Samsung KA9270D, KA9270 Datasheet

KA9270 AUDIO FILTER

INTRODUCTION

The KA9270 is a monolithic integrated circuit designed for audio
filter. It is used in compact disc player, digital audio tape recorder,
etc.

FEATURES

• Functions:

• Gain adjustable of audio output

• Minimum number of external parts required

• Recommand operation supply voltage range : 5.0 ~ 12.0V

* Buffer for impedence matching
* Low pass filter
* De - emphasis control
* Mute control
* Reference voltage circuit ( 1/2 VCC AMP )

BLOCK DIAGRAM

LPF
OUTPUT2 LPF2B V

20 19 18 17 16 15 14 13 12 11

LPF2

-

+

REF

RIPPLE

-

+

1/2Vcc-AMP

20-DIP-300A

20-SOP-375

Device Package Operating Temperature

KA9270 20-DlP-300A

KA9270D 20-SOP- 375

DE-EMPHA

DE-EMPHA

CTL

OUT2

Vcc

DE-AMP2

DE-EMPHA

IN3

-

+

20°C ~ +75°C

BUFFER

OUT2 INPUT2

-

+

BUFFER2

BUFFER
OUT1

BUFFER1

+

-

+

-

LPF1

1 2 3 4 5 6 7 8 9 10

GND LPF

OUTPUT1

LPF1B MUTE

MUTE

SW

CONTROL

INPUT

DE-EM

SW

DE-EMPHA

CONTROL

INPUT

DE-EMPHA
CTL

DE-AMP1

DE-EMPHA
OUT1

+

-

DE-EMPHA
IN1

Fig. 1

INPUT1

KA9270 AUDIO FILTER

ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)

Characteristic Symbol Value Unit

Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature

ELECTRICAL CHARACTERISTICS

(Ta = 25°C, VCC = 8V, f = 1KHz, RL = 10KΩ, De-emphasis; off, Mute; off, S1 & S2; off, unless otherwise specified)

Characteristic Symbol Test Conditions Min Typ Max Unit

Quiescent Circuit Current I
Maximum Output Voltage V

Total Harmonic Distortion THD VO = 0dBm f = 10KHz 0.05 0.1 %

Frequency Characteristics fv VO = 6dBm f = 10KHz -0.5 0 0.5 dB

Cross Talk CT VO = 0dBm f = 1KHz 65 75 dB

Signal to Noise Ratio S/N
Channel Balance CB VO = 0dBm -1.0 0 1.0 dB

Open Loop Gain G
Gain Adjusting Range G
Mute Attenuation Ratio ATT

De-emphasis DE

Note: De-emphasis input conditions: VO = 0dBm

CC

OM

VO
VR

MUTEVI

EMPH

De-emphasis off position

V

CC

P

D

T

OPR

T

STG

16

550

-20 ~ + 75

-45 ~ + 150

V

µW

°C
°C

VI = 0 1 4 6 mA
THD = 1% 1.8 2.1 Vrms

f = 100Hz 0.01 0.05
f = 1KHz 0.01 0.05

f = 16KHz 0.1 0.2
f = 20KHz 0.1 0.2
f = 100Hz -0.1 0 0.1
f = 1KHz 0 0 0

f = 16KHz -1.0 0 1.0
f = 20KHz -1.5 0 1.5
f = 100Hz 70 80

f = 10KHz 60 65

VO = 0dBm, RG = 600Ω
20KHz LPF

73 80 dB

VI = 900mVrms -2.6 -0.6 1.0 dB
VI = 900mV, S1, S2; ON 4.5 6 dB

= 900mV, Mute SW; ON 40 50 dB

f = 1KHz -0.87 -0.37 0.13

De-emphasis: ON f = 5KHz -6.03 -4.53 -3.03 dB

f = 16KHz -10.53 -9.03 -7.53

KA9270 AUDIO FILTER

TEST CIRCUIT

CH2
OUTPUT
(Vo)

3.3§Þ

+

10K

Vcc

47§Þ

0.01§Þ

5.6K

330pF

+

0.0015§Þ

5.6K 5.6K

1/2 Vcc

1M

0.0012§Þ

+

4.7§Þ

12K

27K 27K

20 19 18 17 16 15 14 13 12 11

Vcc

LPF2

LPF1

-

+

+

-

-

+

MUTESWDE-EM

SW

DE-AMP2

DE-AMP1

-

+

+

-

1 2 3 4 5 6 7 8 9 10

5.6K

CH1
OUTPUT
(Vo)

+

3.3§Þ

10K

330pF

5.6K

0.0015§Þ

MUTE
CONTROL
SIGNAL
(MUTE)

DE-EMPHASIS
CONTROL
SIGNAL
(DE-EM)

5.6K 27K 27K

0.0012§Þ

12K

1M

+

4.7§Þ

BUFFER2

BUFFER1

+

4.7§Þ

CH2-INPUT
(from SIGNAL
GENERATOR
OUTPUT)

5K

+

VI

-

1/2 Vcc

-

+

+

-

CH1-INPUT
(from SIGNAL
GENERATOR
OUTPUT)

+

5K

VI

-

Fig. 2