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Use of ADS1282evm-pdk in 3=axis geophone application.

user4177188
Prodigy 20 points
Other Parts Discussed in Thread: ADS1256EVM-PDK, ADS1282, ADS1256, ADCPRO

i have an application that requires a data logger (strong motion recorder also known as a blast monitor) for seismic applications. The ADS1282EVM-PDK appears to be the most cost effective for this  application. But the 1286 only has 2 differential inputs. The 3-Axis Geophone has 3 individual two wire geophones with one wire from each geophone connected to a common point. The geophone is a wire coil in a movable magnetic field so it has a sigle wire with two ends. The  simultaneous outputs are required in order to construct the shock wave measurement via a vector summation. I assume  the three AC outputs from the geophones can not be applied as three single ended inputs to the two differential inputs to the 1282. Is there anyway within practical limits to add either a 1282 or 1282EVM to the MB0 board without a complete rewrite of the software. The other application I identified was the ADS1256EVM-PDK with four single ended inputs. However, I do not know if the MB0's for the ADS1282EVM or ADS1256EVM or ADS1210EVM  are plug compatible. With functionality being changed by the supplied downloadable software for each ADS. In other words, can the different ADS EVM modules be interchanged within the same MB0. Any other suggestions for other ADC's  for the application would entertained also. The ultimate data output will be analyzed via Matlab.

  • 0
    TI__Mastermind 44740 points

    Hi user4177188,

    Welcome to the TI E2E Forums!

    The ADS1282 is intended to be paired up with a single geophone. The 2 differential inputs are provided to allow a test signal to be switched into the ADS1282 for system verification as is shown in Figure 70 of the ADS1282 data sheet.

    The ADS1282 (and ADS1256) inputs are multiplexed; therefore, it would not be suitable for two geophone inputs needing to sampled simultaneously. For 3 geophones, you would need three ADS1282's (or ADS1256's) synchronously converting (and sharing the same master clock).

    Either EVM  would allow you to test a single geophone. Unfortunately, we do not have a multichannel EVM that would allow you test 3 geophones. The ADS1282 would be the best device to pair with a multichannel geophone application, because it is low power and offers excellent AC performance. The ADS1256 is better suited for applications that need DC performance.

    Regarding our ADS1282EVMs and ADS1256EVMs, both can use the same MMB0 (independently - they are not stackable). When you connect the EVM and MMB0 to your PC and run ADCPro, the MMB0 will be flashed with the appropriate firmware. The idea of the EVMs is to allow you to test the ADC performance; however, when it comes to prototyping your application, they are very limited.

    Best Regards,
    Chris