ADAU1401A power line

takepiro Question

Dec 9, 2011 00:00

Dear support team,

I have a question about power line.

ADAU1401A makes core voltate(1.8V) from 3.3V.

Q1:

If 3.3V power line goes down to arround 2.5V, is core voltage gone down? or does it remain 1.8V?

Q2:

At Q1 situation, if core voltage remains 1.8V, does ADAU1401A need external reset assertion or not?

(when 3.3V lien gose up to 3.3V from 2.5V, does ADAU1401A operation is normal without external reset assertion?)

Best regards,

Takehiro Yabune

adau1401a

Audio Signal Processors

SigmaDSP Audio Processors

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ADIApproved Reply

Dec 13, 2011 00:00

Hello,

In the datasheet, the specifications are defined with the following statement:

Maximum specifications are measured across a temperature range of −40°C to +130°C (case), a DVDD range of 1.62 V to 1.98 V, and an AVDD range of 2.97 V to 3.63 V.

This means that the datasheet specifications are only guaranteed when AVDD is between 2.97 V and 3.63 V. The regulator output is guaranteed to be between 1.7 and 1.84 V for that AVDD range. So, the part has not been characterized with an AVDD of less than 2.97 V. Therefore, I think we cannot guarantee operation at AVDD < 2.97 V.

The datasheet does not indicate a certain minimum level for the guaranteed operation of the device, but it does state that characterization testing goes down to a minimum of 1.7 V for DVDD and 2.97 V for AVDD, so those appear to be the lower limits for our testing.

I’m sorry that the datasheet does not describe this more clearly.

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takepiro Reply

Dec 13, 2011 00:00

Dear Brett-san,

Thank you very much for your supports.

Best regards,

Takehiro Yabune

BrettG <analog@sgaur.hosted.jivesoftware.com>

2011/12/14 03:24

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New message: "ADAU1401A power line"

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ADAU1401A power line

reply from BrettG in SigmaDSP Processors - View the full discussion

Hello,

In the datasheet, the specifications are defined with the following

statement:

Maximum specifications are measured across a temperature range of ?40?C

to +130?C (case), a DVDD range of 1.62 V to 1.98 V, and an AVDD range of

2.97 V to 3.63 V.

This means that the datasheet specifications are only guaranteed when AVDD

is between 2.97 V and 3.63 V. The regulator output is guaranteed to be

between 1.7 and 1.84 V for that AVDD range. So, the part has not been

characterized with an AVDD of less than 2.97 V. Therefore, I think we

cannot guarantee operation at AVDD < 2.97 V.

The datasheet does not indicate a certain minimum level for the guaranteed

operation of the device, but it does state that characterization testing

goes down to a minimum of 1.7 V for DVDD and 2.97 V for AVDD, so those

appear to be the lower limits for our testing.

I’m sorry that the datasheet does not describe this more clearly.

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EZAdministrator Reply

Aug 2, 2018 00:00

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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EZ Admin

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