ADJD-J823 데이터 시트보기 (PDF) - Avago Technologies
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ADJD-J823 Datasheet PDF : 18 Pages
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Color drift over temperature
Data obtain from 5 units. Color set point is at 9000K and VDDD & VDDA at 2.6V.
System consists of ADJD-J823 and RGB LEDs with color coordinates, Red (x,y) = (0.691, 0.309), Green (x,y) = (0.161, 0.704),
Blue (x,y) = (0.131, 0.073). The R:G:B luminance ratio is 2.6 : 3.9 : 1.0
0.009
0.008
Color drift
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
0
10
20
30
40
50
60
System temperature (˚C)
Note: The starting point is at 25oC and is zero color drift as all measurements are made relative to the starting point at 25oC.
Calculating Sampling Frequency and PWM Output Frequency
The sampling frequency, fSAMP, which is the frequency at which ADJD-J823 samples the tricolor photosensor, is related
to the system clock frequency, fCLK. The output PWM frequency, fPWM, is also related to fCLK.
Calculation example:
fCLK = 26 MHz (nominal)
fSAMP = fCLK
= 108Hz(nominal)
SAMPFREQ x 8
fPWM =
fCLK
= 6.35kHz(nominal)
(PWMFREQ + 1) x 4096
SAMPFREQ = Sampling frequency register setting = concatenation of registers [0x06][0x07]
PWMFREQ = PWM frequency register setting = register [0x05]
The internal oscillator frequency varies from part-to-part but it will not vary as significantly during operation.
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