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PGA281: PGA281

Shai Richter
Intellectual 380 points
Part Number: PGA281
Other Parts Discussed in Thread: THP210, PGA206, PGA207

Is there a product like PGA281 that can accept input signals of130Khz as well?

We need a high-precision instrumentation amplifier, for very low input signals.

The secondary requirement is a Programmable Gain Instrumentation Amplifier.

We need first its EVM board.

  • 0
    TI__Guru 52316 points

    Hi Shai,

    Unfortunately,  there is no immediate single IC solution similar to the precision PGA281 for a fully-differential output precision Programmable Gain Amplifier with a higher 130-kHz bandwidth.  As you have mentioned, the PGA281 bandwidth is limited at the higher gains or at the lower attenuation settings.  The small-signal gain vs frequency plot is shown on Figure 16, p9 of the PGA281 datasheet, where the flat region of the frequency response is limited to about ~20-kHz (or ~15-kHz at the higher gain settings conservative).

    The PGA206 and PGA207 are high impedance FET input, precision programable gain amplifier with single-ended output offering a bandwidth of 600-kHz.  The PGA206 offers gains 1, 2, 4, 8V/V and the PGA207 offers gains of 1, 2, 5, 10 V/V.  If a fully-differential output is required, these could be followed by a precision fully-differential amplifier such as the THP210 to further gain the signal and perform the single-ended to differential conversion.  However, immediately, there is no newer single IC device with fully-differential output similar to the PGA281 with higher bandwidth. 

    Thank you and Regards,

    Luis