This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Avilability of OPAx990 with shutdown

Hi TI, 

We have great interest in your 40V rated small version of OPAx990 with shutdown. We need a single or a dual package. Both are ok. But they have to be small. I can see all the small versions are not ready yet or are they?

We have at least three packages we can use, Can you please reply for each specifically. When are this ready for running production?

OPA2990S RUG

OPA2990S DGS 

OPA990S DBV

POPA990SIDBVR

POPA2990SIDGSR

Please dont generalize the dates, please dont be too optimistic or too pessimistic. We prefer realistic.

Thank you.

Best, Christian

  • Hi Christian,

    The POPA2990SIDGSR is availabe to order in small sample size quantities of our pre-production devices.

    Here are the estimated dates for each device. Please know that the "P" at the beginning of the devices indicates Pre-production material so once the POPA2990S DGS releases it will become the OPA2990S DGS because it is no longer pre-production material.

    OPA2990S DGS - March

    OPA2990S RUG - April

    OPA990S DBV - February

    Thank you,

    Tim Claycomb

  • Hello Tim,

    Ok. Can you assist us little more on this matter. 

    We can see that OPA2990SIDGSR is available for ordering/samples on TI, but that this is not going to be in production before March. However OPA990S DBV is going to be in full production in February but that we cannot get samples of. Is that really the case?

    We have most interest in OPA990S DBV and we need to select a new for amplifier for an ongoing project. First prototype will run in the beginning of Feb. So we need samples and firm confirmation OPA990S is ready. Can you confirm and can we get samples?

    Expected annual usage is around 8000 pcs.

    February is a few weeks away, does this mean OPA990S DBV is already on its way shipping to warehouses?

    Thanks!

    Best, Christian

  • Hi Christian,

    The OPA990S DBV is online now for ordering samples. You can find it here. We are expecting the device to release in February.

    Thank you,

    Tim Claycomb

  • Hi again,

     Ok, very good. Is it very certain that all packages will be introduced or is it not 100%?

    If we design in OPA2990S DGS we need to be very certain that it will be released and go into full production.

    Thanks.

    Best, Christian

  • Hi Christian,

    All packages of the OPAx990S that are available to order pre-production samples will fully release.

    Thank you,

    Tim Claycomb

  • Hello. 

    In datasheet OPA900 your symbol indicates shutdown is inverted/negated but in the chapter explaining shutdown it is specified as active high. Hence contradictive. 

    Which is correct?

    Please correct datasheet. Please do not answer before talking to a development team. We have too often gotten a quick wrong reply.

    Thanks.

    Best, Christian

  • Hi Christian,

    The datasheet is correct as is.

    The pin functions table in section 5 of the datasheet indicates that when the shutdown pin is low the amplifier is enabled and when the shutdown pin is high the amplifier is disabled.

    Section 7.3.11 describes the shutdown circuitry. The section says that the shutdown mode is enabled with the shutdown pin is high. When shutdown mode is enabled the amplifier is disabled.

    Thank you,

    Tim Claycomb

  • Hi again,

    As per your definition above the shutdown mode is active (IC is in shutdown) when the pin is high. 

    Please look at all your symbols in the datasheet. The indicate a negated/inverted input of the shutdown pins, aka that shutdown is active when then pin is low. If in doubt please consult more of your colleagues. 

    The chapter about shutdown is opposite of all drawings. 

    Please look at http://www.ti.com/lit/ds/symlink/opa990.pdf and respond.

    Best, Christian

  • Hi Christian,

    I apologize for this confusion - I believe we are discussing two different facts: 1) the shutdown circuitry can be enabled or disabled, and 2) the amplifier as a whole can be enabled or disabled. These two things are separate but inversely related to each other. When the shutdown circuitry is enabled, the amplifier is disabled; when the shutdown circuitry is disabled, the amplifier is enabled.

    The Pin Functions section only discusses the amplifier's behavior as a whole: when the SHDN pin is a logic low, then the amplifier is enabled; when the SHDN pin is a logic high, then the amplifier is disabled.

    The Shutdown section specifies more nuanced details of the shutdown behavior and discusses both the shutdown circuitry itself in addition to the amplifier behavior. You make a valid point about the symbolization of the SHDN nomenclature in this section - this will be fixed in the next revision of the datasheet. However, this section does not contradict the Pin Functions section - see the middle of the second paragraph of section 7.3.11, "...Thus, to enable the amplifier, the SHDN pins should either be left floating or driven to a valid logic low. To disable the amplifier, the SHDN pins must be driven to a valid logic high." Comparing this to the Pin Functions section, which says "Shutdown: low = amplifier enabled, high = amplifier disabled," it should be clear how the amplifier behaves: low = on, high = off.

  • Dear TI, 

    Your symbols have shutdown pins. These pins are negated/inverted. That is what the lines above the SHDN1 and SHDN2. means. This means that the shutdown function is active when the respective pin is LOW. Hence LOW SHDN1 pin => amplifier output off (high impedance). That is per definition. 

    Your text however describes the opposite. Your text says: Shutdown: low = amplifier enabled.

    Let me give you an example. Another amplifier circuit has a shutdown pin that is not negated. That means when the pin is high the amplifier is in shutdown mode. And when the pin is low the amplifier is on.

    The OPAx990 has inverted shutdown pins => when low the amplifier output is off.

    Again, please look at any other datasheet and respond.

    Best, Christian

  • Please compare shutdown pin datasheet for TVL9001S under table "Pin Functions: TLV9001S" and in datasheet for OPA990S under table "Pin Functions: OPA990S" 

    Please consult a senior engineer. Please take this seriously. We have spent several emails on this matter now. 

  • Hi Christian,

    There are other op amps such as the OPAx316 which follow similar conventions as the OPAx990.

    However, I agree that the specification symbols in the Pin Functions should be adjusted, and as I mentioned previously, these changes will be implemented soon. Regardless, the symbols of the datasheet don't change how the device physically performs, which is described in simple terms in a couple of different places in the datasheet. I'd suggest ordering a few samples of the OPA990S or OPA2990S to confirm this behavior for yourself.

  • TI, Ryan,

    Is this a joke? 

    The way that is depicted is completely wrong. It is never the convention. It is ok to make a mistake, but for somebody's sake just admit it is wrong and change it.

    A negated shutdown pin ALWAYS means that the amplifier is in shutdown mode when the respective pin is low.

    And it is even just opposite of what you have in your earlier low voltage version which is TLV9001S. Try reading the text in the tables I have mentioned. The tables and symbols are completely the same except in one you write enabled and in the other you write disabled.

    Now, are you 100% positive it is not the same as in TLV9001S? Such that a low shutdown pin means off? It would make sense that you have kept the same functionality. Please confirm with somebody that knows about this and then come back:

    Please answer: When the negated shutdown pins of OPAx990 is low is the amplifier on(operating) or off (high impedance output) ? 

  • Hi Christian,

    As I mentioned before, the notation of the overline SHDN in the Pin Functions section will be changed to not have an overline in the next revision of the datasheet. All other references to the SHDN notation in the datasheet do not have an overline and are accurate.

    Additionally, all information describing the behavior of the shutdown functionality in simple language is consistent and accurate. From the Pin Functions section: "low = amplifier enabled, high = amplifier disabled"; from the Shutdown section: "Thus, to enable the amplifier, the SHDN pins should either be left floating or driven to a valid logic low. To disable the amplifier, the SHDN pins must be driven to a valid logic high."

  • Hi Ryan,

    Next time around I would like to invite your colleagues to check the datasheet before replying and further recommend an other approach in general. The first question I posted could have been replied by the below formulation and then the matter would have been resolved right away. Not wasting my time and not wasting your time. Take a look at this:

    Dear Christian, 

    Thanks for discovering this error in the datasheet. It is just a simple copy paste issue from our low voltage version of the amplifier. The shutdown pin is active when high = amplifier is in shutdown mode. We will change it shortly and let you know when the datasheet has been updated. 
    Feel free to let us know if you discover more issues like this, then we can improve the quality of TI documentation together. Thanks and cheers.

    That would have worked so beautifully and the end result would have been the same, just with a happy customer.