Features
l No complicated adjustment required
Position measurement can be made simply by mounting
2-D PSD.
l Output voltage directly representing the position data
The position (mm) of a light spot from the PSD center is
obtained as an output voltage (V).
l Accurate position detection
Accurate position data can be obtained, independent of
light intensity.
l Compact on-board configuration
A head amplifiers, signal addition/subtraction circuits, and
analog divider are mounted on a compact PC board.
Applications
l Displacement measurements using 2-D PSD
l Various studies using 2-D PSD
l Evaluation of 2-D PSD
P S D
Signal processing circuit for 2-D PSD
Signal processing circuit designed to facilitate operation of 2-D Position Sensitive Detector
C4674, C4757, C4758, C7563
s Four models are available to meet various 2-D PSD types
PSD type
DC signal processing circuit
AC signal processing circuit
Pin-cushion type PSD
C4674
C7563
Duo-lateral type PSD
C4757
-
Tetra-lateral type PSD
C4758
-
q DC signal processing circuit
Suitable for DC light displacement measurement.
q AC signal processing circuit
Designed specifically for pulse (AC) signal detection.
Has a synchronous circuit, S/H (sample & hold) circuit and LED driver circuit.
Use of a pulse-driven LED ensures reliable operation even under background light.
s
s
s
s Combination with Hamamatsu 2-D PSD
Each signal processing circuit can be used with the following Hamamatsu 2-D PSD.
Pin-cushion type
Duo-lateral
type
Tetra-lateral
type
S1880
S1881
S2044
S5990-01
S5991-01
S1300
S1200
C4674
O
O
*1
O
O
*2
O
*2
C4757
O
C4758
O
C7563
O
O
*1
O
O
*2
O
*2
*1: Connected externally
*2: Using attachment board
s
s
s
s Accessories
The mating connectors to a power supply/signal readout device and the boards for mounting surface-mounting ceramic
package PSD are supplied with each signal processing circuit.
Accessory
Type No.
Supplied connector
Attachment board
C4674
HDEB-9S (made by Hirose Electric)
for mounting S5990-01, S5991-01
C4757
-
C4758
-
C7563
HDAB-15 S (made by Hirose Electric)
for mounting S5990-01, S5991-01
PSD
Signal
processing circuit
1
Signal processing circuit for 2-D PSD
C4674, C4757, C4758, C7563
The followings are obtained with the conditions listed
on the left.
Output voltage amplitude
V
FS
(X)=6 V
V
FS
(Y)=6 V
Position resolution
x=0.1 m approx.
(calculated values)
y=0.1 m approx.
s Absolute maximum ratings
DC circuit
A C circuit
Parameter
Symbol
C4674
C4757
C4758
C7563
Unit
Supply voltage
Vcc Max.
18
V
Input current
I
IN
Max.
Vcc Max. 10
-5
A
Output short-circuit time
-
Continuous
s
Signal
processor
Operating temperature
Topr
0 to +50
C
Transistor collector-emitter voltage
V
CE
-
-
-
+5 0
V
Tr a n sist or c oll ector c urr ent *
3
I
C
-
-
-
2
A
LED driver
Tr a n sist or c oll ector dis si patio n *
3
Pc
-
-
-
900
mW
s Specifications (Ta=25
C, Vcc=
15 V)
Typical value
DC circuit
AC circuit
Parameter
Sy m bol
Condition
C4674
C4757
C4758
C7563
Unit
Head-amp conversion impedance
*
4
Rf
Factory setup prior to shipping
1 10
5
V/A
Feedback capacitance
Cf
Factory setup prior to shipping
100
22
pF
Input signal current
*
5
I
IN
Photocurrent with PSD
installed
1 10
-5
to 1 10
-4
A
Rise time
tr
O ut p ut res p o n s e ti m e
v ers u s m o v e m e nt of lig ht
s p ot p o sitio n, m e a s ur e d
with P S D in stalle d.
30
s
PSD reverse bias voltage
V
R
-
+5
V
Output offset voltage
V
OS
*
7
-10 to +10
mV
O ut p ut v oltag e a m plitu d e *
6
Vo
With PSD installed and
light spot falling on edge
of active area.
-10 to +10
V
O ut p ut n ois e (a n alo g divi der)
Vn
All ran g e *
7
5
10
mVp-p
Signal
processor
Current consumption
Icc
*
7
15
6
0
mA
Tr a n sistor c ollector curre nt
Ic
*
3
-
-
-
680
mAp-p
Repetition frequency
f
T
*
8
-
-
-
333
Hz
LED
driver
Output type
-
-
-
-
-
Open
collector
-
*3: Duty ratio: 3/100, pulse width: 90 s, LED: Hamamatsu L1915-01 (sold separately)
*4: These resistors are lead types and inserted into sockets, so it can be easily to exchange by the user if necessary in a range
between 1 10
4
to 1 10
6
. For more details, see the instruction manual that comes with the product.
*5: The circuit does not operate correctly when input signal level is not appropriate.
*6: Maximum output amplitude can be adjusted in a range of 2 to 10 V according to PSD type to be used.
*7: Measured without PSD and with LED turned off, while using a current source of 20 A (X1=X2=Y1=Y2) substituting for PSD
photocurrent. In the case of C7563, however, pulse current with a duty ratio of 3/100 and a pulse width of 90 s is supplied.
*8: Repetition frequency 333 Hz (duty ratio: 3/100, pulse width: 90 s) cannot be modulated.
Constant voltage power supply: 15 V, Power capacity: 0.1 A Min.
Ripple voltage: 3 mVp-p Max.
SIGNAL
PROCESSING CIRCUIT
C4674
2-D
PSD
REGULATED
POWER
SUPPLY *
VOLTMETER
VOLTMETER
+15 V
0 V
-15 V
+V
GND
-V
Xout
+
GND
-
Yout
+
GND
-
Y
2
X
2
V
R
Y
1
X
1
3
5
4
1
2
s Operating example (C4674)
2
KPSDC0034ED
Condition
1. Light source
LED (
=900 nm)
2. Light spot diameter
200 m
3. PSD used
S1880 (12 12 mm)
4. PSD photocurrent
10 A
5. Signal processing circuit
C4674
6. Frequency bandwidth
10 Hz
7. Voltmeter
KEITHLEY model 195 A
Signal processing circuit for 2-D PSD
C4674, C4757, C4758, C7563
HAMAMATSU PHOTONICS K.K., Solid State Division
1126-1 Ichino-cho, Hamamatsu City, 435-8558 Japan, Telephone: (81) 053-434-3311, Fax: (81) 053-434-5184, http://www.hamamatsu.com
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, Fax: (1) 908-231-1218
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49) 08152-3750, Fax: (49) 08152-2658
France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: 33-(1) 69 53 71 00, Fax: 33-(1) 69 53 71 10
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777
North Europe: Hamamatsu Photonics Norden AB: Smidesvgen 12, SE-171 41 Solna, Sweden, Telephone: (46) 8-509-031-00, Fax: (46) 8-509-031-01
Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions.
Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. 2003 Hamamatsu Photonics K.K.
Cat. No. KPSD1005E06
Apr. 2003 DN
Y
1
X
2
0
+L/2
-L/2
-L/2
+L/2
0
X
1
Y
2
ACTIVE AREA
L
L mm
s 2-D PSD and output voltage
KPSDC0032EB
KPSDC0033EA
OUTPUT VOLTAGE (Xout or Yout)
(V)
+L/2
+L/2
-L/2
-L/2
POSITION OF LIGHT SPOT
(mm)
0
Pin-cushion type
Duo-lateral
type
Tetra-lateral
type
Parameter
S1880
S1881 *
9
S2044
S5990-01
S5991-01
S1300
S1200
Unit
Active area length L
12
22
4.7
4
9
13
13
mm
O utput voltage am plitude V o (X )
6
5.5
2.35
2
4.5
6.5
6.5
V
O utput voltage am plitude V o (Y )
6
5.5
2.35
2
4.5
6.5
6.5
V
*9: The position (mm) of light spot from the center is twice the output voltage (V) for the S1881.
If the incident light spot is not sufficiently focused on the PSD, i.e., the light spot diameter is large, and falls upon near the edge
of the active area, part of the light spot may go outside the active area, thus degrading position accuracy.
The output voltage amplitude values listed above are measured when the light spot diameter is made as small as possible within
the range in which adequate intensity is maintained.
CENTER OF
MOUNTED PSD
D-SUB CONNECTOR
(4
) 3.2
a
c
d
b
20
THROUGH HOLES
FOR EXTERNALLY
CONNECTED PSD
15.5 MAX.
b
2
b
2
Symbol
a
b
c
d
C4674
90
65
84
59
C4757
92
70
84
62
C4758
90
65
83
57
C7563
110
75
102
67
PSD *
* PSD is not mounted on this board.
s Dimensional outline (unit: mm, tolerance: 0.2 mm)
KPSDA0018EC
3
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