TLV320AIC3110: Schematic check

Faiz Ahmed78

Part Number: TLV320AIC3110

Hello,

We are using TLV320AIC3110 to drive speakers and a electret condenser mic from a processor and I wanted to get my schematic verified. Could you please take a look and provide any issues/improvements.

The questions I have are:

1) I am providing +1.8V to IOVDD. Would the VPP for MCLK, DOUT, WCLK, DIN, BCLK, RESET, and GPIO1 be 1.8V?

2) I am using VDD_3V3 for my processor as well. Would you recommend a separate supply for AVDD?

Thank you,

Faiz

7183.audio.pdf

over 4 years ago

0 Steve-Wilson over 4 years ago

TI__Mastermind 30030 points

Faiz,

1.yes. All Digital I/O will be 1.8V, including SDA and SCL

2. typically its best to have a separate 3.3V supply. there can be a fair amount of noise on those digital supplies, having a separate analog supply is a good way to keep that supply clean, and performance proper.

regarding your schematic:
1. You have SPRVDD and SPLVSS swapped. (SPRVDD is grounded, and SPLVSS is connected to 5V)
the decoupling caps on SPLVDD and SPRVDD are woefully low. The data sheet recommends the 0.1uf +22uf. on each pin.

2. Mic1RP can be ac coupled to GND with a 0.47uf capacitor. this will keep unwanted noise from coupling in, and prevent any damage to the part in the event the floating pin picks up a large transient.
3. your mic bias resistors are not balanced, is there a reason you did that?
4. If you are not using MICDET, terminate it too GND.

5. if you are concerned about EMI, take a look at the following app note for recommended filters: www.ti.com/.../slaa495.pdf

best regards,
-Steve Wilson