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PDF S3903 Data sheet ( Hoja de datos )
| Número de pieza | S3903 | |
| Descripción | (S3902 / S3903) NMOS linear image sensor | |
| Fabricantes | Hamamatsu Corporation | |
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IMAGE SENSOR
NMOS linear image sensor
S3902/S3903 series
Current output, high UV sensitivity, excellent linearity, low power consumption
NMOS linear image sensors are self-scanning photodiode arrays designed specifically as detectors for multichannel spectroscopy. The scanning
circuit is made up of N-channel MOS transistors, operates at low power consumption and is easy to handle. Each photodiode has a large active
area, high UV sensitivity yet very low noise, delivering a high S/N even at low light levels. NMOS linear image sensors also offer excellent output
linearity and wide dynamic range.
The photodiodes of S3902 series have a height of 0.5 mm and are arrayed in a row at a spacing of 50 µm. The photodiodes of S3903 series also
have a height of 0.5 mm but are arrayed at a spacing of 25 µm. The photodiodes are available in 3 different pixel quantities for each series: 128
(S3902-128Q), 256 (S3902-256Q, S3903-256Q), 512 (S3902-512Q, S3903-512Q) and 1024 (S3903-1024Q). Quartz glass is the standard window
material.
Features
Applications
l Wide active area
Pixel pitch: 50 µm (S3902 series)
l Multichannel spectrophotometry
l Image readout system
25 µm (S3903 series)
Pixel height: 0.5 mm
l High UV sensitivity with good stability
l Low dark current and high saturation charge allow a long
integration time and a wide dynamic range at room temperature
l Excellent output linearity and sensitivity spatial uniformity
l Lower power consumption: 1 mW Max.
l Start pulse and clock pulses are CMOS logic compatible
Figure 1 Equivalent circuit
START st
CLOCK 1
CLOCK 2
ACTIVE
PHOTODIODE
DEGITAL SHIFT REGISTER
(MOS SHIFT REGISTER)
SATURATION
CONTROL GATE
SATURATION
CONTROL DRAIN
DUMMY DIODE
END OF SCAN
ACTIVE VIDEO
Vss
DUMMY VIDEO
Figure 2 Active area structure
OXIDATION SILICON
b
a
KMPDC0020EA
N TYPE SILICON
P TYPE SILICON
s Absolute maximum ratings
Parameter
Input pulse (φ1, φ2, φst) voltage
Power consumption *1
Operating temperature *2
Storage temperature
*1: Vφ=5.0 V
*2: No condensation
Symbol
Vφ
P
Topr
Tstg
S3902 SERIES: a=50 µm, b=45 µm
S3903 SERIES: a=25 µm, b=20 µm
Value
15
1
-40 to +65
-40 to +85
KMPDA0107EA
Unit
V
mW
°C
°C
1 page  
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NMOS linear image sensor S3902/S3903 series
s Driver circuit
S3902/S3903 series do not require any DC voltage supply
for operation. However, the Vss, Vsub and all NC terminals
must be grounded. A start pulse φst and 2-phase clock pulses
φ1, φ2 are needed to drive the shift register. These start and
clock pulses are positive going pulses and CMOS logic com-
patible.
The 2-phase clock pulses φ1, φ2 can be either completely
separated or complementary. However, both pulses must not
be “High” at the same time.
A clock pulse space (X1 and X2 in Figure 7) of a “rise time/fall
time - 20” ns or more should be input if the rise and fall times
of φ1, φ2 are longer than 20 ns. The φ1 and φ2 clock pulses
must be held at “High” at least 200 ns. Since the photodiode
signal is obtained at the rise of each φ2 pulse, the clock pulse
frequency will equal the video data rate.
The amplitude of start pulse φst is the same as the φ1 and φ2
pulses. The shift register starts the scanning at the “High”
level of φst, so the start pulse interval determines the length of
signal accumulation time. The φst pulse must be held “High”
at least 200 ns and overlap with φ2 at least for 200 ns. To
operate the shift register correctly, φ2 must change from the
“High” level to the “Low” level only once during “High” level of
φst. The timing chart for each pulse is shown in Figure 7.
s End of scan
The end of scan (EOS) signal appears in synchronization
with the φ2 timing right after the last photodiode is addressed,
and the EOS terminal should be pulled up at 5 V using a 10
kΩ resistor.
Figure 7 Timing chart for driver circuit
st
V s (H)
V s (L)
1
V 1 (H)
V 1 (L)
2
V 2 (H)
V 2 (L)
ACTIVE VIDEO OUTPUT
END OF SCAN
tpw s
tpw 1
tpw 2
tvd
tr s tf s
st tr 1 tf 1
1
X1 X2
2
t ov
tr 2
tf 2
s Signal readout circuit
There are two methods for reading out the signal from an NMOS
linear image sensor. One is a current detection method using
the load resistance and the other is a current integration method
using a charge amplifier. In either readout method, a positive
bias must be applied to the video line because photodiode
anodes of NMOS linear image sensors are set at 0 V (Vss).
Figure 8 shows a typical video bias voltage margin. As the clock
pulse amplitude is higher, the video bias voltage can be set
larger so the saturation charge can be increased. The rise and
fall times of the video output waveform can be shortened if the
video bias voltage is reduced while the clock pulse amplitude is
still higher. When the amplitude of φ1, φ2 and φst is 5 V, setting
the video bias voltage at 2 V is recommended.
To obtain good linearity, using the current integration method is
advised. In this method, the integration capacitance is reset to
the reference voltage level immediately before each photodiode
is addressed and the signal charge is then stored as an integra-
tion capacitive charge when the address switch turns on. Fig-
ures 9 and 10 show a typical current integration circuit and its
pulse timing chart. To ensure stable output, the rise of a reset
pulse must be delayed at least 50 ns from the fall of φ2.
Figure 8 Video bias voltage margin
10
8
6
RECOMMENDED BIAS
MAX.
4
VIDEO BIAS RANGE
2
MIN.
0
4 5 6 7 8 9 10
KMPDC0022EA
CLOCK PULSE AMPLITUDE (V)
KMPDB0043EA
Hamamatsu provides the following driver circuits and related
products (sold separately).
Product
name
Type No.
C7883
C7883G
Driver
circuit
C7884
C7884G
C7884-01
C7884G-01
Pulse
generator
C8225-01
Cable A8226
Content
High-speed
driver circuit
C7883
+ C8225-01
Precision
driver circuit
C7884
+ C8225-01
High precision
driver circuit
C7884-01
+ C8225-01
C7883,
C7884 series
C7883 to
C7885 series
Feature
High-speed operation
Single power supply
(+15 V) operation
Compact
Low noise
Good output linearity
Boxcar waveform output
Ultra-low noise
Good output linearity
Boxcar waveform output
BNC, length 1 m
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet S3903.PDF ] | |
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