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TPA6120A2/OPA1622 Difference Between Internal Circuit Topology

Sadanori Kato
Guru 36540 points
Other Parts Discussed in Thread: TPA6120A2, OPA1622

Hi,

Could you please tell us the difference between the internal circuit topology about TPA6120A2 and OPA1622 if possible ?

Best regards,
Kato

  • 0
    TI__Guru** 109395 points
    Hi Kato-san,

    At first glance, the main differences seems to be that the OPA1622 has an additional stage at the output that can be seen at OPA1622 functional block diagram. Another difference is that TPA6120A2 is designed to be able to completely shutdown one channel if it is necessary for lower power consumption. Also I think TPA6120A2 is able to provide higher output current.
    What are your application needs? Are you interested in a particular spec?

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Guru 36540 points

    Hi Ivan-san,

    Thank you for your quick response.
    We are suggesting to replace TPA6120A2 with OPA1622 to our customer for the headphone application.
    So, which of TPA6120A2 and OPA1622 is better for the sound quality if comparing them since their feedback architecture are different ?

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Guru** 109395 points
    Hi Kato-san,

    OPA1622 is a newer device, so it seems that it is a good option for replacement. I will take a deeper look into its specs to see which are the greatest differences between both devices.

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Guru 36540 points

    Hi Ivan-san,

    Thank you for your support.

    Could you please also share the comparison data of the actual measurement for TPA6120A2 and OPA1622 to us if you have it ?

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Guru** 109395 points

    Hi Kato-san,

    I apologize for the delayed response.
    An overall comparison of OPA1622 vs TPA6120A2 is in the following table. OPA1622 is better in almost all specs but output current. Although if output power/current is not a main spec, OPA1622 seems to be a better/newer option.

     

    OPA1622

    TPA6120A2

    Supply voltage

    ±2V to ±18V

    ±5V to ±15V

    THD+N @ 1kHz/32Ω

    -116dB

    -101dB

    Slew rate

    10V/us

    1300V/us

    Crosstalk @ 1kHz

    -140dB

    -105dB

    CMRR

    127dB

    100dB

    Output current

    140mA

    350mA

    Input impedance

    60kΩ

    300kΩ

    Output voltage swing from rail

    Positive rail

    900mV (@600Ω)

    Positive rail

    2.5V (@25Ω)

    Negative rail

    900mV (@600Ω)

    Negative rail

    2.8V (@25Ω)

    Available package

    10 pin VSON

    20 pin HSOP

    14 pin VQFN

    Best regards,
    -Ivan Salazar
    Texas Instruments

  • 0 in reply to Ivan Salazar
    Guru 36540 points

    Hi Ivan-san,

    Thank you for explaining a comparison analysis.
    According to the data sheet I believe that OPA1622 seems to be a better option since it seems that TPA6120A2 doesn't have a short circuit protection.
    Is my understanding correct ?

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Guru** 109395 points
    Hi Kato-san,

    TPA6120A2 have short circuit protection which will limit the output current to 700mA when the output is shorted to GND.
    I think OPA1622 protection works in a similar way but at a lower current level.

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Guru 36540 points

    Hi Ivan-san,

    Thank you for your prompt reply.
    I understood.

    Best regards,
    Kato