TPA2050D4

Lakshmi Santosh

Other Parts Discussed in Thread: TPA2050D4, TPA2054D4A

Can a headphone output from another codec be fed to TPA2050D4 input ? What are the acceptable inputs ? (HP out, Line out, Mic )

Thanks,

Lakshmi

over 12 years ago

0 Lakshmi Santosh over 12 years ago

Intellectual 380 points

Is DVDD on TPA2050D4 strictly 1.8V or can it also be 3.3V ? I see contradictory info in he EVM user guide and the datasheet ? If its 1.8V, I will need to use an I2C level translator for the I2C bus. Please confirm.

Thanks,

0 Don Dapkus over 12 years ago in reply to Lakshmi Santosh

TI__Guru**** 189399 points

Hi, Lakshmi,

The DVDD is limited to a max of 1.95V. SCL/SDA are spec'd for a max of DVDD, thus, the I2C lines must be limited below 1.95V.

If you drive the inputs with the output of a codec, I suggest you put an RC LPF between the two ICs. See the section of the d/s labeled, "OPERATION WITH DACS AND CODECS." This LPF should have a -3 dB point of around 30 kHz.

-d2

0 Lakshmi Santosh over 12 years ago in reply to Don Dapkus

Intellectual 380 points

I thought 1.8V on I2C bus was typo after looking at TPS2050D4A datasheet also. Can you please check and confirm again ? Also, the absolute max specs of DVDD makes me think 1.8V spec is typo.

Thanks,

Lakshmi

0 Don Dapkus over 12 years ago in reply to Lakshmi Santosh

TI__Guru**** 189399 points

Lakshmi,

I think I see the problem! If you're looking at the TPS2050D4A d/s...

Everything I see shows it to be consistently 1.8V. For example, in the terminal description table, it says:

DVDD A4 P I2C supply voltage; connect to 1.8V digital supply

The EVM has it connected to a 1.8V supply...

I think it's 1.8V!

-d2

0 Lakshmi Santosh over 12 years ago in reply to Don Dapkus

Intellectual 380 points

Is TPA2054D4A an active part ? The website says its active, but its not searchable.

Thanks,

Lakshmi

0 Don Dapkus over 12 years ago in reply to Lakshmi Santosh

TI__Guru**** 189399 points

Lakshmi,

It all looks fine to me. Can you try again and let me know if the search doesn't work for you?

-d2

0 Lakshmi Santosh over 12 years ago in reply to Don Dapkus

Intellectual 380 points

Please do a search on ti.com for tpa2050d4a. You will not find the part. It only appears in the catalog search. Another TI engineer also found the same thing.