HAMAMATSU C7563, C4758, C4757, C4674 Datasheet

PSD

Signal processing circuit for 2-D PSD

C4674, C4757, C4758, C7563

Signal processing circuit designed to facilitate operation of 2-D Position Sensitive Detector

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

■ 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 -

DC signal processing circuit

●

Suitable for DC light displacement measurement.

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.

■■■■ Combination with Hamamatsu 2-D PSD

Each signal processing circuit can be used with the following Hamamatsu 2-D PSD.

PSD

Signal
processing circuit

C4674 O O
C4757 O
C4758 O

C7563 O O
*1: Connected externally
*2: Using attachment board

S1880 S1881 S2044 S5990-01 S5991-01 S1300 S1200

Pin-cushion type

*1

*1

OO *2O

O O

*2

O

*2

*2

Duo-lateral

type

Tetra-lateral

type

■■■■ 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.

Type No.

C4674 HDEB-9S (made by Hirose Electric) for mounting S5990-01, S5991-01

C4757 -

C4758 -

C7563

HDAB-15S (made by Hirose Electric)

Supplied connector Attachment board

Accessory

for mounting S5990-01, S5991-01

1

Signal processing circuit for 2-D PSD

■ Absolute maximum ratings

Parameter Symbol

Supply voltage Vcc Max. ±18 V

Signal
processor

LED driver

Input current IIN Max. Vcc Max. × 10
Output short-circuit time - Continuous s
Operating temperature Topr 0 to +50
Transistor collector-emitter voltage V
Transistor collector current *
Transistor collector dissipation *

C4674, C4757, C4758, C7563

DC circuit

C4674 C4757 C4758 C7563

3

3

CE

C

I

Pc - - - 900 mW

-- -+50V

- - - 2 A

AC circuit

-5

Unit

A

°

C

■ Specifications (Ta=25

°

C, Vcc=

15 V)

±

Typical value

AC circuit

Unit

V/A

-4

A

4

Symbol

Rf

Parameter

Head-amp conversion impedance *
Feedback capacitance Cf

Input signal current *

5

I

Condition

Factory setup prior to shipping
Factory setup prior to shipping
Photocurrent with PSD

IN

installed

DC circuit

C4674 C4757 C4758 C7563

1 × 10

5

100 22 pF

-5

1 × 10

to 1 × 10

Output response time
versus movement of light
spot position, measured
with PSD installed.

7

OS

*
With PSD installed and

Vo

light spot falling on edge
of active area.
All range *

Vn

7

3

Ic *

8

30 µs

-10 to +10 mV

-10 to +10 V

7

5 10 mVp-p

±15 ±60 mA

- - - 680 mAp-p

- - - 333 HzLED
Open

collector

-

Signal
processor

driver

Rise time tr

PSD reverse bias voltage VR-+5V
Output offset voltage V

Output voltage amplitude *

6

Output noise (analog divider)
Current consumption Icc *
Transistor collector current
Repetition frequency fT*

Output type - - - - -

*3: Duty ratio: 3/100, pulse width: 90 µs, 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 × 106 Ω. 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 µA (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 µs is supplied.

*8: Repetition frequency 333 Hz (duty ratio: 3/100, pulse width: 90 µs) cannot be modulated.

■ Operating example (C4674)

2-D

PSD

Y
X2
VR
Y1
X1

2

SIGNAL

PROCESSING CIRCUIT

C4674

3
5
4
1
2

+V

GND

-V

Xout

GND

Yout

+15 V

0 V

-15 V

REGULATED

POWER

SUPPLY *

+

VOLTMETER

-

+

GND

Constant voltage power supply: ±15 V, Power capacity: 0.1 A Min.
Ripple voltage: 3 mVp-p Max.

-

VOLTMETER

KPSDC0034ED

Condition

1. Light source LED (λ=900 nm)

2. Light spot diameter φ200 µm

The followings are obtained with the conditions listed
on the left.

3. PSD used S1880 (12 × 12 mm)

4. PSD photocurrent 10 µA

5. Signal processing circuit C4674

6. Frequency bandwidth 10 Hz

7. Voltmeter KEITHLEY model 195 A

Output voltage amplitude V

Position resolution ∆x=0.1 µm approx.
(calculated values) ∆y=0.1 µm approx.

FS (X)=±6 V
FS (Y)=±6 V

V

2