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how do I migrate from adc12d1800 to adc12d1800rf?

Sam Gao
Prodigy 60 points
Other Parts Discussed in Thread: ADC12D1800, ADC12D1800RF

Hi,

we evaluated adc12d1800 in the past. Now we are evaluating adc12d1800rf now. We have some questions,

1. What is the difference between adc12d1800 and adc12d1800rf?

2. Can the users migrate from adc12d1800 to adc12d1800rf without any changes on hardware and software?

3. According to our test, when no signal input, the noise at the output of adc12d1800rf is much higher (+/- 20 bit) than adc12d1800(+/- 8 bit). Does it mean that the performance of new adc12d1800rf on noise is worse than adc12d1800?

Thanks for your help!

Best Regards,

Sam

  • 0
    TI__Mastermind 44680 points

    Hi Sam

    This document describes the key differences from a features and performance viewpoint.

    http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/68/5773.GSPS-ADCs-RF-versus-non-RF.pdf

    At the hardware level no changes are required.

    At the firmware level the key difference is a few of the configuration registers have different POR (power on reset default values) or Required Settings values. Please review the Register Definitions section of each product datasheet to ensure your firmware sets the proper values as necessary for each device.

    Best regards,

    Jim B

     

  • 0 in reply to Jim Brinkhurst1
    Prodigy 60 points

    Hi Jim,

    Thanks a lot for your help!

    I checked the document, and it mainly focuses on the performance enhancement. 

    Could you please send me a document about the changes of firmware?Especially the registers we need to change the value.

    Does the register's value affect the noises of output of the ADC when no input?

    Is there any other customer found the noises performance changes between those two devices?

    Best Regards,

    Sam

  • 0 in reply to Sam Gao
    TI__Mastermind 44680 points

    Hi Sam

    After Power-Up, the device registers will be at the proper value with the following exceptions:

    • For the ADC12D1800 register 6h must be written to 1C00h and then a device calibration performed to ensure the ADC operates at full rated performance.
    • For the ADC12D1800RF register 6h must be written to 1C0Eh and then a device calibration performed to ensure the ADC operates at full rated performance.

    If you are writing to any registers other than register 6h, please ensure the values being set are compatible with the device in use. The register information is provided in each product datasheet. After the device is fully configured, perform an on-command calibration to ensure rated performance.

    SNR of these devices are almost identical, so I don't expect to see a higher level of noise in the ADC12D1800RF versus the ADC12D1800 if the ADCs are being configured correctly and calibrated properly.

    If you continue to see a difference in performance please provide your board schematics, any register values being written, your power-up, configuration and calibration sequence, and a time domain data file for both ADCs.

    Best regards,

    Jim B