Part Number: TPA2025D1
I understand that TPA2025 has a fixed gain of 20dB.
Can we use external circuit to reduce the gain? (For example using resistors?)
Objective is to maximise the dynamic range of MCU DAC, especially for low volume settings.
The DAC has a max voltage of ~3V, but with the fixed 20dB gain the amp will max it’s speaker output (~5V) with only 500mV input. That means to get a very low volume setting we’d need to reduce the DAC output waveform voltage to perhaps as low as 50mV, which really reduces our waveform resolution.
Elvar,
Sorry for my late response.
I think your sketch can work for this evaluation. It is similar to the design of our TPA2025D1 Evaluation Module: http://www.ti.com/lit/ug/slou310/slou310.pdf
I would only recommend to ensure that the capacitors footprints could support different sizes for a more confortable evaluation.
Regarding the power stage design, I didn't find anything to modify. It looks fine.
Best regards,
Luis Fernando Rodríguez S.
Part Number: TPA2025D1
Hi Team,
Do we have internal pull-up resistor on TPA2025 EN pin? If we have, what is the pull-up resistor value?
I have a customer requesting guidance on using the TPA2025D1 in single ended mode. The datasheet does not appear to provide information on how to connect the inputs in a single-ended configuration.
Hi, Kato-san,
If you are interested in a mono solution, the TPA2025D1 would be a good solution. In case of a stereo solution, the TPA2012D2 or the TPA2017D2 would be good choices.
Please let me know if these solutions work for you or if you have additional requirements.
Best regards,
Luis Fernando Rodríguez S.
Hi Anthony,
That's really cool!, we have plenty options on the low power amplifier selection, you may take a look to our Audio Selection Tool. Do you prefer a mono or stereo amplifier?, you can take a look to our TPA2025D1, this device features an integrated battery tracking feature that controls the gain to limit battery current at lower battery voltage. TPA2008D2 could be an option as well.
Regards,
-Diego Meléndez López
Audio Applications Engineer
Hi Jerry,
You need to take special care to place the decoupling capacitors close to the IC, sometimes a bad placing of these capacitors leads to malfunction and not recognizing.
Another important thing to take a look is the crystal circuit (C2 and C3) that depends on your crystal impedance.
I would suggest you to better follow the schematic of the User guide (SBAU141).
By the way, I have tested PCM2912A EVM with TPA2025D1 EVM at 4Ohm speaker and it works just fine.
Best regards,
Iván Salazar
Texas Instruments
Hi team,
The left and right channels are controlled separately. When the EN pin is enabled, the power consumption of two tpa2025d1yzgr is reduced > 18mA
I would like to ask what causes it ? Please confirm whether the circuit is wrong? Is it normal? If there is a problem, how to change it?
Best regards
The TAS2552 is a class-D amp therefore both outputs switch between zero V and VBOOST (8.5V). The filtered (analog) signal swings all the way to VBOOST without a load. With a load, it will reduce somewhat (which will result in THD due to the non-linearity. We don't specify the max. swing, we specify the THD+N).
You can drive AVDD and IOVDD from the same rail. Make sure that AVDD is clean. They should powere up at the same time.
The TAS2552 requires a controller. It must be configured via I2C.
ILIM triggers if the current drawn from the output stage exceeds a limit.
If you don't need Isense, an alternative would be the TPA2025D1
