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PDF KA9270 Data sheet ( Hoja de datos )
| Número de pieza | KA9270 | |
| Descripción | AUDIO FILTER INTRODUCTION | |
| Fabricantes | Samsung | |
| Logotipo |  |
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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.
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
VREF
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
56 7 8 9
DE-EMPHA DE-EMPHA DE-EMPHA DE-EMPHA BUFFER
CONTROL CTL
OUT1
IN1
OUT1
INPUT
10
INPUT1
Fig. 1
1 page  
KA9270
3. MUTE
R6
Vi
RQON
-
+
AUDIO FILTER
Where:
RQON = internal TR
ON resistance
Vo
Fig. 5 Equivalent Circuit of Mute Switch ON Mode
Mute attenuation [M (att)] ratio is as follow;
M (att) = 20 log VO
VI
= 20 log RQON (dB)
R6
4. LOW PASS FILTER
R3
Vi
R2
C3
R1
C4
-
+
Fig. 6 Equivalent Circuit of LPF
Cut off frequency (FC) is as follow:
fC =
1
2π√R2 R1 C3 C4
(Hz)
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet KA9270.PDF ] | |
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