G12242-0707W_15 Datasheet, PDF (6/10 Pages) Hamamatsu Corporation – Near infrared area image sensor with 128 x128 pixels

InGaAs area image sensor
G12242-0707W
Timing chart
The video output from a single pixel is equal to 4 MCLK (master clock) pulses. The MSP (master start pulse) is a signal for setting the
integration time, so making the low (0 V) period of the MSP longer will extend the integration time. The MSP also functions as a signal
that triggers each control signal to perform frame scan. When the MSP goes from low (0 V) to high (5 V) , each control signal starts on
the falling edge of the MCLK and frame scan is performed during the high period of the MSP. In the global shutter mode, the low (0 V)
period of the MSP serves as the integration time. In the rolling shutter mode, the integration time for the n-th row is the time period
from right after the end of the n-th row scan to the timing for holding the optical signal information integrated on the n-th row in the
next frame. The timing charts when operated at a MCLK frequency of 20 MHz are shown below.
tpw(MCLK)
tf(MCLK)
tr(MCLK)
t2
t1
tf(MSP)
tr(MSP)
t3
tpw(MSP)
Integration time
during global shutter mode
One frame scanning period [(128 rows × 128 columns × 0.2 μs) (including blank)]
MCLK
(input)
MSP
(input)
AD_TRIG
(output)
VIDEO_S
(output)
VIDEO_R
(output)
MSP Low
űŦųŪŰť*¹ 4.6 μs 0.2 μs 0.2 μs 4.6 μs 0.2 μs 0.2 μs 4.6 μs 0.2 μs 0.2 μs
(Blank period)*² (1-1 ch) (1-128 ch) (Blank (2-1 ch) (2-128 ch) (Blank (3-1 ch) (3-128 ch)
period)
period)
0.2 μs
MSP Low
0.3 μs*³ űŦųŪŰť*¹ 4.6 μs 0.2 μs 0.2 μs 4.6 μs
(128-128 ch) (Blank period)
(Blank period) (1-1 ch) (1-128 ch) (Blank period)
A Integration time for the first row during rolling shutter mode*⁴ B
3.839 ms
AD_TRIG
VIDEO_S
Dummy (2 clocks)
VIDEO_R
0.2 μs 0.2 μs
4.6 μs
0.2 μs 0.2 μs
n-127 ch n-128 ch Blank period between rows (n+1)-1 ch
*1: The minimum number of MCLK pulses during the MSP low period is 20. The integration time can be changed by adjusting the MSP
low period.
Rolling shutter mode: Integration time = MSP low period + 3.838 ms
Global shutter mode: Integration time = MSP low period
*2: There is a blank of 4.6 μs between each row.
*3: The blank period after scanning the last channel is 0.3 μs.
*4: The integration time for the first row in the rolling shutter mode is the time period from after 0.15 μs (period “A”) after the first row
is scanned to the timing for holding the optical signal information integrated on the first row in the next frame. (Period “B”: 2.45 μs
from the falling edge of the MCLK pulse right after the MSP goes high)
As with the first row, the integration time for the second row onward is the time period from right after the end of scan on that
row to the timing for holding the optical signal information integrated in the next frame.
From the second row onward, the integration start timing shifts by 30.2 μs right after the end of scan on the preceding row. This
operation is repeated until the 128th row and then returns to the first row.
KMIRC0071EB
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