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Original question:

TLV320DAC3203: About supply voltages

TLV320DAC3203: need to understand Page 1 / Register 2: LDO Control Register

gustavo zarba
Expert 1160 points

Part Number: TLV320DAC3203

Tool/software:

Hi Ivan,

I am sorry, I still have difficultys to get my board working propperly.

Some things are still not clear for me. I have a working code on the EVAL board and as far as I can see, this is also working on my board. But...

All the signals are there, besides the HPL and HPR signals.

When I connect the mics, the ground becomes noisy and the device is unstable.

I suspect, the way I am handling the power supplys could be the cause. I guess I already sent the 10th HP amplifiers to heaven...

So  first about the supplys I use:

2 volts for IOVDD and LDOin

and 1.8 Volts for DVDD

At the AVDD-Pin I have bypass caps. No external supply on the AVDD-Pin.

So, I need to power up the internal LDO before I disable the weak AVDD, is this correct?

# Select Page 1
w 30 00 01
# Power up AVDD LDO
w 30 02 09
# Disable weak AVDD in presence of external AVDD supply
w 30 01 08

- yes?

Then, I find in the GUI from the EVAL an option for AVDD LDO nominal output, between 1.67 V, 1.72 V and 1.77 V
I cannot find any mention about this "nominal output" on the datasheet or on the applications guide.
What is the purpose of this?

Then, the examples go into
# Enable Master Analog Power Control
w 30 02 00

But by looking into the register, it says by bit D0 and D1:

D0 = 0: AVDD LDO Powered down
D1 = 0: Over Current not detected for AVDD LDO

- Should I leave this command out, or change it to w 30 02 01 ?

- What about the overcurrent detection? I read, this is a feature for the HP outputs.

After this, I do:

# Analog Input Quick Charging Configuration Register - 0x01 / 0x47
w 30 47 32
# Set the REF charging time to 40ms
w 30 7b 01

Then, I set MICBIAS to be = AVDD:

# Set MICBIAS = AVDD = Power Supply
w 30 00 01
w 30 33 00
# Power on MICBIAS
w 30 00 01
w 30 33 60

Is this ok?

And I have a last question:
The EVAL is a 4 lavers board. I am working with a 2 layers board and experience those noise issues. Do you recommend a four layers board for this device?
Since I have to redesign the board, it could be the moment to decide about this.

Best regards,

Gustavo