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LTC2380-24 and LTC2368-24 Multidevice Synchronization?

Category: Hardware
Product Number: LTC2380-24, LTC2368-24

Hello,

Is there a way to synchronize the sampling clock in either the LTC2380-24 or the LTC2368-24?  The application is dictates 3 ADCs be synchronized to the main sampling clock.

Thanks,
Mike

Top Replies

    •  Analog Employees 
    in reply to malee +1 verified

    Hi  

    Each device has independent sampling clock and conversion time, (tconv). The tconv will also vary for each device, since there is a range for minimum and maximum conversion time (Please check the…

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  • Hi  ,

    I'll contact the product owner and get back to you.

    Regards,
    Jo

  • Hi  

    May I know your application for the 3 synchronized ADCs?

    As of now, please read these pages from respective datasheets.

    For LTC2380-24, refer to pages 25-27, (Chain Mode, Multiple Devices)

    For LTC2368-24, refer to pages 24-26, (Chain Mode, Multiple Devices)

    For your additional reference, you may check this link: Introduction to SPI Interface | Analog Devices

    Thank you.

    Regards,

    Red

  • Hello,

    Application is taking 3 channels of ADC and comparing phase of the input signal.  We require the sampling clocks on the ADCs to be in SYNC down to the individual clock.  Does using the convert pin align the internal sampling clocks of individual ADCs?

    Thanks,
    Mike

  • Hi  

    Each device has independent sampling clock and conversion time, (tconv). The tconv will also vary for each device, since there is a range for minimum and maximum conversion time (Please check the datasheet). Hence, considering your application, we cannot guarantee that the 3 independent ADCs will convert simultaneously.

    Please refer to the Normal Mode, Multiple Devices: page 26 for LTC2380-24 and page 25 for LTC2368-24.

    Also take note of these:

    1. The conversion is controlled by CNV. A rising edge on CNV will start a conversion and power up the device. Once a conversion has been initiated, it cannot be restarted until the conversion is complete. 

    2. Since SDO is shared, the RDL/SDI input of each ADC must be used to allow only one LTC2380-24 or LTC2368-24 to drive SDO at a time to avoid bus conflicts.

    3. Both devices have an internal clock that is trimmed to achieve a maximum conversion time.

    May I know your other requirements for your project? I can recommend other Analog Devices, which I think more suitable for an application which requires a multiple channel.

    Please check these links: 

    1. AD7380-4 (Rev. 0) (analog.com): The AD7380-4 is a 16-bit compatible, quad, simultaneous sampling, high speed, successive approximation register (SAR), analog-to-digital converters (ADC) operating from a 3.3 V power supply with throughput rates up to 4 MSPS. The differential analog input accepts a wide common-mode input voltage and is sampled and converted on the falling edge of CS.

    2. AD4630-24/AD4632-24 (Rev. B) (analog.com): The AD4630-24/AD4632-24 are two-channel, simultaneous sampling, Easy DriveTm, 2 MSPS or 500 kSPS successive approximation register (SAR) analog-to-digital converters (ADCs).

    3.AD4858 (Rev. 0) (analog.com): The AD4858 is a fully buffered, 8-channel simultaneous sampling, 20-bit, 1 MSPS data acquisition system (DAS) with differential, wide common-mode range inputs.

    Thank you.

    Kind regards,

    Red

Reply
  • Hi  

    Each device has independent sampling clock and conversion time, (tconv). The tconv will also vary for each device, since there is a range for minimum and maximum conversion time (Please check the datasheet). Hence, considering your application, we cannot guarantee that the 3 independent ADCs will convert simultaneously.

    Please refer to the Normal Mode, Multiple Devices: page 26 for LTC2380-24 and page 25 for LTC2368-24.

    Also take note of these:

    1. The conversion is controlled by CNV. A rising edge on CNV will start a conversion and power up the device. Once a conversion has been initiated, it cannot be restarted until the conversion is complete. 

    2. Since SDO is shared, the RDL/SDI input of each ADC must be used to allow only one LTC2380-24 or LTC2368-24 to drive SDO at a time to avoid bus conflicts.

    3. Both devices have an internal clock that is trimmed to achieve a maximum conversion time.

    May I know your other requirements for your project? I can recommend other Analog Devices, which I think more suitable for an application which requires a multiple channel.

    Please check these links: 

    1. AD7380-4 (Rev. 0) (analog.com): The AD7380-4 is a 16-bit compatible, quad, simultaneous sampling, high speed, successive approximation register (SAR), analog-to-digital converters (ADC) operating from a 3.3 V power supply with throughput rates up to 4 MSPS. The differential analog input accepts a wide common-mode input voltage and is sampled and converted on the falling edge of CS.

    2. AD4630-24/AD4632-24 (Rev. B) (analog.com): The AD4630-24/AD4632-24 are two-channel, simultaneous sampling, Easy DriveTm, 2 MSPS or 500 kSPS successive approximation register (SAR) analog-to-digital converters (ADCs).

    3.AD4858 (Rev. 0) (analog.com): The AD4858 is a fully buffered, 8-channel simultaneous sampling, 20-bit, 1 MSPS data acquisition system (DAS) with differential, wide common-mode range inputs.

    Thank you.

    Kind regards,

    Red

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