DAC70501: DAC-DATA

Harris Limasi1

Prodigy 150 points

Part Number: DAC70501

Hi,

In the datasheet, the DAC data register description DAC70501: DATA;13:0],0,0

Does this means needs to add two '0' at LSB before the actual 14 bit data ?.

Regards,

Harris

over 1 year ago

0 Akhilesh K over 1 year ago

TI__Mastermind 18546 points

Hi,

For example full scale, 14bits is FFFC

Your understanding is correct

Regards,

0 Harris Limasi1 over 1 year ago in reply to Akhilesh K

Prodigy 150 points

Thanks for the clarification. However i have one more question that is can we change the dac value simply sending the DAC VALUE command or requires to set another register first (use default setting) ?. Thank you.

0 Akhilesh K over 1 year ago in reply to Harris Limasi1

TI__Mastermind 18546 points

Hi,

Can you explain little bit more? I didn't get this question.
It depends on power supply, whether you are using internal or external reference etc.

Can you share your schematics?

regards,

0 Harris Limasi1 over 1 year ago in reply to Akhilesh K

Prodigy 150 points

My circuit using internal reference (but can be configured to use with external reference as well).

If i want to change the dac output, can it be done by simply sending a single command e.g. 1000 0111 1111 1111 1100 ? or we need to set other registers before changing the dac output value ?.

0 Akhilesh K over 1 year ago in reply to Harris Limasi1

TI__Mastermind 18546 points

Hi,

What is the value of VCC Voltage in schematics?

Regards,

0 Harris Limasi1 over 1 year ago in reply to Akhilesh K

Prodigy 150 points

the voltage is 5V

0 Paul_Frost over 1 year ago in reply to Harris Limasi1

TI__Guru 52683 points

Hi Harris,

By default, the device is configured for asynchronous updates. That means that all you need to do is send 24-bit SPI command (register address + Data) to register 0x08. The DAC will update directly.

THanks,

Paul

0 Harris Limasi1 over 1 year ago in reply to Paul_Frost

Prodigy 150 points

Hi Paul .. thanks for the information. However i have one last question is that does the dac spi interface still be able to function properly if i spi signal amplitude is 3.3V (the dac VDD is 5V). ?

+1 Paul_Frost over 1 year ago in reply to Harris Limasi1

TI__Guru 52683 points

Yes, as long as the logic high voltage is greater than the device's specific VIH voltage level.

Thanks,

Paul

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DAC70501: DAC-DATA