This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AFE5808A: How to estimate current consumption of AVDD?

Part Number: AFE5808A

Hi.

I am designing ultrasonic sensor system using AFE5808A.

I found, AVDD current consumption increaseed by input amplitude.

I'd like to know maximum current cunsumption of AVDD.

Please inform how to estimate?

Because I have to design power supply system for AFE5808A.

Best Regards,

Masashi Tateshita

  • Thank you for using AFE5808A device.

    Yes, we will look into your question about AVDD power consumption.

    We will let you now soon.

    Thank you!

    Best regards,

    Chen

  • Hi,

    We assume the customer is asking AVDD 3.3V current (notice: there are different such as AVDD_5V, AVDD_ADC_1.8V

    and they are separated.), please refer to the datasheet for all the conditions on

    AFE5808A datasheet page 13

    that is including some defaults sample rate=65MSPS, LPF file, Vcml=0V, Vout=-1dBFS (almost full scale on ADC output),

    and so on.

    Please refer it. If the customer has different test condition,

    then please let us know.

    Thank you!

    Best regards,

    Chen

  • Hi

    I measured current about AVDD3.3.

    Input amplitude        Frequency       Current (only AVDD3.3)

    40mVp-p                  500kHz             0.33A

    300mVp-p                500kHz             0.48A

    1Vp-p                       500kHz             0.78A

    1.6Vp-p                    500kHz             0.8A

    Same signal input to all channel.

    I used TGC mode and low-noise mode.

    How to estimate above value ?

    Best Regards,

    Masashi Tateshita

  • Hi,

    Thank you for your great explanations and measurements.

    Yes, our system engineer will reply your question very soon.

    Thank you!

    Have a nice day!

    Best regards,

    Chen

  • Hi Chen-san,

    Thank you for your support.

    Mr. Tateshita's measurement is on 100% duty sinusoidal input signal from function generator.

    He's checking how much duty cycle and Vpp can be expected in real application.

    In the meantime, do we have a excel calculation sheet or things like that which can help him estimate AVDD current?

    He's also concerned that maximum AVDD 3.3V current under specific input signal is not given in the datasheet. It makes power supply design challenging.

    Actually, he observes approx. 240mA when no signal under TGC mode.

    Thank you and have a nice day too.

    Best Regards,

    Itoh 

  • Hi Itoh-san,

    Thank you so much for your great help to the customer.

    Have a nice day!

    Best regards,

    Chen