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Analog to Digital Converter

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jameshleo
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jameshleo
Asked: December 4, 2023In:
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Hi,I trying to do an worst case error estimation in my ADC readings and according to the Datasheet as shown below I’ve other error factors Offset, Full- scale, Absolute Accuracy, DNL, INL.We’re ...Read more

Hi,

I trying to do an worst case error estimation in my ADC readings and according to the Datasheet as shown below I’ve other error factors Offset, Full- scale, Absolute Accuracy, DNL, INL.

We’re trying to mitigate the Offset and Full- scale error by applying a Two-Point Calibration Method.

I would like to know do I need to consider Absolute accuracy as ± 2 even though I’ve compensated Offset and Full-scale error.

Also what about DNL and INL errors do I want to consider both in my calculations and INL is the integral sum of DNL errors.

Also should I consider Typ or Max values what’s the difference between them?

Thank You in Advance

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AccuracyadcCalculationDNLmicrocontrollerrenesasRenesas Microcontroller
  1. vikas Nagpal

    Hello Jameshleo, Thanks for reaching out to the Volt Tech Community. First, the max values for errors defined on the user's manual are the worst error values measured in the laboratory test environment for the full voltage range, while typical is the most usual error value without compensation. UsinRead more

    Hello Jameshleo,
    Thanks for reaching out to the Volt Tech Community.
    First, the max values for errors defined on the user’s manual are the worst error values measured in the laboratory test environment for the full voltage range, while typical is the most usual error value without compensation.
    Using software techniques such as Two- a point calibration system you cancel/ compensate offset and full-scale error.
    In the case of the Renesas specification, the Absolute Accuracy value is the total uncompensated error for all error terms( INL, DNL, Offset, Gain, and Quantization error terms).
    So, you can improve the Absolute Accuracy to be lower than using compensation methods.
    Also, find attached the INL meaning:

    The INL depends on the internal circuit architecture and from any possible distortion, caused by the front-end signal conditioning circuit.
    I hope it helps!
    Regards,
    Vikas Nagpal

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Julian White
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Julian White
Asked: May 25, 2023In:
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Hi, I’m using RF7A6M2AF MCU. I’m working at the register level and don’t use Renesas libraries. I’m trying to set up the MCU so I could spark ADC sampling from GPT. I do have a GPT formerly working in the circle. I ...Read more

Hi,

I’m using RF7A6M2AF MCU. I’m working at the register level and don’t use Renesas libraries. I’m trying to set up the MCU so I could spark ADC sampling from GPT.

I do have a GPT formerly working in the circle. I did set ADTRAUEN to 1 in the GTINTAD register and GTADTRA to 2, so the ADC trigger event starts early on during the GPT up-count. To confirm that the ELC_EVENT_GPT1_AD_TRIG_A event actually happens I’ve configured an interrupt for it and it does get triggered.

The thing I must be missing is the configuration at the ADC level for the trigger. A single checkup from the software trigger is working rightly and I can see ELC_EVENT_ADC1_SCAN_END related interrupt being triggered but if I configure ADCSR register TRGE and EXTRG fields to enable synchronous trigger I can not get ADC to work. I was looking into the ADSTRGR register to set a trigger for the ADC, but I don’t see an option for the GPT.

What am I missing?

Kind regards.

Julian White

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adcadtrauengptmcumicrocontrollersrenesasrf7a6m2af
  1. nidhi singh

    Hello, Thanks for reaching out to Volt Tech Engineering Community. Do you have set the ELSRn to register? For example, ELSR8 register (for ADC unit 0)? You require to set this register with the right value from Table 19.3 according to your preferred GPT channel and event. Thank & Regards

    Hello,

    Thanks for reaching out to Volt Tech Engineering Community.

    Do you have set the ELSRn to register? For example, ELSR8 register (for ADC unit 0)?

    You require to set this register with the right value from Table 19.3 according to your preferred GPT channel and event.

    Thank & Regards

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ashishgawade
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ashishgawade
Asked: February 3, 2023In:
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Hi, I would like to trigger ADC conversion with GPT capture and compares events without using the FSP configuration. I couldn’t figure out how to do it, is there any example project about it? Thank you

Hi,

I would like to trigger ADC conversion with GPT capture and compares events without using the FSP configuration. I couldn’t figure out how to do it, is there any example project about it?

Thank you

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  1. vikas Nagpal

    Hello, It’s easy. see the section, 3 of the manual (RA4M1) To trigger the A/D, write to register ELSR8 (R_ELC. ELSR (8), and the number you write to that register is the event number shown in table 18.3, nearly between 0x57 and 0x96, depending on which timer, which event (and maybe which processor).Read more

    Hello,

    It’s easy. see the section, 3 of the manual (RA4M1)

    To trigger the A/D, write to register ELSR8 (R_ELC. ELSR (8), and the number you write to that register is the event number shown in table 18.3, nearly between 0x57 and 0x96, depending on which timer, which event (and maybe which processor).

    First, you have to enable the ELC registers by writing 1 to R_ELC. ELCR and writing to the module stop register.

    You also have to inform the A/D by writing 9 to ADSTRGR (see section 35.2.12)

    Thank You

    Vikas

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Linto
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Linto
Asked: July 1, 2022In:
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The DA7212 supports 2 Digital mics on MIC1 channel and can support one Analog mic on the MIC2 channel. The datasheet says that the ADC digital filter is shared for the analog/digital mic channels. So either the analog mic or digital ...Read more

The DA7212 supports 2 Digital mics on MIC1 channel and can support one Analog mic on the MIC2 channel.

The datasheet says that the ADC digital filter is shared for the analog/digital mic channels. So either the analog mic or digital mic can use this ADC digital filter

Can I get the Analog Mic ADC data to the I2S without using the ADC digital filter.  If this is possible, then can I add 2 digital microphones on the MIC1 channel( I can do the digital filtering on the Analog mic in my firmware )?

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adcadc digitalanalog micDA7212firmwarei2smic adc data
  1. pallavi sharma

    You can use the AMIC and DMIC, however both will effectively go through the ADC filters. If you enable the ADC_FILTER1, which has the voice and music filters both paths (AMIC, DMIC), will be effected by the filters.

    You can use the AMIC and DMIC, however both will effectively go through the ADC filters.

    If you enable the ADC_FILTER1, which has the voice and music filters both paths (AMIC, DMIC), will be effected by the filters.

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dev krishnan
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dev krishnan
Asked: June 29, 2022In:
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I would like to know the level of Renesas RA2E1 ADC internal reference voltage. Is it fixed or adjustable? What voltage is it?

I would like to know the level of Renesas RA2E1 ADC internal reference voltage.

Is it fixed or adjustable? What voltage is it?

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adcRA2E1renesasRenesas RA2E1 ADCvoltage
  1. Support

    Hi dev , refer below link & download user manual hardware  for RA2E1 & there is table given on page 1003 for  ADC internal reference https://www.renesas.com/us/en/document/man/ra2e1-group-users-manual-hardware Thanks  

    Hi dev ,

    refer below link & download user manual hardware  for RA2E1 & there is table given on page 1003 for  ADC internal reference

    https://www.renesas.com/us/en/document/man/ra2e1-group-users-manual-hardware

    Thanks

     

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