Other Parts Discussed in Thread: TLV757P
Hello,
I'm building a TLV320AIC3106 module for my project and I'm somewhat confused about the power supply requirements. We have a lot of things to consider.
- IOVDD (1.8v)
- DVDD (1.8v)
- DRVDD (3.3v)
- AVDD_DAC (3.3v)
- AVDD_ADC (3.3v)
I'm trying to build this with the least possible amount of components for simple, yet effective operation. Sure, I'm trying to get as close to the theoretical SNR as possible within reason. I plan on using two LDOs.
- TLV75733PDBVR (3.3v)
- TLV75718PDBVR (1.8v)
The datasheet makes mention about power supply startup sequencing. Page 93 wants it in this order.
- IOVDD (1.8V)
- AVDD, DRVDD (3.3V)
- DVDD (1.8V)
I kinda figured that the 1.8v LDO will naturally power up faster, and then the 3.3v LDO will power up afterwards naturally. Maybe not. Both LDOs will be connected directly to VIN. I will not cascade the power, for example VIN -> 3.3v -> 1.8v, so that the 1.8v has a better chance of powering first. I have studied the TLV320AIC3106EVM to try and get a handle on the power supply that is built for that module. But I can't get a grasp on exactly how the power up sequencing works on that board. If we need to power DVDD last, how can I delay that startup while still using the same LDO? How many LDOs do I "really" need for powering this part? What's the recommended schematic? Can I just hook up 3.3 and 1.8v to it and call it a day!??
Thanks for your help!
Jay