C7221, C7251 and C7369 are high sensitivity multichannel detector heads for use with InGaAs linear image sensors. C7251 is designed for the
non-cooled InGaAs linear image sensors (G7230 series), while C7221 and C7369 for the thermoelectrically cooled InGaAs linear image sensors
(G7231/G7233 series) for detection at even lower light levels. All the devices incorporate a low-noise driver/amplifier circuit that provide reliable
operation from simple external signals. C7221 and C7369 also include highly stable temperature controllers that cool the sensor to a preset
temperature level (Ts= -10 C) as soon as the power is turned on. If the cooler fails and causes internal circuitry to overheat, the built-in protection
circuit automatically turns off the power to the thermoelectric cooler.
Despite its compact size, the housing configuration is designed for good heat dissipation, and threaded mounting holes on the front panel allow
connections to other devices such as monochrometers.
The table below shows InGaAs linear image sensors for C7221, C7251 and C7369. They do not come with a InGaAs linear image sensor, so
select the desired sensor and order it separately.
Features
l Designed for InGaAs linear image sensor
C7221, C7369: TE-cooled type
C7251: non-cooled type
l Built-in driver/amplifier and temperature circuits
l Highly stable temperature controller (C7221, C7369)
Cooling temperature (Ta=10 to 30 C):
fixed at -10 0.1 C (C7221), -25 0.1 C (C7369)
l Simple signal input operation
l Compact configuration
Applications
l Near infrared multichannel spectroscopy
l Radiation thermometry
l Non-destructive inspection
l Optical fiber transmittance measurement
I M A G E S E N S O R
InGaAs multichannel detector head
Designed for InGaAs linear image sensor
C7221, C7251, C7369
s
Selection guide
InGaAs linear image sensor
Type No.
Type No.
Number of pixels
Pixel size
[m (H) m (V)]
Active area
[mm (H) mm (V)]
G7231-128
128
6.4 0.2
C7221
G7231-256
256
12.8 0.2
G7230-128
128
6.4 0.2
C7251
G7230-256
256
12.8 0.2
G7233-128
128
6.4 0.2
C7369
G7233-256
256
50 200
12.8 0.2
InGaAs multichannel detector head
C7221, C7251, C7369
s
Absolute maximum ratings
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage (for digital circuitry)
+V
D1/2
*
1
-0.5
-
+7
Supply voltage (for analog circuitry)
V
A
-
-
18
+Vp
-
-
+7
Supply voltage *
2
+V
F
-
-
+14
Digital input voltage
-
-
-
V
D1/2
*
1
V
C7221, C7369
+10
-
+30
Operating temperature
C7251
Topr
0
-
+50
C7221, C7369
0
-
+50
Storage temperature
C7251
Tstg
0
-
+50
C
s
Electrical characteristics
(Ta=25 C, V
D1
=+5 V, V
A
=15 V , V
D2
=+5 V (C7221, C7251)/+6 V (C7369),
Vp=+5 V (C7221, C7251)/+6 V (C7369), V
F
=+12 V, unless otherwise noted)
Parameter
Symbol
Min.
Typ.
Max.
Unit
High level
V
IH
+2.0
-
+V
D1/2
*
1
V
Digital input
Low level
V
IL
-0.5
-
+0.8
V
CLK frequency
f
CLK
-
-
2
MHz
Data video readout frequency
fv
-
-
f
CLK
/4
Hz
Start pulse width
tst
1/f
CLK
-
-
s
High level (Io= -6 mA)
V
IH
+2.0
-
-
V
Digital output
Low level (Io=+6 mA)
V
IL
-
-
+0.8
V
Power supply conditions
Digital circuitry
+V
D
+4.75
+5.0
+5.25
V
Analog circuitry
V
A
14.5
15.0
15.5
V
C7221, C7251
+4.75
+5.0
+5.25
V
C7369
+V
D2
+5.75
+6.0
+6.25
V
C7221, C7251
+4.75
+5.0
+5.25
V
C7369
+Vp
+5.75
+6.0
+6.25
V
Voltage
Other *
2
+V
F
+11.75
+12.0
+12.75
V
+V
D1
(+5 VDC)
-
-
-
+100
mA
+V
A
(+15 VDC)
-
-
-
+100
mA
-V
A
(-15 VDC)
-
-
-
-100
mA
+V
D2
*
2
C7221: +5 VDC
C7369: +6 VDC
-
-
-
+20
mA
C7221: +5 VDC
-
-
+1.5
+1.7
A
+Vp *
2
C7369: +6 VDC
-
-
+2.0
+3.0
A
Current
+V
F
(+12 VDC) *
2
-
-
+100
-
mA
s
Electrical and optical characteristics
(Ta=25 C, Ts= -10 C (C7221)/-25 C (C7369), V
D1
=+5 V, V
A
=15 V,
V
D2
=+5 V (C7221, C7251)/+6 V (C7369), Vp=+5 V (C7221, C7251)/+6 V (C7369), V
F
=+12 V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
C7221, C7251
-
0.9 to 1.7
-
m
Spectral response range
C7369
-
1.2 to 2.6
-
m
C7221, C7251
-
1.55
-
m
Peak sensitivity wavelength
C7369
p
-
2.3
-
m
Saturation output charge
Qsat
-
10
-
pC
Conversion gain *
3
G
-
1
-
V/pC
C7221, C7251
-
0.1
4
pA/pixel
Dark current
C7369
I
D
-
3,000
12,000
pA/pixel
C7221, C7251
-
-
5
%
Photo response non-uniformity *
4
C7369
PRNU
-
-
10
%
*1: C7251 (+V
D1
only)
*2: C7221, C7369
*3: Including the circuit gain.
*4: Measured at 50 % of the saturated output charge. Except for the start pixel and the last pixel.
InGaAs multichannel detector head
C7221, C7251, C7369
s
Specifications for temperature controller (only for C7221, C7369)
(Ta=25 C, V
D1
=+5 V, V
A
=15 V, V
D2
=+5 V (C7221)/+6 V (C7369), Vp=+5 V (C7221)/+6 V (C7369), V
F
=+12 V)
Parameter *
5
Symbol
Min.
Typ.
Max.
Unit
C7221
-11
-10
-9
C
Cooling temperature
C7369
Ts
-26
-25
-24
C
Temperature control range
Ts
-0.1
-
+0.1
C
C7221
-
-
4
W
Power dissipation
of Peltier element
C7369
Pp
-
-
13
W
Cool down time to preset temperature
to
-
-
5
min.
Setting temperature for overheat protection
To
-
+45
-
C
*5: Other functions include error display, automatic power off, and detection of electrical opens and shorts by the
thermosensor.
s
Spectral response (G7230/G7231/G7233 series)
s
Equivalent circuit (G7230/G7231/G7233 series)
-
+
1 PIXEL
PHOTODIODE
SUBSTRATE
BIAS VOLTAGE
IGA-bias
AMPLIFIER
RESET
VOLTAGE Vref
LIGHT SIGNAL
HOLD PULSE
LIGHT SIGNAL OUTPUT
LOAD RESISTANCE R
L
RESET OUTPUT
LOAD RESISTANCE R
L
SUPPLY VOLTAGE Vdd
ADDRESS PULSE FROM
SHIFT REGISTER
RESET
OUTPUT
HOLD
PULSE
CHARGE AMPLIFIER
RESET PULSE
s
Temperature characteristic for dark current
KMIRB0005EA
KMIRB0006EA
0
0.8
1.2
1.6
2
2.4
2.8
0.2
0.4
0.6
0.8
1
1.2
(Typ. Ta=25 C)
WAVELENGTH (
mm)
PHO
T
O
SENSITIVITY (A/W)
G7233 SERIES
G7230/G7231 SERIES
-40
-20
0
20
40
TEMPERATURE (C)
0.001
0.01
0.1
1
10
DARK CURRENT (pA)
(Typ. )
KMIRC0009EA
InGaAs multichannel detector head
C7221, C7251, C7369
LED
TH. H
P+
P-
TH1
TIMING
GENERATOR
D. GND
+V
A
(+15 V)
A. GND
CLK
Start
Trigger
EOS
THERMOELECTRIC
COOLER
*2
InGaAs IMAGE SENSOR
BUFFER
Data Video
DIFFERENTIAL
AMPLIFIER
REGULATOR
Vref
IGA-bias
A-Vdd
SP, 1, 2
SH1, SH2
RES
EOS-e, EOS-o
Video2-o
TH2
+Vp
*1
P. GND
+V
D2
*1
D. GND
+V
F
(+12 V)
F. GND
Temp Monitor
A-Vss
+5 V
D-Vss
D-Vdd
Video1-o
Video2-e
*1: +5 V (C7221), +6 V (C7369)
*2: C7251 does not include the temperature controller and thermoelectric cooler.
Video1-e
DIFFERENTIAL
AMPLIFIER
-
-
+
+
MULTIPLEXER
Cooling control
+V
D1
(+5 V)
-V
A
(-15 V)
TEMPERATURE CONTROLLER
*2
ch 1
ch 2
Start
CLK
SP
1
SH1
SH2
RES
Video2-o
Video2-e
EOS-o
Trigger
Data Video
2
EOS-e
EOS
ch 1
ch 2
40 CLOCKS
4 N CLOCKS
10 CLOCKS
ch (N-1)
ch N
ch (N-1)
ch N
Start
CLK
SP
1
SH1
SH2
RES
Video2-o
Video2-e
EOS-o
Trigger
Data Video
2
EOS-e
EOS
ch 1
ch 2
ch 1
ch 2
g
(
)
The integration time is determined
by the start and CLK signals and the
pixel rate is determined by the CLK
frequency.
T
I
= T
S
- T
R
= Ts -
Ts : Interval of "Start" pulse
T
R
: Scan time
T
I
: Integration time
N : Number of Pixel
(10 + 4 N + 40)
f
CLK
8 CLK
s Block diagram (C7221, C7369)
s Timing chart
KACCC0080EA
KACCC0081EA
InGaAs multichannel detector head
C7221, C7251, C7369
s Pin assignment of "SIGNAL I/O" connector
15-pin D-sub connector
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
s Pin assignment of "TE CONTROL I/O" connector (C7221, C7369)
9-pin D-sub connector
1
2
3
4
5
6
7
8
9
Pin No.
Terminal name
Description
1
NC
No connection
2
Data video
Analog video output. Positive polarity.
3
+V
A
(+15 V)
Analog power supply
4
-V
A
(-15 V)
Analog power supply
5
+V
D1
(+5 V)
Digital power supply
6
Start
Digital input signal for initializing the circuit.
HCMOS compatible. Positive logic.
The interval of the start pulses determine the integration time of InGaAs image sensor.
7
CLK
Digital input signal to specify the circuit operation. HCMOS compatible.
Operates at the rising edge.
8
EOS
Digital output signal to indicate the end of scan of the InGaAs image sensor.
HCMOS compatible. Negative logic.
9
A. GND
Analog ground
10
A. GND
Analog ground
11
NC
No connection
12
D. GND
Digital ground
13
D. GND
Digital ground
14
D. GND
Digital ground
15
Trigger
Digital output signal for A/D conversion. HCMOS compatible. Positive polarity.
Pin No.
Terminal name
Description
1
+V
D2
*
Power supply for temperature controller
2
Temp monitor
Analog output signal of the temperature of the InGaAs image sensor
3
Cooling control
Digital input signal for starting to cool down. HCMOS compatible.
High level or left open: cooling
Low level: stand-by
4
+Vp *
Power supply for the thermoelectric cooler mounted in the InGaAs image sensor
(Please use AWG 18 wire)
5
+V
F
(+12 V)
Power supply for cooling fan
6
D. GND
Ground
7
D. GND
Ground
8
P. GND
Power supply return for the thermoelectric cooler mounted in the InGaAs image sensor
(Please use AWG 18 wire)
9
F. GND
Ground return for cooling fan
* C7221: +5 V, C7369: +6 V
Available for using same power supply (C7221: +5 V, C7369: +6 V) for "+V
D2
" and "+Vp".
Caution: Do not connect "V
D2
" and "Vp" together on the backside of the 9-pin D-sub connector.
These may be connected (shorted) at the power supply end, not 9-pin D-sub connector.
KACCC0069EA
KACCC0075EA
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