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THS2630: What is the key difference between the two very similar parts THS2630 vs. OPA1633

Chia Hung Lai
Prodigy 110 points
Part Number: THS2630
Other Parts Discussed in Thread: OPA1633, OPA1632

I am looking for a single-ended to differential ADC driver.

The input is a single-ended signal span between -12 V & +12 V, frequency up to 25 MHz. I need to convert the +/-12 V input to a fully differential 5 V signal common-mode at +2.5 V for the ADC to sample, of cause I want to preserve the signal as much as possible in term of distortion & noise.

It appears that both THS2630 & OPA1633 (both are PREVIEW part) meet my requirement, but I couldn't figure out the price tag difference of THS2630 that is costing twice as much as OPA1633. Perhaps I missed some important parameter, or I may just stick with OPA1633.

Thanks.

  • 0
    TI__Intellectual 1080 points

    Hi Chia,

    Thank you for considering TI for your design! While the OPA1633 and THS2630 are both fully differential amplifiers within a similar supply voltage range, there are a few key differences to note. 

    • The OPA1633 is a fully-differential amplifier that is designed specifically for audio applications (such as a pre-driver for Class-D amplifiers) and is a new-generation device to the OPA1632. It has an ultra low distortion specification of 0.000026% and an input offset voltage drift typical value of +/- 0.6 μV/ºC. However there is no specified maximum value for Vos, therefore we do not support a maximum value on this specification. Additionally, it has an Iq of 11 mA per channel (typ) and a GBW of 200 MHz. 

    • The THS2630 is a brand new fully-differential amplifier to join our FDA portfolio with a wide range of applications. It has a lower Iq of 8.9 mA per channel (typ) and a higher GBW of 245 MHz. Additionally, this device has a specified voltage offset drift of 3.2 μV/ºC and is therefore a supported specification, which for some customer applications is very important. 

    Both are excellent devices that have been designed specifically to meet a wide range of customer applications and we encourage you to select the device that suits your design needs. 

    Thank you,
    Rachel

  • 0 in reply to Rachel Scheller
    Prodigy 110 points

    Hi Rachel,

    Thanks, I will evaluate both as they are pin-to-pin compatible.

    Do advise when the Spice model of both part will be available, I will run a simulation beforehand to confirm circuit behavior before ordering sample for trial.

    Have a good day.

    Lai CH

  • 0 in reply to Chia Hung Lai
    Guru 140200 points

    Hi Chia,

    keep in mind that right now the datasheet has the status of "advance information". So a lot can still change.

    I think what more counts than the specifications of naked amplifiers is what best suits the ADC. And if you need to build an anti-aliasing filter in combination with a charge bucket filter with the OPAmp, the both amplifiers may relevantly differ in their performance. Important is the final phase margin and the settling time which you can easily simulate once the according SPICE models are published.

    Kai