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G12242-0707W_15 Datasheet, PDF (1/10 Pages) Hamamatsu Corporation – Near infrared area image sensor with 128 x128 pixels
InGaAs area image sensor
G12242-0707W
Near infrared area image sensor with
128 × 128 pixels
The G12242-0707W has a hybrid structure consisting of a CMOS readout circuit (ROIC: readout integrated circuit) and
back-illuminated InGaAs photodiodes. Each pixel is made up of an InGaAs photodiode and a ROIC electrically connected by
indium bumps. The timing generator in the ROIC provides an analog video output and AD-TRIG output which are obtained
by just supplying a master clock (MCLK) and master start pulse (MSP) as digital inputs from external sources.
The G12242-0707W has 128 × 128 pixels arrayed at a 20 μm pitch and their signals are read out from a video line. Light
incident on the InGaAs photodiodes is converted into electrical signals which are then input to the ROIC through indium
pumps. Electrical signals in the ROIC are converted into voltage signals by charge amplifiers and then sequentially output
from the video line by the shift register. The G12242-0707W is hermetically sealed in a TO-8 package together with a two-
stage thermoelectric cooler to deliver low-cost yet highly stable operation.
Features
Spectral response range: 0.95 to 1.7 μm
High sensitivity: 1 μV/e-
Frame rate: 258 fps max.
Global shutter mode and rolling shutter mode switchable
Simple operation (built-in timing generator)
Two-stage TE-cooled
Low cost
Applications
Thermal image monitor
Laser beam profiler
Near infrared image detection
Foreign object detection
Block diagram
The G12242-0707W operates in either global shutter mode or rolling shut-
ter mode which are switchable. The operation of the readout circuit in each Start
mode is described below.
Rolling shutter mode
The sample-and-hold switches in all pixels are always ON. Pixel scanning
starts from the top left point as shown in the figure on the right.
The vertical shift register scans from top to bottom while sequentially se-
lecting each row. The following operations  to ‘ are performed on each
pixel of the selected row.
 Transfers the integrated optical signal information to the signal processing
circuit as a signal voltage, and samples and holds the signal voltage.
 Resets each pixel after having transferred the signal, transfers the reset
signal voltage to the signal processing circuit, and samples and holds the
reset signal voltage.
‘ The horizontal shift register performs a sequential scan to output the
signal voltage and reset signal voltage as serial data. The offset voltage
in each pixel can be eliminated by finding a difference between the signal
voltage and the reset signal voltage with a circuit outside the sensor.
After the above operations  to ‘ are complete, the reset switch for each
pixel on the selected row turns off and signal integration begins. At the
same time, the vertical shift register shifts by one row to select the next
row and the operations  to ‘ are repeated.
After the vertical shift register advances to the 128th row, the master start
pulse (MSP), which is a frame scan signal, changes from low (0 V) to high
(5 V), and the next frame scan begins when the MCLK goes low. The signal
integration time 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.
128 × 128 pixels
End
Signal processing circuit
Horizontal shift register
VIDEO
(signal voltage)
VIDEO
(reset voltage)
KMIRC0068EA
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