Heme Flap Monitor Design

flux

That makes sense.
I agree with locking the first product to ADPD4200 and treating ADPD4101BCBZR7 as a future upscale platform. That matches the basic component-selection rule of choosing to the application need instead of overbuilding the first revision
Why this is a good decision
  • Lower IC cost
    • Best if the first goal is proving clinical signal value, not maximizing optical channel count.
  • Simpler architecture
    • Fewer available channels forces discipline in the sensor head and firmware.
  • Better product segmentation
    • Gen 1: lower-cost monitor on ADPD4200
    • Gen 2 / premium platform: richer multi-wavelength product on ADPD4101BCBZR7
  • Lower integration risk
    • You avoid spending time validating channels you may never need.
The main tradeoff you are accepting
With ADPD4200, you should assume:
  • fewer LED experiments in one build
  • fewer photodiode/reference paths
  • less room for "just in case" optics
So the right move is to be intentional about the initial optical set.
What I would lock for Rev A
Use ADPD4200 with:
My recommendation on the 410 nm channel
  • Put XL-1608UVC-04 on the board only if you’re okay treating it as an experiment
  • Do not make it required for first product success
  • If layout area is tight, make it DNP-capable
That preserves your idea without letting the riskiest wavelength control the whole product.
Clean product split First product
  • ADPD4200
  • 3 to 4 LEDs max
  • 1 photodiode
  • lower BOM cost
  • focused algorithm
Future platform
  • ADPD4101BCBZR7
  • more wavelengths
  • more detector geometry options
  • higher-end analytics or different medical use cases
That is a very rational roadmap.
What I’d do next
I’d define the exact 4 optical channels now, because that is the key constraint imposed by ADPD4200.
My suggested priority order:
  1. LS Q976-NR-1-0-20-R18
  2. MTSM0074-843-IR
  3. APTD1608F3C
  4. XL-1608UVC-04 as optional
If you want, I can do the next step and give you a ranked final optical stack for the ADPD4200:
  • strict low-risk production set
  • aggressive experimental set
  • and the exact channel assignment for each LED and photodiode path.
Rank final stack
Low-risk production set
Aggressive experimental set
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R1
Resistance
500 Ω
L1
Inductance
Inductance
C1
Capacitance
Capacitance
LED1
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PCBWay 4 Layer Stackup

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