Other Parts Discussed in Thread: ADS1259, PGA112, PGA205, PGA280, PGA281

Hello,

I'm using the TI ADS1259 to measure the voltage of a li-ion battery. The ADS1259 datasheet recommended using a PGA 204/205 for an input buffer. I will only be measuring positive voltages. My question is since I'm only using positive voltages can I power the PGA 205 with ground on V- and 5V on V+ instead of -5V on V- and 5V on V+? Does anybody know if that will cause a problem with gain or offset errors?

Thank you for your help,

Matt

  • 0
    TI__Mastermind 27715 points

    Hello Matthew,

    As specified in the PGA205 data sheet, the minimum power supply requirement is ±4.5V, or a total of 9V from V+ to V-. Without this minimum power supply voltage, the device will not turn on. Unfortunately we do not have any comparable programmable-gain instrumentation amplifiers (PGIA) that support single-supply operation. The PGA112 is a single-supply PGA with binary gains, but it is a single-ended input/output device.

    The best choice of a programmable gain instrumentation amplifier for driving the ADS1259 is the PGA280 or PGA281. In fact, they were designed to work together and the ADS1259 data sheet contains extensive information on how to use these devices together effectively.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps