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AN521 Datasheet(PDF) 5 Page - Silicon Laboratories

Part # AN521
Description  IRLED SELECTION GUIDE
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

AN521 Datasheet(HTML) 5 Page - Silicon Laboratories

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AN521
Rev. 0.1
5
In general, for most hand-held applications, 8 uW/cm2 is a good minimum irradiance target to use for choosing an
irLED. This allows operation under typical indoor lighting conditions and allows operation outdoors. For the rest of
this document, 8 uW/cm2 is assumed in all calculations. Choosing a higher Ee value at the sensor would lead to an
irLED with a higher radiant intensity, leading to trade-offs on radiation pattern or irLED cost.
16 uW/cm2
Yes
Large
25.6
s
Artificial Lighting CFL < 4 klx; Incandescent < 1.8 klx
32 uW/cm2
Yes
Large
25.6
s
Artificial Lighting CFL < 8 klx; Incandescent < 3.6 klx
58 uW/cm2
Yes
Large
25.6
s
Artificial Lighting CFL < 14.5 klx; Incandescent < 6.5 klx
7 uW/cm2
Yes
Large
25.6
s
Indirect Sunlight < 16 klx
22 uW/cm2
Yes
Small
51.2
s
Direct Sunlight < 80 klx
45 uW/cm2
Yes
Small
25.6
s
Direct Sunlight < 190klx
Table 1. Typical Ee Design Targets (Continued)
Ee (sensor)
Minimum
HSIG Bit
IR Photo
Diode
ADC
Integration
Time
Usage (no overlay assumed)


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