KA9270 Samsung, KA9270 Datasheet

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KA9270

Manufacturer Part Number
KA9270
Description
Audio filter for used in compact disc player, digital audio tape recorder, etc.
Manufacturer
Samsung
Datasheet

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KA9270
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KA9270
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
BLOCK DIAGRAM
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 V
GND
20
1
OUTPUT1
LPF
OUTPUT2
LPF
19
2
LPF2
LPF1
-
+
+
-
LPF1B
LPF2B
18
3
CC
AMP )
CONTROL
V
MUTE
INPUT
MUTE
REF
SW
17
4
1/2Vcc-AMP
Fig. 1
-
+
RIPPLE
DE-EMPHA
CONTROL
16
DE-EM
INPUT
SW
5
Vcc
KA9270D
DE-EMPHA
KA9270
Device
DE-EMPHA
CTL
CTL
15
6
DE-EMPHA
DE-EMPHA
OUT1
OUT2
14
7
20-SOP- 375
20-DlP-300A
DE-AMP2
DE-AMP1
Package
20-DIP-300A
20-SOP-375
DE-EMPHA
-
+
+
-
DE-EMPHA
IN1
IN3
13
8
AUDIO FILTER
BUFFER
BUFFER
OUT1
Operating Temperature
OUT2
12
9
BUFFER2
BUFFER1
20 C ~ +75 C
-
+
+
-
INPUT2
INPUT1
11
10

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KA9270 Summary of contents

Page 1

... KA9270 INTRODUCTION The KA9270 is a monolithic integrated circuit designed for audio filter used in compact disc player, digital audio tape recorder, etc. FEATURES Functions: * Buffer for impedence matching * Low pass filter * De - emphasis control * Mute control * Reference voltage circuit ( 1/2 V Gain adjustable of audio output Minimum number of external parts required Recommand operation supply voltage range : 5 ...

Page 2

... KA9270 ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature ELECTRICAL CHARACTERISTICS ( 8V 1KHz 10K , De-emphasis; off, Mute; off, S1 & S2; off, unless otherwise specified Characteristic Symbol Quiescent Circuit Current I CC Maximum Output Voltage V OM Total Harmonic Distortion THD Frequency Characteristics ...

Page 3

... KA9270 TEST CIRCUIT CH2 3.3§Þ OUTPUT (Vo) 10K 0.0015§Þ 47§Þ 5.6K 0.01§Þ Vcc 330pF + 5.6K 5. LPF2 - + + - LPF1 5.6K 330pF 5.6K + CH1 3.3§Þ OUTPUT (Vo) 0.0015§Þ 10K 1/2 Vcc 1M 0.0012§Þ 12K + 4.7§ ...

Page 4

... KA9270 APPLICATION INFORMATION 1. BUFFER INPUT + (from D/A Converter - Output used for impedance matching, between D/A converter output and de-emphasis input. 2. DE-EMPHASIS a) De-emphasis operation condition Control Input High Low b) De-emphasis characteristic at the de-emphasis Fig. 4 Equevalent Circuit of De-emphasis ON Mode The de-emphasis charcteristics is dependent on the external parts value. ...

Page 5

... KA9270 3. MUTE R6 Vi Fig. 5 Equivalent Circuit of Mute Switch ON Mode Mute attenuation [M (att)] ratio is as follow (att log QON = 20 log (dB LOW PASS FILTER R3 Vi Cut off frequency ( QON - Fig. 6 Equivalent Circuit of LPF ) is as follow: C (Hz AUDIO FILTER Where internal TR QON ON resistance ...

Page 6

... KA9270 APPLICATION CIRCUIT 3.3 §Þ CH2 OUTPUT R L 10K Vcc C10 330p 20 19 LPF2 - + + - LPF1 330p + CH1 C5 OUTPUT 3.3 ¥ì (Vo 10K 1/2 Vcc C9 1M R12 5.6K 120uP 1500p 4.7 ¥ì 5.6K 5.6K R11 R10 10 ¥ì Vcc - + MUTE ...

Page 7

... KA9270 (PCB PATTERN) AUDIO FILTER ...

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