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5-DOT DUAL LED LEVEL 

METER DRIVER

 

 

DESCRIPTION

 

The

KA2284

   

is a monolithic integrated circuit

designed for 5-dot LED level meter drivers with a
built-in rectifying amplifier. It is suitable for AC/DC
level meters such as VU meters or signal meters.

FEATURES 

*High gain rectifying amplifier included(Gv=26dB)
*Low radiation noise when LED turns on
*logarithmic indicator for 5-dot LED of bar type.
*Constant current output( 15mA)
*Wide operating supply voltage(3.5V~16V)
*Not necessary diode or transistor for ALC
*Minimum number of external parts required

 

 

SIP-9

 



BLOCK DIAGRAM 

 

1

2

3

4

6

7

8

9

5

comparator

Amplifier

Reference

Voltage

Vcc

Input

Output

D5

GND

D4

D3

D2

D1

comparator

comparator

comparator

comparator



ABSOLUTE MAXIMUM RATINGS

(Ta=25

°

C

)

Characteristic 

 Symbol 

Value 

Unit 

Supply Voltage

Vcc

1

6

V

Amplifier input Voltage

V8

-0.5V~Vcc

V

Pin 7 Voltage

V7

6

V

D terminal Output Voltage

V

D

1

6

V

Operating Temperature

Topr

-20 to +80

°

C

Storage Temperature

Tstg

-40 to 125

°

C

Power dissipation

P

D

1100

W

 

 

 

 

 

 

 

KA2284                                     LINEAR  INTEGRATED  CIRCUIT

 

1  

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ELECTRICAL CHARACTERISTICS

(Ta=25

°

C,Ta=25

°

C,V

CC

=6V,f=1kHZ, unless otherwise specified)



Characteristic



Symbol 

Test Condition



Min 

Typ. 

Max 

Unit 

Supply Voltage

V

CC

3.5

6.0

16.0

V

Supply Current

I

CC

V

IN

=0

5

8

mA

Sensitivity

Vin

In V

C3

Level

46

56

66

mV

Comparator ON Level 1

V

C1

-11.5

-10.0

-8.5

dB

Comparator ON Level 2

V

C2

-6

-5

-4

dB

Comparator ON Level 3

V

C3

0

dB

Comparator ON Level 4

V

C4

2.5

3.0

3.5

dB

Comparator ON Level 5

V

C5

5

6

7

dB

LED Output current

I

LED

11.0

15.0

18.5

mA

Amp Gain

Gv

Vi=0.1V

24

26

28

dB

Input Bias Current

I

INO

-1.0

-0.3

µ

A



TEST CIRCUIT 





1

2

3

4

6

7

8

9

5

Amplifier

Reference

Voltage

R1

10k

Ω¦

C 1

10

µ

F

VR

10k

Ω¦

2.2

µ

F

Vcc

Input

Comparator

Comparator

Comparator

Comparator

Comparator

R















 

KA2284                                     LINEAR  INTEGRATED  CIRCUIT

 

  

  

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APPLICATION INFORMATION 

1. By changing the time constant C1 and ,the response, attack and release time, may be varied. In the above

application conditions, power dissipation may be operated at higher levels than the absolute maximum ratings.

The wattage of R is to be determined by the total LED current and R value recommended by the R table.





TO KA2284 

R

Vcc= 10~16V; R=100

Ω¦

Vcc= 8~14V; R=68

Ω¦

Vcc=6.5~12V; R=47

Ω¦

Vcc





TYPICAL PERFORMANCE CHARACTERISTICS 





-20

0

20

40

60

80

-40

0

1000

1200

600

1400

800

400

200

Ambient Temperature, (



Maximum Power Dissipation vs Ambient

Temperature

Pdmax

(mW)





KA2284                                     LINEAR  INTEGRATED  CIRCUIT

 

 

    

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