Low Cost OPAxxxx Solution for Audio Line Driver

Sadanori Kato

Other Parts Discussed in Thread: DRV632, OPA322, OPA134

Hi,

Could you please give us your advice since we would like to replace DRV632 with the low cost audio opamp(OPAxxxx series) ?
We are consider to apply OPAxxxx to the multi-feedback(MFB) with differential input which the pwm modulator outputs are input.
The requirements are shown as below.

<Requirements>
- VCC : 3.0 ~ 3.6V
- diferential input signal : pwm modulator pulse
- load impedance : 5kΩ ~ 10kΩ
- without mute pin
- without shutdown pin
- unity gain stable
- low cost
- filter topology : 2nd-order active low pass filter(multi-feedback)

Best regards,
Kato

over 7 years ago

0 Hooman Hashemi over 7 years ago

TI__Mastermind 22825 points

Hi Kato,
I've moved your post to the Audio Amplifiers forum.

Regards,
Hooman

0 Ivan Salazar over 7 years ago

TI__Guru** 101465 points

Hi Kato-san,

I think you can take a look at my original suggestions like OPA134, OPA322 or one of the OPA16xx amps.
Some of these have TINA TI models or reference designs for testing.

Best regards,
-Ivan Salazar
Texas Instruments

0 Sadanori Kato over 7 years ago in reply to Ivan Salazar

Guru 36520 points

Hi Hooman-san and Ivan-san,

Thank you for your response.

I will consider whether these parts can be applied to the audio line driver by using TINA TI models regarding the parts which you suggested.

Best regards,
Kato

Audio

Audio forum

Low Cost OPAxxxx Solution for Audio Line Driver