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Original question:
Hi team,
Customer wants to use THS4509 to enlarge a singal up to 2.5V, then the singal will go into ADS4225. I find that the min gain of THS4509 is 2(6dB), which will cause THS4509's output up to 5V(exceed ADS4225's range). So I want to seek for a full differential amplifier with smaller gain, maybe 0.25? Could you please suggest one? Thanks!
Nison
Hi Nison,
Thank you for your question. For most of our fully differential amplifiers, the lowest minimum required gain will be 1 V/V, however some can be configured in an attenuator configuration depending on the input bandwidth requirements. Demonstrated below in figure 7-1 is an example of those conditions.
The THS4551 is popular for those attenuator circuits - an example design is shown below and outlined in more detail in Section 10.1.6 Designing Attenuators of the THS4551 datasheet.
If the customer is familiar with the THS4509 and is happy with it, the THS4513 is a similar device but has a lower minimum gain requirement of 1V/V if that is all that is required of the device.
Thank you,
Rachel
