Heme Flap Monitor Design
0:30
Considering component selection.
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.
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:
- one main photodiode, likely SFH 2440
- three core LEDs:
- LS Q976-NR-1-0-20-R18 for red
- MTSM0074-843-IR for 740 nm
- APTD1608F3C for IR
- one optional experimental slot:
- XL-1608UVC-04 for 410 nm
- 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
- 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:
- LS Q976-NR-1-0-20-R18
- MTSM0074-843-IR
- APTD1608F3C
- 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
16 days
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