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DDC3256: ADC DDC3256

Hoa Le
Prodigy 20 points

Part Number: DDC3256

Tool/software:

Hi TI,

I have some issues with ADC DDC3256 when sending config via SPI. 

1. This is my schematic with ADC DD3256.

+ Pin TP_SEL to GND 

+ AVDD to 1.85 V

+ VRef to 1.25

2. Send command reset with addr = 0x00 , data 0x0003, But pin SDOUT of ADC DDC3256 not response  , it's always level high.

 

3. Send command set Page Select  = 1 with addr = 0x03 , data = 0x0002,  But pin SDOUT of ADC DDC3256 not response  , it's always level high.

4. and send command read addr = 0x03 But pin SDOUT of ADC DDC3256 does not respond, it's always level high.

==> I don't know, why ADC DDC3256 not response to all commands sent via SPI config. 

who can help me with this?

Thanks

  • 0
    TI__Prodigy 740 points

    Hoa Le,

    Thanks for reaching out!

    I have a few things we can check to verify the device is functioning:

    1. What frequency are you supplying to MCLK?

    2. Can you measure the current consumption of the device at AVDD and verify this matches the datasheet spec? Check this at power-on and after writing 0x0003 to addr 0x00, let me know if the current changes.

    3. After 2, send the SPI commands to the addresses required to power down the device modules, let me know if the current changes.

    Regards,

    Shane