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ADC3244: Using ADC3244 together with STM32F411RET for LIDAR application

Danilo A.
Mastermind 24715 points
Part Number: ADC3244
Other Parts Discussed in Thread: ADC3643, ADC3664, ADC08060, ADC10065

Hi Team,

Our customer will use ADC3244 together with STM32F411RET for LIDAR application. According to the customer,

We think that we need to use ADC to convert analog data to the digital value. We want to check fast ADC or is there any way to analyze the pulse signal? We need to analyze very narrow pulse signal like 50ns pulse signal for LIDAR application. So, the precision is less than 1 ns to get clear information. The signal is coming from receiver side of LIDAR application.

Vpp is approximately 5V.
The signal does not exceed 5V
It will be arranged from 0 to 5V.

This mean is that the signal Vpp can be 5V in close range, but the Vpp of the signal can be 0.5 V in long distance. To get and analyze the information we use STM32f411 series microcontroller. 

He would like to confirm if ADC3244 and STM32F411RET are compatible. If not, kindly suggest a device that would fit his requirements. 

Regards,

Danilo

  • 0
    TI__Genius 12780 points

    Hi Danilo,

    Thanks for bringing this opportunity!

    Quickly looking at the specs for the STM32F411RET, I don't think this will work since the interface is Serial LVDS at 125 MSPS. The actual data rate is 3.5 (serialization factor) * 125 MHz (sample rate) * 2 (DDR) = 875 Mbps. The clock rate of the STM part is 100 MHz, so I don't think this is possible.

    Also, the fullscale range of the ADC3244 is 2Vpp, so the input will need to be attenuated accordingly from 5Vpp with a voltage divider/FDA.

    If I may suggest another part, the ADC3643 family (65 MSPS is released and has an EVM available. 125 MSPS coming later this year.) has a parallel CMOS interface that may be a better fit in terms of lower data rates. Using the ADC3643 on-chip decimation, the data rate can be lowered considerably, so this might be a better fit if looking to interface to a lower cost MCU.

    Please reach out to me via email, and I can offer some additional information.

    Best,

    Dan

  • 0 in reply to dBrock
    TI__Mastermind 24715 points

    Hi Dan,

    Thank you very much for looking into this inquiry. Is the ADC3643 suitable for LIDAR applications based on the customer's requirements above?

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Genius 12780 points

    Hi Danilo,

    Actually, I think they may need a faster sampling rate than ADC3244 or ADC3643/ADC3664 since a 125 MSPS rate is an 8 nanosecond period.

    Here is a reference design using the ADC3244 in a laser TOF application. Hopefully, this will help to answer some questions.

    https://www.ti.com/lit/ug/tiduc73b/tiduc73b.pdf?ts=1623090194776&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDA-01187 

    If they need 1 nano second resolution, they might need to look into one of our GSPS ADCs like the ADC12QJ1600.

    Best,

    Dan

  • 0 in reply to dBrock
    Prodigy 170 points

    Thanks for your interest. We released that 1 ns precision is not possible for our application that the requirement of the IC is needed high speed clock. Therefore, if there is any suitable ADC for 50-100ns pulse signal and STM32F411RET, can you share the suitable ADC?

  • 0 in reply to Ozancan Ugur
    TI__Genius 12780 points

    Hi Ozancan,

    Since the clock of the STM32F411RET is 100 MHz (and I assume at least four clock cycles to store the ADC data in memory), I think that you could probably use an 8-bit ADC that samples at 25 MSPS. Here are my below recommendations for a parallel CMOS output (connecting to the GPIOs of the STM32F411RET), but you must ensure that the STM32F411RET has enough system resources to utilize all of the ADC bits.

    ADC08060 (8 bit, 60 MSPS), ADC10065 (10 bit, 65 MSPS) ADS801 (12 bit, 25 MSPS).

    Best Regards,

    Dan