Frequently asked questions about µmodule data acquisition solutions.
Q: Can a customer achieve the same level of performance using a discrete design?
A: Yes, but it will result in slower time to market as R&D would need to go through the rigorous design process - signal chain component selection, prototyping (optimization and calibration), and characterization.
Additionally, the equivalent discrete solution will occupy more space on the PCB – which can be freed up if a µModule is selected.
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Q: Are bypass capacitors needed for decoupling of the µModule supply pins?
A: No, all capacitors needed to decouple the µModule supply pins are integrated inside the micromodule.
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Q: Is there a power-up sequence requirement for ADAQ23875/ ADAQ23876/ ADAQ23878 family of 16/18-bit 15 MSPS µmodule data acquisition solutions?
A: The ADAQ23875/ ADAQ23876/ ADAQ23878 do not have any specific power supply sequencing requirements. The internal ADC core of ADAQ23875/ ADAQ23876/ ADAQ23878 has a power-on-reset (POR) circuit that resets the µModule at initial power-up or whenever VDD drops well below the minimum values.
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Q: Is ADAQ4380-4 Quad, 16-bit, 4 MSPS, Simultaneous Sampling, μModule Data Acquisition Solution based on AD7380-4 16-Bit, SAR ADC?
A: Yes, the ADAQ4380-4 has the AD7380-4 core ADC inside.
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Q: How do we choose between the different filter types for ADAQ7767-1/ ADAQ7768-1/ ADAQ7769-1 24-Bit Data Acquisition Solutions?
A: There are 3 types of digital filters addressing various application needs:
- Wideband Low Ripple (Brickwall) filter would be desired in applications that require a very flat passband response. These are applications such as data acquisition, SONAR, or electronic test and measurement. The 20mdB low ripple FIR filter would ensure flat passband and would help the user to extract all details of the signal.
- Sinc5 filter (max ODR= 1MSPS) would be useful for low latency applications such as control loops or protective relays.
- Sinc3 with 50/60 Hz rejection helps in applications demanding rejection of power line frequency with fast settling at ODR= 50SPS.
A programmable digital filter can also be uploaded by overwriting the filter coefficients of the Wideband Low Ripple filter through a series of register writes.