16 × 16 element photodiode array detector

C4675 series

s Operating principle

When light enters a photodiode, photoelectric conversion

occurs in the photodiode and the photocurrent Ip is gener-

ated. The photocurrent Ip then flows through the current-to-

voltage conversion amplifier feedback resistance Rf and is

output as voltage V (=Ip × Rf).

C4675 series uses current-to-voltage conversion amplifiers

connected to each of the 256-element photodiodes to per-

form parallel signal processing. A low noise bias circuit is

also used to reduce the photodiode junction capacitance.

Type No.

Feedback resistance Feedback capacitance

C4675-102

100 MΩ

C4675-302

50 MΩ

C4675-103

10 MΩ

1 pF

KACCC0001EA

s Block diagram

LOW NOISE BIAS CIRCUIT

+15 V

GND

-15 V

CH

1

CH

2

INCIDENT LIGHT

Ip

Rf

Cf (1p)

-15 V

GND

+15 V

CH256

Rf

Ip

Cf (1p)

Rf

Ip

Cf (1p)

-

+

-

+

-

+

s Application example

FIBER

SPECTRUM

RECEPTACLE

DATA PROCESSING DEVICE

MEMORY

SH

MUX

ADC

GAIN AMP

AC

GAIN AMP

CHOPPER

l Nerve potential measurement under microscope

l 2-D spectrophotometry in visible range

l Fine-modulation light measurement

LOCK IN AMP

C4675-xxx

C4675-xxx

HAMAMATSU

C4675-xxx

C4675-xxx

HAMAMATSU

C4675-xxx

C4675-xxx

HAMAMATSU

KACCC0003EA