ADRV9002 DAC resolution

Hi HM,

To begin answering your question, I need to correct your second statement: The high-performance ADC is a 5-bit Continuous Time Delta Sigma ADC (CTDS ADC). The low-power ADC is a 16-bit Voltage Controlled Oscillator (VCO) architecture. 

As for the DACs, I'm assuming you mean the DACs present on the Tx datapath? These are 16-bits wide (Please review TRANSMITTER SIGNAL CHAIN - ANALOG FRONT END (AFE) - DAC in the user guide for more details), however there are also Auxiliary DACs/ADCs which are 12-bits wide (please review AUXILIARY CONVERTERS AND TEMPERATURE SENSOR in the user guide for more details)

Thanks,

Oisín.

Hi, Oisin,

Thank you for your support.

I understand the DAC resolution.

I made a mistake in the description of ADC. Thank you for correcting it.

I have another question.

What kind of architecture is the VCO architecture of the LP ADC?

Thanks,

HM

Hi HM,

VCO based ADC's are a particular type of ADC which are designed to be highly digital in nature. This architecture is very useful for on-chip testing and integration into CMOS systems. VCOs themselves are a standard piece of electronics, they output a digital square wave whose frequency is a function of the input voltage. By comparing the output frequency to that of a separate clock reference using digital counters, one can create an all-digital ADC. These circuits are generally liked for their ability to implement simplified versions of high-order Sigma-Delta ADC's, which come with great noise characteristics and a very high dynamic range. Despite the LP ADC's on the ADRV9002 Rx datapath having slightly worse performance than the HP ADC's, you will note that they do have a very large dynamic range and great noise performance.

Unfortunately I struggled to find an article on analog.com which discussed this circuitry, however a quick Google search returned numerous books, papers and articles which discuss this architecture in varying degrees of depth. Here's one block diagram I found of this architecture, available at the following link: https://www.google.com/search?q=VCO+ADC+images&rlz=1C1CHBF_enIE861IE861&sxsrf=ALeKk01ZWgLO9htcJXozFzHpELLDhuVC3Q:1598273010429&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjDpqn47rPrAhVJQxUIHZMaBGAQ_AUoAXoECAwQAw&biw=1920&bih=1089#imgrc=pchazMk5Eb4mgM

I do hope this helps. Thanks very much for your interest.

Best Regards,

Oisín.

Hi, Oisin,

Tahnk you for your useful information.

Regards,

HM

Hi, Oisin,

Tahnk you for your useful information.

Regards,

HM