LTC2380-24 and LTC2368-24 Multidevice Synchronization?

Question

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

ADIApproved · Accepted Answer

Hi malee 
 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 Drive , 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)

ADIApproved · Answer

Hi malee 
 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

ADIApproved · Answer

Hi malee 
 You are welcome. Good to know that you've already decided which device to be used. 
 Thanks. 
 regards, 
 Red

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LTC2380-24 and LTC2368-24 Multidevice Synchronization?

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