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TLV9062-Q1: questions

Ivy Jin
Expert 3515 points
Part Number: TLV9062-Q1
Other Parts Discussed in Thread: LMP7716-Q1, OPA2317-Q1, OPA2377-Q1, LMV772-Q1, OPA2991-Q1

Tool/software:

Hi Team,

I'm promoting the TLV9062-Q1 to my customer to replace the competitor's solution. Could you please help check below questions?

Below is their test condition.

Vs=5V, IN+=IN-=0-130mV, VCM=0-65mV, Vout=0-3.3V, Gain=25.

Vout=1.67V at IN+=65mV, Vout=3.3V at IN+=130mV, Vout=0V at IN+=0mV.

The customer is concerned that there will be a large error in the output at low IN+.

Based on customer's test condition, may I ask if the offset voltage drift (µV/C) can meet the range of 0.4uV to 1.6uV at TA = –40°C to 125°C? May I know if Vos meets the normal distribution of -500uV to 1000uV at their test condition?

Below is customer's original schematic.

Thanks!

Regards,

Ivy

  • 0
    Guru 286060 points

    Only the "MAX" values in the datasheet are guaranteed.

    The TLV9062-Q1 is a low-cost device. There is no exact replacement for the RS722P. Other low-cost devices would be OPA2377-Q1 or  LMV772-Q1; devices with similar or better characteristics in the VSSOP package would be OPA2317-Q1, LMP7716-Q1, or OPA2317-Q1.

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 29106 points

    Hey Ivy,

    As Clemens has stated above, we do not have a Maximum specification for drift in the datasheet. We specify a typical value, which is typically one standard deviation, and you can statistically estimate how many of your devices will fall out of spec.

    A good discussion on this can be found in the OPA2991-Q1 datasheet in section 6.3.9. I have copied some of it below for convenience.

    The RS722 has a much higher maximum offset voltage of 2.5mV (35% higher than the TLV9062-Q1), and a typical drift that is almost 5x higher than the TLV9062-Q1.

    Assuming the typical specs of RunIC are defined as one standard deviation away from the mean, then the TLV9062-Q1 should perform better than the RS722. Statistically, a drift of 1.6uV/degC is slightly more than 3x the typical, meaning this will cover +/-3σ. This means that 99.73% of devices will fall within this range.

    However, if you are looking for a device with maximum specifications in the datasheet table for drift, you may have a hard time finding these devices, and will need to make an estimation statistically. The devices listed above by Clemens have very low typical drift, therefore you would have to manufacture nearly infinite units to see such a large deviation from the mean. For example, a 10σ event is 1 device every 6.5e22 units, which is an excessive amount of statistical estimation.

    Best,
    Jerry