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ADC3662: ADC3662 operation w/o digital filter

Part Number: ADC3662
Other Parts Discussed in Thread: , ADC3661

Dear All

we plan to use ADC366x 16 bit dual channel ADC for prototyping. From data sheet it is not understood how we can use ADC without any digital filtering (DDC)/decimation. 

Our interpretation is:

step 1: load register 0x07 bit(7-0): <011 0 1 100> (1-wire, no filtering, pure 16 bit)

step 2: register 0x13 bit(7-0 <0000000 1>

step 3: register 0x13 bit(7-0 <0000000 0>

we detect5 also typo in table 8-19 (wrong address 0x012?!)

  • Hi Thomas,

    I set up the ADC3662EVM in the lab and exported the required register writes to configure the board in 1w, 16b, bypass mode (no decimation). Please find this file at the link below: 

    https://tidrive.ext.ti.com/u/u4pTb1QKU2WpilNq/e8e137c4-b89a-4698-a0a3-cb2eadfe4ea4?l 

    There does appear to be an error in the datasheet in table 8-19 (the address should be 0x13, not 0x12, as you point out). Thank you for bringing this to our attention - we will get this fixed in our next datasheet revision.

    Regards, Amy

  • Dear Amy

    thank you for your fast response. If I summarize your input with the information given in the datasheet registers 0x7 to 0x34 are set to 0x0 after reset and register 0x21 and 0x22 set to 0xf0 / 0xf automatic. Consequently the 1 w, 16b, bypass mode is default after reset ADC3662. A minor point is reg 0x11 bit 0:

    following data sheet for ADC3662 auto-zero is enabled by default ->reg 0x11: 0x01. can you clarify this issue...

    best regards

    Thomas

  • Hi Thomas,

    The default configuration for this part is 1w, 16b, bypass mode. The datasheet mentions that register 0x11 is enabled by default for the ADC3661/2 (Table 8-18). This usually indicates that there is no need to change this register if you would like to use the part default configuration, and the readback will be 0x00. I will double check with the design team that this is the case and get back to you. 

    Regards, Amy

  • Hi Thomas,

    To confirm, after checking with the design team this is the case with register 0x11 for the ADC3661/2 device variants. The Auto Zero (AZ) feature is enabled by default and register 0x11 bit<0> will read 0x00 by default. A register write of 0x01 to address 0x11 would disable the AZ feature. Hope this helps to clarify things.

    Regards, Amy