LMH6626: CMIR spec

Hello Tony,

  That is very strange, the datasheet does not have input-common mode range defined. It is not a rail-to-rail device, which means it most likely will not be able to go down to the negative rail. I will confirm this, and get back to you by tomorrow.

   Since you are trying to go down to the negative rail, what are your main specification concerns in order to point you to a device where the input can go down to -VS?

Thank you for pointing this out to us,

Sima

Hello Sima, 

This is very sad news. Thanks for your time, let me know what you find! Just letting you know, this seems like a common problem with a few other datasheets. off the top of my head the LMH6559 i think might also have this problem.

i'm trying to amplify the voltage on a low-side current sense resistor that has very fast transients applied to it. Ideally a minimum of 180V/us slew rate and 1.5GHz GBWP, and as low an offset voltage as possible. i would also take a dual RRIO opamp under 8$ with around or above 120V/us slew rate and 350MHz GBWP, with again as low of an offset voltage as possible. Here's the kicker, though, they have to be able to be powered off a single-ended 12V supply.

thank you :)

-Tony

Hello Tony,

  Thank you for the patience here. We were able to confirm that at single supply, input voltage range is 0.9V to VS+ - 0.2V. I have attached the data in an excel sheet below. It looks like this seems to be an issue with our national acquired device datasheets. We appreciate you for pointing this out to us! 

  For amplifier suggestions for a low-side current sense application:

• Min of 180V/us slew rate, 1.5GHz GBWP, low offset voltage (if not needing RRIO)
  
  • OPA847: 3900MHz, decompensated stable >=12V/V, 0.5mV max offset at 25C
  • LMH6626/LMH6624: 1600MHz, decompensated stable >=7V/V, 0.5mV max offset at 25C
  • OPA2846/OPA846: 1750MHz, decompensated stable >=7V/V, 0.5mV max offset at 25C
• Min 120V/us slew rate, 350MHz GBWP, low offset voltage, RRIO, Cost sensitive, Dual amplifier, 12V single supply
  • This one is a bit more difficult to match all the specs due to the RRIO at >300MHz GBWP :/, here are some suggestions below:
  • LMH6639: 1-channel amplifier, 12V rail, 86MHz GBW, 200V/us slew rate, In to V-, Out, very low-cost
  • OPA2810: 2-channel amplifier, 12V rail, 70MHz GBW, 192V/us slew rate, RRIO, $2.266 | 1ku
    
    
  • OPA365, OPA607, TLV365, OPA863 are the most popular amplifiers for low-side current sensing applications (however the first three are not 12V parts)

  • Specifications	OPA607	OPA863/A	TLV365
    Supply Voltage	2.2 – 5.5 V	2.7 – 12.6 V	2.2 – 5.5 V
    Minimum Stable Gain	6 V/V	1 V/V	1 V/V
    Gain Bandwidth Product (MHz)	50	50	50
    Slew Rate (V/µs)	24	105	27
    Vos @25°C (max)	0.5	1.3 / 0.095	2
    Vos Drift (V/°C) (max)	1.5	4.4 / 1.2	2
    Rail-to-Rail	In to V-, Out	In, Out	In, Out
    IQ (mA)	0.9	0.7	4.6
    Voltage Noise (nV/)	3.8	5.9	4.5
    Package	Single: SOT23 (5) Dual: MSOP-8	Single: SOT23 (5) Dual: SOIC-8	Single: SOT23 (5) Dual: SOIC-8 & MSOP-8

LMH6626 Common Mode and Voltage Output Range.xlsx

Thank you!
Sima