DAC38RF82: Start-up Sequence

Kazuhiko Hirano

Genius 14908 points

Part Number: DAC38RF82

Hello,

I have some questions about 9.1.1 Start-up Sequence of the datasheet.

Q1:

Any wait time is required after “PULL TXENABLE” before Provide all 1V supply rails, 1.8V rails and -1.8V rail.”?

Q2:

Can users provide a clock to the differential or single ended clock input before pulling TRSTB pin of the JTAG port low?

Q3:

Any wait time is required after “Toggle RESTB pin low then high (recommended pulse duration >10us)” to “Read SPI Page 0, Register 0x7F”?

Best regards,

K.Hirano

over 6 years ago

0 Neeraj Gill over 6 years ago

TI__Mastermind 20541 points

Hi Kazuhiko,

We are looking at your question and will get back to you.

Regards,

Neeraj

0 Kazuhiko Hirano over 6 years ago in reply to Neeraj Gill

TI__Genius 14908 points

Neeraj,

Thank you for your response.

I look forward to receiving your answers shortly.

Best regards,

K.Hirano

0 Neeraj Gill over 6 years ago

TI__Mastermind 20541 points

A1: No there is no wait time required. All we are suggesting here is the TX pin should be pulled low before the DAC is powered up. This is done to make sure the DAC is not outputting garbage data while it is getting programmed.

A2: No

A3: After the reset pulse I would recommend to insert a 10us delay.

Regards,

Neeraj

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DAC38RF82: Start-up Sequence