PI228MC-A4

High Power Yellow-Green LED

Parameter

Symbol

Value

Units

Note

Line scanning rate

90

µsec

@ 5.0

MHz clock

frequency

Fclk

5.0

MHz

Video Output

0.5

Volt

Bright output

Up

<+/-30

%

Ud

<40

mV

Dark Level (DL)

<60

mV

Modulation transfer

MTF

>40

%

Table 5C. PI228MC-A4 Electro-Optical Characteristics

See notes below Table 5D.

PI229MC-A4

Low Power Yellow-Green LED

Parameter

Symbol

Symbol

Units

Notes

Line scanning rate

150

µsec

@ 3.0

MHz clock

frequency

Fclk

3.0

MHz

Video Output

0.5

Volt

Bright output

Up

<+/-30

%

Ud

<40

mV

Dark Level (DL)

<60

mV

Modulation transfer

MTF

>40

%

Table 5D. PI229MC-A4 Electro-Optical Characteristics

Definition:

(1) Tint is the line scanning rate or integration time. Tint is determined by the interval between two

start pulses, SP.

(2) Fclk: main clock frequency also equals the video sampling frequency.

(3) Video output level is controlled with a voltage adjustment as well as the Integration time and

LED light power.

(5) Ud = Vdmax – Vdmin

Vdmin is the minimum output voltage with LED off.

Vdmax is maximum output voltage with LED on.

(6) This level is measured from the reset level that is located between the pixels, during the pixel

reset duration. The reset level is at or near ground, 0V. Note the gain is adjustable on each

output. However, it is recommended that the gain should not be increased above the level

where the reset ground level starts to increase above zero.

(7) A graph of the typical MTF vs DOF is shown under discussion of MTF in Figure 5.

PAGE 6 OF 10 - PI227/228/229, 01-31-04

(4) Up = [Vp(max) - Vpavg]/Vpavgx100% or [Vpavg-Vp(min)]/Vpavg}x100%, whichever is greater

is selected.

Where Vp(max) = maximum pixel level and Vp(min) = minimum pixel level.

and Vpavg =

∑

=

5184

1

5184

/

)

(

n

n

n

Vp