RL1201LGO-711 データシートの表示（PDF） - PerkinElmer Inc
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RL1201LGO-711 Datasheet PDF : 8 Pages
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CMOS Spectroscopy Sensor
Clock & Voltage
Requirements (contd.)
sensor. The integration period should
be controlled by varying the time
between start pulses. For optimum
performance and minimum switching
noise, it is important that the clocks
are exact complements and that their
rise and fall times comply with Table 1.
A recommended circuit for generating
these clocks is shown in Figure 7.
End of Scan
An output pulse useful primarily for
test purposes is provided two clock
cycles after the last photodiode is
sampled by the shift register scanning
circuit. The timing of the EOS output
is shown in Figure 6. The voltage levels
on the EOS output will be determined
by the VDD and VSS voltage levels sup-
plied to the photodiode array. When
VDDis at +5V and VSS is operated at 0 V,
the EOS output will be compatible
with the HCMOS family of logic
devices.
Amplifier Requirements
The recommended amplifier circuit for
use with an L-series sensor is a simple
current amplifier. A current amplifier
holds the video line at a virtual
ground and senses the current pulses
flowing into the video line to recharge
the diodes through their respective
multiplex switches as they are sampled
in sequence. These current pulses,
which each can contain a charge up to
saturation, are converted to a train of
voltage pulses corresponding to the
light intensity on the various diodes.
In this mode of operation, the current
amplifier must provide a positive bias
voltage to the video line since the
photodiode anode (the p-substrate) is
biased to 0 V (VSS). Figure 8 shows a
differential recharge amplifier suitable
for use with L-series sensors.
Line Reset / Antiblooming
Control
Under certain operating conditions, it
may be desirable to control integration
time independent of the line scan time
(time between start pulses). This can
be accomplished by the use of the
antiblooming gate control input. When
the antiblooming gate is held high,
all photodiodes are simultaneously
Table 2. Electro-Optical Characteristics (25°C)
Characteristic
Center-to-center spacing
RL12xx
RL15xx
Sensitivity1, 2
RL12xx
RL15xx
PRNU 2, 3, 4
Saturation exposure (ESAT)1, 2
RL12xx
RL15xx
5
Saturation charge (QSAT)
RL12xx
RL15xx
Dynamic range
(QSAT / Q ) NOISE(RMS)
RL12xx
RL15xx
Average dark current 6
RL12xx
RL15xx
Spectral response peak
Spectral response range
Typ
Max
25
-
50
-
2 x 10-4
4 x 10-4
-
-
5
10
50
-
50
-
10
-
20
-
70,000
100,000
0.20
0.40
650
300-1000
-
-
0.50
1.0
-
250-1050
Notes:
1. Measured at specified video line bias.
2. Average 600-700 nm, includes 8% window loss.
3. Photo response non-uniformity (PRNU) is defined as:
a. +% = (VMAX - VAVG) / VAVG x 100%
b. –% = (VAVG - VMIN) / VAVG x 100% where
i. VMAX is the output of the pixel closest to saturation level.
ii. VMIN is the output of the pixel closest to the dark level.
iii. VAVG is the average of all array pixel outputs.
The first and last pixels are not counted in this measurement.
4. Measured at an exposure level of ESAT/2.
5. Minimum Q SAT for RL15xx is 15 pC; RL12xx is 8 pC.
6. Maximum dark current < 1.5 x average dark current.
Table 3. Absolute Maximum Ratings
Min
Voltage applied to any terminal
with respect to VSS
0
Storage or operating temperature
-78
Max
+10
+85
Units
µm
µm
C/J/cm2
C/J/cm2
±%
nnJJ//ccmm22
pC
pC
-
-
pA
pA
nm
nm
Units
V
°C
reset to the bias voltage on the anti-
blooming drain (typically VDD/2).
Conversely, when the antiblooming
gate is held low, the antiblooming
transistor is off and the photodiodes
can then integrate photocurrent. Thus,
when an active high pulse is applied
to VABG, the integration time for diode
"N" then becomes the time between the
negative-going transition of the anti-
blooming gate to the time in which
diode "N" is read out through the diode
multiplex switch. Under normal
operating conditions, the L-series sensors
do not require antiblooming control due
to excellent antiblooming characteristics.
However, under extremely high ex-
posure conditions, antiblooming control
can be implemented to further enhance
this performance. In this mode of
www.perkinelmer.com/opto
DSP-106.01C - 10/2001W Page 4
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