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OPA2205: Voltage noise density vs frequency

Takeshi Sasaki
Expert 4480 points
Part Number: OPA2205
Other Parts Discussed in Thread: OPA2206

Hi team,

To confirm, for Figure 6-22 at the datasheet, the caption describes voltage noise density but the y-axis shows current noise density. Also, the Figure 6-22 looks the same with Figure 6-26 as current noise density. Should the Figure 6-22 data be revised as the voltage noise density data as the caption describes? I want to confirm if it is correct data. 

Best regards,

Takeshi Sasaki

  • +1
    TI__Guru* 93105 points

    Sasaki-san,

    The OPA2205 datasheet was just recently released and it looks like there is at least one "bug" that didn't get caught. You are correct about Fig. 6-22, its title states "Voltage Noise Density vs Frequency", but in reality it shows "Current Noise Density vs Frequency." Yes, 6-22 and 6-26 look to be the same graph, but 6-26 is the one having the incorrect labeling.

    The OPA2205 is very similar to the OPA2206. They mostly differ in that the OPA2206 has the internal high-voltage input clamps. Their noise performances are close, with the OPA2205 voltage noise density being a bit lower than the OPA2206. You can get some idea what the OPA2205 voltage noise density curve looks like by viewing the OPA2206, "Figure 6-23. Voltage Noise Density vs Frequency." 

    Meanwhile, I will contact our Systems Engineer about the issue regarding the OPA2205 Voltage Noise Density vs Frequency graph. I am sure it will need to be addressed as soon as possible.

    Thank you for bringing this to our attention,

    Regards, Thomas

    Precision Amplifiers Applications Engineering