TAS2770: Amplifier board

Hi Jaya,

Is there a package preference for your application?
TAS2770 seem a good match for your requirements. TAS2780 features Y-Bridge which enhances power efficiency by dynamically transitioning from a high voltage rail to low voltage rail based on the input signal amplitude, however it's only available in QFN whereas TAS2770 is both QFN and DSBGA.

Best regards,
-Ivan Salazar
Applications Engineer

Hi Ivan,

Thank you for the prompt support, and I'm sorry for the delay in replying.

QFN will be fine for us, we thought of TAS2770 to proceed with. However, we will consider TAS2780 for this design as you mentioned it is power efficient than the other. Moreover, TAS2770 has a longer lead time, while TAS2780-QFN is readily available.

As we're designing this as an add-on card / daughter PCB to the main carrier board (hosting a Jetsin Nano SoM), we plan to terminate POWER, I2S, and I2C lines using wire-to-board connectors and cables to the Amplifier PCB. We would like to have your recommendations on this aspect as well.

Regards,

Jayasurya

Hi Jayasurya,

Regarding the power lines, I think you can consider adding ferrite or other series filtering on the motherboard side, before taking the cables to the daughtercard, this is independent of the decoupling capacitors close to the IC pins as a general requirement. A proper decoupling on the power voltages should avoid ripples to travel over the connection to the motherboard.

As for the digital signals, I think you may also terminate using series resistors on the motherboard next to the connector going to the daughtercard. Make sure that the same IOVDD and GND reference is shared across the boards.

Best regards,
-Ivan Salazar
Applications Engineer

Hi Ivan,

Thank you very much for your extended support.

Our mother board is designed to take 8V–36V input, with a Buck converter used for subsequent stages. We would like to explore any option to use the same power input (8 V to 36 V) towards the amplifier daughter-card. Is there a single-chip solution that can support such a broad input voltage range? so that we shall avoid a buck converter for the amplifier board. If there isn't a single-chip solution with such a wide input voltage range, how about a DAC and an analogue amplifier?

As our mother board design is almost fixed, making changes to provide series resistors and ferrite bead would be difficult. We've got an EMI filter on the mother board before the buck converter. We've now changed the interconnection from the amplifier board to the motherboard using stacking connectors instead of wire-to-board cables/connectors. Any suggestions on this part would also be helpful.

Regards,
Jayasurya

Hi Jayasurya,

Today is a TI Holiday. Your question will be seen by Ivan tomorrow and you should expect a reply within 48 hours from now.

Please wait to reply unless we have failed to respond to you in a timely manner.

Thank you for your patience,

Jeff McPherson

Hi Jayasurya,

I'm not aware of an amplifier that can support that broad supply voltage range. You may use the filters in this link to add/remove analog or input devices, and you can also filter by supply Max and Min columns. Regardless if it's a digital input amplifiers, or a combination of DAC + analog amplifier, you may need to either consider a higher minimum voltage or lower maximum voltage range.

https://www.ti.com/audio-ic/amplifiers/speaker-amplifiers/products.html#p2982=Analog%20Input;Digital%20Input&p89=Class-D&sort=p2622max;desc

Best regards,
-Ivan Salazar
Applications Engineer