KA9270 Datasheet, PDF (1/7 Pages) Samsung semiconductor – AUDIO FILTER INTRODUCTION

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.
AUDIO FILTER
20-DIP-300A
FEATURES
• Functions: * Buffer for impedence matching
* Low pass filter
* De - emphasis control
* Mute control
* Reference voltage circuit ( 1/2 VCC AMP )
• Gain adjustable of audio output
• Minimum number of external parts required
• Recommand operation supply voltage range : 5.0 ~ 12.0V
BLOCK DIAGRAM
20-SOP-375
Device
KA9270
KA9270D
Package
20-DlP-300A
20-SOP- 375
Operating Temperature
20°C ~ +75°C
LPF
OUTPUT2 LPF2B
V_REF
20
19
18
17
RIPPLE
16
DE-EMPHA DE-EMPHA DE-EMPHA
CTL
OUT2
IN3
15
14
13
BUFFER
OUT2
12
Vcc
INPUT2
11
LPF2
-
+
-
+
1/2Vcc-AMP
DE-AMP2
-
+
-
+
BUFFER2
+
-
LPF1
MUTE
SW
DE-EM
SW
+
-
DE-AMP1
BUFFER1
+
-
1
GND
2
LPF
OUTPUT1
3
LPF1B
4
MUTE
CONTROL
INPUT
5
6
7
8
9
DE-EMPHA DE-EMPHA DE-EMPHA DE-EMPHA BUFFER
CONTROL CTL
OUT1
IN1
OUT1
INPUT
10
INPUT1
Fig. 1