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TPS7A8101: Measurement environment for noise characteristics

Conor
Mastermind 9570 points
Part Number: TPS7A8101

Hello,

The TPS7A8101 datasheet contains the following description of the noise characteristics.
Low noise: 23.5uVRMS typical (100 Hz to 100kHz)

I am wondering what kind of measuring instrument was used to evaluate these values. I would be grateful if you could tell me how you evaluate the noise of LDOs that are said to be low noise LDOs, as far as you know. It would be even more helpful if you could tell me the model number of the meter.

P.S..
In my research I found a video using a spectrum analyser.
https://www.ti.com/video/4459556475001


Thanks very much,

Conor

  • 0
    TI__Expert 4350 points

    Hi Conor,

    Yes, spectrum analyzers are commonly used to measure noise across frequency. A shield box is required to block environmental noise from getting into the measurement. The LDO is tested inside the closed shield box while the measurement is performed. The spectrum analyzer used in the video you found was a HP 4395A. Newer spectrum analyzers are widely available on the market.

    The noise data points are collected and graphed in the LDO datasheet. Typical Characteristic graphs of noise in TI LDO datasheets start from 10 Hz. In the TPS7A8101 datasheet, the noise graphs go up to 100 kHz. In addition to the graph, we provide the integrated noise (RMS) across a bandwidth of interest. In this datasheet that bandwidth is 100 Hz to 100 kHz. 

    Best,

    Eric