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# TLV9002: Input voltage noise of TLV9002 and TLV9062

Part Number: TLV9002
Other Parts Discussed in Thread: TLV9062, TINA-TI

Hi all

Would you mind if we ask TLV9002 and TLV9062?

Comared with TLV9062, TLV9002 is less than input voltage noise despite of big input noise density.
We assume that input voltage noise is input voltage noise.
So, why is TLV9062's input voltage noise inferior to TLV9002's one?

-TLV9002
1. input voltage noise@VS=5V, f=0.1Hz to 10Hz：4.7uVpp
2. input noise density@f=10kHz, VS=5V：27nV/√Hz

-TLV9062
1. input voltage noise＠VS=5V, f=0.1Hz to 10Hz：4.77uVpp
2. input noise density@f=10kHz, VS=5V：10nV/√Hz

Kind regards

Hirotaka Matsumoto

• Hi Hirotaka,

when you run a noise simulation with TINA-TI you will find 5.1µVpp noise for the TLV9002 in the frequency range 0.1Hz to 10Hz. So, I guess the "4.7µVpp" is a typo.

On the other hand, remember that the noise specifications are all typicals and that the noise performance of an OPAmp can show huge manufacturing tolerances...

Kai

• Hello Hirotaka-san,

The TLV9062 and TLV9002 are similar in noise. Most of the numbers and typical charts show TLV9062 is better. TLV9062 on average is marginally better.

0.1Hz to 10Hz noise as a peak voltage is the standard way to express noise. However, it is my opinion that this is a terrible standard. RMS noise voltage would be a much better choice; however nobody asked me when creating the data sheet standard.

If this test was performed over and over again, the Vrms would be similar every time. Vpp over and over would vary sample to sample more. The Vrms of an infinite time measurement would be close in value of any 10 second measurement. The Vpp at output of an infinite time measurement would equal the supply voltage.

Therefore the Vpp value should not be taken too seriously.