(ADA4851-x)Power supply operating range.

Hi !

I have a question about the ADA4851-x's datasheet.

For example Table.1 t Page4 , it says "SPECIFICATIONS WITH +3V SUPPLY" ,

but at the Table.1 it says Operation Range is 2.7V to 12V.

And also the datasheet is written by each supply(+3V,+5V,±5V) but all of the table says

operation range is 2.7V to 12V.

If the operation range is always same , I think there is no reason to separate the table.

But at the datasheet, some of the electrical characteristic is different between the each supply power

so I think the datasheet should say

...for example...

  +3V => 2.7min~3.0typ~3.3max operation range

  +5V => 4min~5.0typ~6max operation range

  ±5V => ±4min~±5.0typ~±6max operation range

kind of this.

So my question is , Is it really 2.7~12V operation range in each supply voltage?

And if this is not correct , can you tell me each min & max supply voltage?

  => for example    2.7~3~3.3 @ +3 SUPPLY

Best regards.

Kawa

  • 0
    •  Analog Employees 
    on Jan 6, 2016 7:12 PM over 5 years ago

    Hi Kawa,

     

    The Table of Specifications: SPECIFICATIONS WITH +3 V SUPPLY, SPECIFICATIONS WITH +5 V SUPPLY and SPECIFICATIONS WITH ±5 V SUPPLY shows the ADA4851 typical performance at supplies +3V, +5V and ±5, respectively. If you notice, with different supply values some (if not all) of the parameter varies, take Slew Rate for example. In the Power Supply Section it says that the operating range is from 2.7 V to 12 V, so the above mentioned supplies are within the specified operation of the device. This means that the minimum supply of operation is 2.7 V and 12 V as maximum supply for proper operation of ADA4851.

     

    Regards,

    Jino

  • The complete answer to your question is rather long, but I will try to clarify some of it. Rest assured, however, that the data sheet is correct in the way it is done.

     

    All integrated circuits will function over a range of supply voltages, but not all ICs will function over a supply voltage range wide as this one. For example, an IC might be specified for operation over 2.7V to 12V, but it is never expected that the performance will be the same at 2.7V at it is at 12V. As a matter of fact, performance can be different at 2.7V, 3.0V and 3.3V, or at 4.75V, 5.0V and 5.25V. A complete data sheet would indicate performance at all common voltages within the range of voltages over which the device will function, as is done with this product. Take a look at the tables and you will see that performance can change with supply voltage. But note that performance does not APPEAR to change much because the conditions are different at each supply voltage.

     

    Suppliers will not generally provide one table for the entire supply range because the performance would not look very good. With different tables for different supply voltages, you can examine these tables and find which supply voltage is best for the parameter that is best for your application and desired conditions. For example, you may find that, while lowest power is with the lowest supply voltage, you might have better noise and better distortion performance with the highest supply voltage. But be careful as you sometimes will see the conditions change at different supply voltages, which may cause the performance to look pretty much the same for all supply voltages when they might be a lot different with identical conditions.

     

    It is also good to know that a product specified to operate with a 5V +/- 10% supply may perform slightly different at 4.5V and at 5.5V than at 5V. This is why it is important to see if the specification tables are specified for, say, 5V or for 5V +/-10%.

     

      Your answer is that this IC will FUNCTION over the supply range of 2.7V to 12V, but performance might vary quite a bit over that range if the other conditions all remain constant. The supplier wants you to know that there is a wide range of supply voltages over which the device will operate, then lets you know performance for specific, common voltages.

  • Hi Jino!

    Hi ngray!

    Thank you for our reply about my question.

    I can understand your almost about our answers but not everything.

    So. I want to discuss about this with my company's FAE team.

    I will answer later about this .

    Best regards.

    Kawa

  • Hi ngray!

    I understood your answer.

    Thank you

    Best regards.

    Kawa