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DAC7744: Output noise at power input

Ryu Yamashita

Expert 2020 points

Part Number: DAC7744

Hi team,

Applying ±15V to the VSS and VCC pins of the DAC7744 causes noise in the output waveform.
For VDD and RST, 5V is applied before ±15V.
RSTSEL is connected to the same power supply as VDD.
Is this a specification of the IC?
Is there any possible cause?

Sincerely.
Ryu

over 2 years ago

+1 Paul_Frost over 2 years ago

TI__Guru 53163 points

Hi Ryu,

That looks like power-on glitch. We generally do specify this on newer devices. It does not look like this device has it specified on the datasheet.

Please take a look a this video for an explanation of power on glitch.

https://training.ti.com/ti-precision-labs-dacs-power-on-glitch

Thanks,

Paul

0 Ryu Yamashita over 2 years ago in reply to Paul_Frost

Expert 2020 points

Hi paul,

Thanks for reply.
So you're saying it's an IC specification, right?
I'll try to reduce it by referring to the video.

Sincerely.
Ryu

+1 Akhilesh K over 2 years ago in reply to Ryu Yamashita

TI__Mastermind 18766 points

Hi,

Yes, this is a device specification as Paul mentioned.

Regards,

AK

0 Ryu Yamashita over 2 years ago in reply to Akhilesh K

Expert 2020 points

Hi,

Thanks for reply.
I understood.

Sincerely.
Ryu