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LT1013D: Datasheet missing information

Marvn Arcangel
Genius 12575 points
Part Number: LT1013D
Other Parts Discussed in Thread: OPA2196, LT1013

Hi Experts,

Our customer noticed that the datasheet of LT1013D does not seem to have a chart of Vos vs Vcm.

On the datasheet (SLOS018I), Input offset voltage when Vcm = negative supply rail and input bias current as function of Vcm started at Vcm=Vee & going up to Vcc.

Also, Figure 6. Common-Mode Input Voltage vs Input Bias Current is strange, normally this is presented as Ib on vertical plotted against Vcm on horizontal, this chart has these axes flipped.

For clarity, I am looking for the same charts that are published for other TI products, but for the LT1013D. For example, refer to the OPA2196 datasheet SBOS869 –JULY 2017, Figure 1. Offset Voltage vs Common-Mode Voltage. and Figure 4. Input Bias Current vs Common-Mode Voltage.

In addition, there seems to be an error on the product page for the LT1013D, the title is wrong: it states it is a single op-amp, when it is in fact, dual.

Can you help clarify?

Thank you

Regards,

Marvin

  • 0
    TI__Guru* 93105 points

    Hello Marvin,

    I don't know the history of the LT1013D or its datasheet, but it is certainly a legacy op amp so the datasheet information norms today are quite often different from what was included in the datasheets from 1988 and earlier. You are correct, it does not include a graph of input offset voltage (Vio) vs. common-mode voltage. Instead, the Electrical Characteristics table 6.5 provides Common-mode rejection ratio (CMRR) for a VIC = −15 V to 13.5 V, at 25°C, where the specification is 97 dB min and 114 dB typical. That indicates the typical Vio change is  about 2 uV/V and the maximum Vio change will be 14.1 uV/V. The datasheet is the extent of the information we have available for the LT1013D and their isn't any graph.

    The Figure 6, Common-Mode Input Voltage vs Input Bias Current axis are as you stated. The graph would be more correctly presented with IIB on the dependent vertical  axis, and the VIC on the horizontal independent axis. TI has produced the LT1013D on a second-source basis and the graphs and tables appear to have been modeled after those of the first-source.

    "In addition, there seems to be an error on the product page for the LT1013D, the title is wrong: it states it is a single op-amp, when it is in fact, dual." Yes, the product page stating that it is a single is incorrect. The LT1013 datasheet indicating it is a dual op amp is correct. Unfortunately, when the product pages were created this is was a common error made by the creators.

    Regards, Thomas

    Precision Amplifiers Applications Engineering