GL3276A

3

Pin Description

NO.

SYMBOL

PIN FUNCTION

1

Power input

3

Power output

5

GND

Ground

• Apply a voltage of 5V ¡ ¾10 % to pin 1.

As the power is output to pin 3 through the internal

power filter resistance, connect an electrolytic

capacitor to pin 3.

8

IN +

Input

• With an internal impedance of 110 K§ Ù(typ.) pin 8

can accept a PIN photodiode directly. An automatic

bias level control (ABLC) circuit prevents the input

from being saturated by external light,

assuring bias level stability for the input pin.

7

IN -

Initial amplifier

Gain setup

• Initial amplifier differential inverted output. Its gain

can be set up with an external impedance.

4

BPF

frequency

setup

• The central frequency of the band-pass filter can be

varied with an external resistance. A built-in trap

circuit prevents malfunctions associated with a high-

frequency lighting fluorescent lamp.

6

Detection

capacitor

• Pin to which a detection capacitor is connected.

2

OUT

Output

• Open collector output with pull-up resistance.

Its capability to drive a CMOS or TTL makes for easy

connection with a receiving microcomputer.

The GL3276A has an active low output.

Sample Application Circuits

8 Pin Plastic

SOP

Photo diode

IN +

IN -

GND

GL3276A

OUT

1

2

3

4

8

7

6

5

Power

supply

Output

47

µF

130 k§ Ù

)

1500pF

0.01

µF

C1

R1

0 to 1k