Migrating from ADAU1701 to ADAU1401
Hello there, how are you?
Recently I've been requested to change the DSPs from ADAU1701 to ADAU1401 due to the operating temperature range.
Reading the datasheet of the 1401 I couldn't find ANY difference from the datasheet of the 1701. Pins are the same, register map is the same, the datasheets seem to be the same in every word. I honestly find it pretty strange that different ICs could be the very same, except for the temperature range.
Anyway, I am about to make a sample PCB, and I really would like to be 100% sure that I don't need to change anything except put the 1401's. Is that correct? Is there anything I should be worried about regarding the software or the hardware?
I am using the DSPs in SPI mode with a PIC.
Thank you very much.
Audio Signal Processors
adau1401
SigmaDSP Audio Processors
adau1701
Hi Fernando,
It would of course be preferable that an ADI application engineer (or someone who has done the chip swap already) would answer this directly. In the meantime, searching the ADI website for "ADAU1401 ADAU1701" yields some references that indicate that these are indeed form, fit, and function compatible:
This FAQ:
FAQs/RAQs | ADAU1702 | SigmaDSP Processors | Processors and DSP | Analog Devices
This from the ADAU1401A Eval Board Manual:
The EVAL-ADAU1401AEBZ can also be used for evaluation of
the pin-compatible ADAU1701 and ADAU1702 SigmaDSPs.
The differences between the ADAU1401A, ADAU1401,
ADAU1701, and ADAU1702 are:
• The ADAU1701, ADAU1401A, and ADAU1401 have 1024
program RAM locations, while the ADAU1702 has 512
program RAM locations.
• The ADAU1701 has 2k words of data memory, while the
ADAU1702 has 0.5k words of data memory.
Semi manufacturers often produce two or more temperature grades of what amounts to the same chip. In some cases (not necessarily here), chips coming out of the fab are tested, then those that work over the wider temperature range are chosen for that model number.
Best regards,
Bob
Hi,
Out of curiosity I loaded a project compiled for the -1701 into my ADAU1401 board and it worked exactly the same. Got audio into the ADCs, came out the DACs, and the Real-Time Display (which uses I2C) worked as well:
Best regards,
Bob
Hi Fernando,
Did you test your product with -1401s replacing -1701s? How did it work out?
Best regards,
Bob
HI all:
The difference between both is the temperature range and some other automotive qualifification requirements that need to pass.
Regards
Miguel
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