Tool/software:
In our custom board design, we are targeting an ADC that can support an input current of approximately 20 µA per channel with a total of 256 channels, interfacing with the Agilex 5 SoC.
Previously, we were using the ADAS1135 ADC, which provides only 755 nA per channel, and this is insufficient to meet our current signal requirements.
We request your recommendation for a suitable alternate ADC that satisfies the following specifications:
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Input current per channel: ~20 µA
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Total channels: 256 (or the closest feasible configuration)
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Compatible with Agilex 5 SoC interface requirements (LVDS, SPI, or parallel as applicable)
If a single 256-channel ADC is not available, please advise on a feasible implementation using multiple lower-channel-count ADCs (for example, two 128-channel ADCs), including:
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Daisy-chaining or parallel connection strategies to the Agilex 5 SoC
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SPI/LVDS interface allocation for multiple ADC devices
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Synchronization approach to ensure simultaneous sampling across all channels
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Reference design or connection schematics illustrating channel routing and power considerations
Providing detailed connection diagrams or reference implementation guidelines for the lower-channel-count ADC approach would be highly appreciated to expedite our board design and integration.
