Please advise ADC device selection.
ADC resolution should be 16bit.
I want to convert 10 Mhz ~ 300Mhz analog frequency to ADC.
Please help by selecting ADC device.
Best Regards, Jame, Shin
Please specify the part number of the device you are using.
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In reply to Yusuf%20Agoro:
I am not sure which part number to choose for the design I want.
With MCU control, the ADC conversion value is first saved as a text file.
Then, the text file is read from the PC program and the result value is displayed in graph form.
The spec I think is below.
ADC conversion time : (min) 1us (max) 0.1us
ADC Conversion rate : (min) 1Msps (max) 10Msps
ADC resolution bit : (min) 12bit (max) 16bit.
ADC input channels : (min) 2 Ch (max) 4Ch
ADC Input Frequency : 10Mhz ~ 300 Mhz
ADC input type : single-Ended
MCU Interface : SPI
There is a difficult part in selecting an ADC device from Ti for search.
Q1> Which of the Precision Vs Highspeed ADC is suitable?
Q2> I don't know what kind of architecture to choose.
i.e) SAR, Delta-Sigma, Pipeline….,
Q3> Please help me choose the ADC device suitable for my application.
In reply to Jame shin:
You will want a high speed ADC capable of supporting your analog input signal frequency. There are many options and trade-offs with respect to performance, cost, and power consumption. There are also different options depending on the digital interface requirements. Based on your information above I will give you a few starting points to investigate for 16-bit resolution devices.
In reply to RJ Hopper:
Thank you for the reply.
From the starting point of 16bit ADC device selection, I am moving forward.
I previously only used the ADC built into the Ti 32bit MCU, but I have a lot of trouble selecting a separate ADC device.
Q1> How do I interface between ADC device(JEDS204B Vs LVDS Parallel) and MCU?
Q2> I would like to create a text file of the results of the ADC acquisition data with the thoughts I prepared for designing the GPR equipment.
The reason is to make development design easy.
Advise your thoughts and ideas.
Q3> I am not free of cost on the ADC device you suggested.
Reduce development specs by one step in cost.
ADC Input Frequency : 10 Mhz ~ 100 Mhz
ADC input channels l : Up to 4Ch(min) ~ 8Ch(max)
Would you please tell the starting point again in selecting ADC device?
Q4> Why can't I use it as a design application with a Precision ADC device?
Shin: Please see below. --RJH
RJH>> Not sure I can answer this. It depends on the capabilities of the MCU and the digital interface options. You mentioned before you used an ADC built in to the MCU. My guess is that ADC must have been a lower sampling rate and lower performing option compared to the recommendations I provided. Typically our high performance ADC interface to an FPGA that is capable of supporting the LVDS or JESD204B interface. If your MCU if fixed, then you will need to work around its capabilities.
RJH>> For prototyping or demo purposes, you can use the TI ADC with the TI capture card (used for evaluation). The corresponding software, HSDC Pro Software, can export captured data to a file.
RJH>> 16b and high speed together will set a price point. You can downgrade the resolution to 14b and then some lower sampling rate options come into play. These devices will be less expensive.
- ADC3241 14b, 25 MSPS, 540 MHz BW, Serial LVDS interface
RJH>> You may be able to and your MCU interface may dictate a Precision ADC. I targeted high speed converters given the nature of the application (radar signals) and the frequency up to 300 MHz.
RJH_A> You may be able to and your MCU interface may dictate a Precision ADC.
I 'm change Precision ADC device the perspective direction.
I searched for Ti devices(Precision ADC).
Q1> Is it possible to convert ADC with ADC input frequency from 10Mhz to 100Mhz below?
Q2> Please advise what to consider about the problem.
Precision ADCs are normally not meant for undersampling applications and the analog bandwidth is usually not too far outside of the sampling frequency. Therefore, the devices you're looking at in the last thread will not be able to undersample a 10MHz - 100MHz signal.
Regards,Collin WellsPrecision ADC Applications
In reply to Collin Wells:
I understand what you say, but please answer the question below.
Collin _A> Precision ADCs…normally not meant...bandwidth is usually not too far outside of the sampling frequency.
Q1> For THS1206 (Precision ADC), the analog input specification is specified in the differential (typ) 96Mhz, single-end (typ)54Mhz data sheet.
What is the bandwidth of THS1206 device?
Q2> Please suggest a device that can convert 10Mhz ~ 100Mhz signal to ADC from Precision ADCs device.
Q3> If the question in Q2> is not answered, please suggest a device to solve.
1.) The THS1206 is on the high end of what's considered a Precision ADC by speed, but by application and operation it's used more like the higher-speed ADCs we'd mentioned before. It does in fact have an analog bandwidth that's higher than the sampling rate and can be used for undersampling.
2.) Does the THS1206 meet your requirements? What you found in the datasheet is correct.
To help my understanding, please answer the question number “Qn> “In response” “An>”.
Collin_1) The THS1206 .. . It does in fact .. analog bandwidth that's higher than the sampling rate and can .. undersampling.
Q1> I am worried that the precision ADC device is not wide bandwidth.
What is the actual THS1206 analog bandwidth range? (single-end & differential)
Collin_2) Does the THS1206 meet your requirements?
A1> No, I need ADC bit 14bit Up to 16bit and Sample rate 1Msps Up to 5Msps (Simultaneous Sampling).
Q2> Please suggest the ADC device recommended for the application.
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