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THS4524 vs. 4x OPA1632

Markus Haag
Prodigy 140 points
Other Parts Discussed in Thread: THS4524, ADS1274, OPA1632, THS4521, ADS1278

Hello,

I have to design a driver for the AD converter ADS1274 to get maximum performance. In the datasheet of the ADC the amplifier THS4524 is recommended. The obvious advantage is the lower price and form-factor, because four amps are in one case. However, the evaluation kit contains 4x OPA1632.

Does the OPA1632 perform better than the THS4524 in this case (my signals are mixed sine waves in the frequency range of 1kHz-20 kHz, linearity is important)?

What else do I have to consider when I have to decide between these two amplifiers?

 

Thanks a lot and best regards,

Markus.

  • 0
    TI__Genius 17905 points

    Hi Markus,

    The ADS1274 was released (with evaluation kit) about a year before the THS4521/2/4 family of parts was released. Had the THS452x family been out at the time, it would probably have been used on the ADS1274 kit. The THS4524 is a great fit for the ADS1274.

    Test data shows that the THS452x does not degrade the total SNR and SFDR performance when driving the ADS1278 (8-ch version of ADS1274). If you look on p. 34 of the THS4524 datasheet (current revision - SBOS458E), you will see some measurements taken with the THS4521 (single version of THS4524) driving the ADS1278. Table 6 shows that the combined performance of the THS4521 and ADS1278 is close to the performance of the ADS1278 alone.

    The OPA1632 can operate on higher, bipolar supplies, but for the input requirements of the ADC, the THS452x running off of a single 5V supply will be more than sufficient. The distortion performance between the two amplifiers at these audio frequencies is comparable, and the THS4524 will be a much lower power (1.1mA/ch) and more compact solution.

     

  • 0 in reply to Kris F
    Prodigy 140 points

    Hi Kristoffer,

    thank you very much! This helps a lot!

    Best regards, Markus.