ADAU1772 vs ADAU1777 vs ??
We have been evaluating the ADAU1772 for some time now and had the need to find a smaller package preferably just a dual DAC with adjustable output level. Boom I come across the ADAU1777, which seems to be almost identical but in a smaller form factor BGA package. Seems like the ADAU1777 has a few specs that are better. We may not even need the SigmaDSP functionality however we do need to have adjustable ADC input and DAC output level adjustability.
1) Are there versions of these chips without the SigmaDSP, or any other variants I should consider?
2) A dual DAC solution with good audio specs?
3) We had looked at the ADAU1787 but your apps engineer pointed out that that package could be a problem for military applications. Same for 1777?
Datasheet/Specs
ADAU1787
adau1772
ADAU1772 ADAU1777
Integrated/Special Purpose A/D Converters
adau1777
Audio CODECs
Show More
https://www.analog.com/en/products/adau1372.html?tab=documentation-pane-1#product-documentation
The above part has the high-quality ADCs and DACs w/o the DSP core ... you can page through the
complete list of audio codecs here:
https://www.analog.com/en/parametricsearch/13041#/
and if you really only need DACs and not ADCs (it wasn't clear from your post):
https://www.analog.com/en/parametricsearch/11079#/
Good luck,
Thanks for this! Looks like the 1372 is pretty similar to the 1772 except it doesn't have the DSP block or the EEPROM Boot option.
Not much difference in price. This part of the design we just need the two DACs.
Is there a writeup somewhere that describes in more detail the EEPROM boot vs control port configuring each power up? Not my area of design experience. How does a developer go about programming the chip on a product board? With the eval board we don't necessarily know the various registers being set - we are just playing with the gui interface mostly. How does the register data from this best get written to the chip on power up (or one time program to the local EEPROM)? There would be an fpga or processor tied to the chip's control port. We aren't expected to implement the interface for the USB programmer for each chip are we?
I haven't actually used this chip myself so this is just my guess
from a quick look at the datasheet. Basically, you'll need
something (a microcontroller, an FPGA, or an A2B transceiver
passing through) to drive the I2C/SPI port. Distributed throughout
the datasheet is information on how to bring the chip up (System
Clocking and Power-Up on page 25 has pointers to them all),
on page 31 there is a description of bringing up the control
port itself. If you're not building a system that otherwise will
have a microcontroller or FPGA, perhaps it makes sense
to use the 1772 for the EEPROM boot option. Hopefully
someone from ADI will join this thread with a more definitive
response.
Looking over the dedicated audio DACs from ADI, they tend
to fall into two categories -- high channel counts (8/12/16),
or older legacy parts. So unless you're implementing a
high channel count system, you're probably best off with
using codecs and disregarding the ADCs.
Hi bklein,
To answer your posted questions:
1. Both the 1772/1777 have FastDSP cores, which are RISC architectures (reduced-instruction sets), which allow for low latency in regards to utilizing the SigmaStudio GUI to build desired processing algorithms with a trade-off that only allows for 64 instructions for the core. To compare, the SigmaDSP core, like in the ADAU1787 (has both FDSP and SDSP), allows for up to 256 instructions, but is generally slower with a trade-off for the flexibility to handle a larger operation set.
2. The 1777 has dual headphone out drivers as well, which fits the adjustable ADC/DAC level requirement you mentioned.
3. To better understand the issue, what are your package requirements? Getting a better understanding for packaging will definitely help with the recommendation process on our end.
If you have any other questions, or comments, please let us know!
Thanks,
TM
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