MODULE

Photosensor amplifier

Digital output function, current-to-voltage conversion amplifier for amplifying very slight photocurrent with low noise

C9329

C9329 is a current-to-voltage conversion amplifier used to amplify very slight photocurrent from a photodiode with very low noise. Three ranges

of photocurrent detection sensitivity level (H, M, L) are selectable to match the input signal. C9329 operates on the built-in dry batteries so it can

be easily used anywhere. C9329 can be directly connected to a personal computer through the RS-232C interface allowing you to acquire high-

resolution (16-bit) digital output signals and use the data logger function.

Features

Applications

l Precision photometry

l Laser monitors

l Optical power meters

l Low signal current preamplifiers

1

s A bsolu te m axim um ratings (Ta=25

°C)

Param eter

S ym bol

Value

Unit

M a xim um supply voltage

V cc M a x.

+14

V

O perating tem perature *

1

Topr

0 to +50

°C

S torage tem perature *

1

Tstg

-10 to +60

°C

*1: N o condensation

s E lectrica l a nd o ptica l characteristics (Ta=25

°C)

Param eter

S ym bol

C ondition

Min.

Typ.

Max.

Unit

H

-

1 × 10

9

-

M

-

1 × 10

7

-

C onversion

im pedance

L

Rf

-1 × 10

5

-

V/A

H

0

-

±5

M

0

-

±500

Input photo

current range

L

Ic

0

-

±50000

nA

HD C

16

-

M

D C

1.6 k

-

F requency

bandwidth (-3 dB )

L

fc

D C

1.6 k

-

Hz

O ffset drift

-

*2

-

-

±0.5

mV /day

Tem perature drift

-

-

-

25

µ V /

°C

M a xim um output

am plitude

Ω

±5

-

-

V

O utput noise

Vn

F requency bandwidth *

3

-

-

0.5

mV p-p

O utput resistance

Ro

-

100

-

Ω

M a xim um input

capacitance

Ct

O vershoot 30 % M ax.

-

-

5000

pF

A nalog

output

(M A NUA L

MO D E )

Maxim um

capacitive load

-

-

1000

pF

Interface

-

R S -232C , 19200 bps, 8-bit, N on-parity,

2-stop bit

-

A /D conversion

voltage range

-

±5

V

Digital

output

(R E M O TE

MO D E )

A /D read cycle

-

-

50

-

m s

C onsum ption current

Is

*

4

-

-

20

mA

B attery lifetim e

-

-50

-

hr

*2

：W ithout photodiode. Maxim um output variation per day, m easured at 25 °C after 10-m inute warm -up after power ON.

*3

： Analog output m easured after am plified 10 tim es (through 1.6 kHz low-pass filter).

*4

：W ithout photodiode. W hen using one alkaline dry battery 6LR61 (006P, 9 V) in analog output.