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KA9270 [SAMSUNG]

AUDIO FILTER INTRODUCTION; 音频过滤器简介
KA9270
型号： KA9270
厂家： SAMSUNG    SAMSUNG
描述：

AUDIO FILTER INTRODUCTION
音频过滤器简介

过滤器 消费电路 商用集成电路 光电二极管 LTE
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KA9270  
AUDIO FILTER  
INTRODUCTION  
20-DIP-300A  
The KA9270 is a monolithic integrated circuit designed for audio  
filter. It is used in compact disc player, digital audio tape recorder,  
etc.  
20-SOP-375  
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  
Device  
KA9270  
KA9270D  
Package  
Operating Temperature  
20-DlP-300A  
20-SOP- 375  
20°C ~ +75°C  
BLOCK DIAGRAM  
LPF  
DE-EMPHA DE-EMPHA DE-EMPHA  
BUFFER  
OUTPUT2  
LPF2B  
18  
VREF  
17  
RIPPLE  
16  
CTL  
OUT2  
IN3  
OUT2  
INPUT2  
11  
20  
19  
15  
14  
13  
12  
Vcc  
LPF2  
DE-AMP2  
-
-
-
+
+
-
+
+
1/2Vcc-AMP  
BUFFER2  
BUFFER1  
MUTE  
SW  
DE-EM  
SW  
+
-
+
-
+
-
DE-AMP1  
LPF1  
1
2
3
4
5
6
7
8
9
10  
GND  
LPF  
OUTPUT1  
LPF1B  
MUTE  
CONTROL  
INPUT  
DE-EMPHA DE-EMPHA DE-EMPHA DE-EMPHA BUFFER  
INPUT1  
CONTROL CTL  
INPUT  
OUT1  
IN1  
OUT1  
Fig. 1  
KA9270  
AUDIO FILTER  
ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)  
Characteristic  
Symbol  
Value  
Unit  
Supply Voltage  
VCC  
PD  
16  
V
mW  
°C  
°C  
Power Dissipation  
550  
Operating Temperature  
Storage Temperature  
TOPR  
TSTG  
-20 ~ + 75  
-45 ~ + 150  
ELECTRICAL CHARACTERISTICS  
(Ta = 25°C, VCC = 8V, f = 1KHz, RL = 10KW, De-emphasis; off, Mute; off, S1 & S2; off, unless otherwise specified)  
Characteristic  
Symbol  
Test Conditions  
Min  
Typ  
Max  
Unit  
Quiescent Circuit Current  
Maximum Output Voltage  
ICC  
VI = 0  
1
4
2.1  
0.01  
0.01  
0.05  
0.1  
0.1  
0
6
mA  
VOM  
THD = 1%  
1.8  
Vrms  
f = 100Hz  
f = 1KHz  
0.05  
0.05  
0.1  
0.2  
0.2  
0.1  
0
Total Harmonic Distortion  
Frequency Characteristics  
THD  
VO = 0dBm  
f = 10KHz  
f = 16KHz  
f = 20KHz  
f = 100Hz  
f = 1KHz  
%
-0.1  
0
0
fv  
VO = 6dBm  
VO = 0dBm  
f = 10KHz  
f = 16KHz  
f = 20KHz  
f = 100Hz  
f = 1KHz  
-0.5  
-1.0  
-1.5  
70  
0
0.5  
1.0  
1.5  
dB  
0
0
80  
75  
65  
Cross Talk  
CT  
65  
dB  
dB  
f = 10KHz  
60  
VO = 0dBm, RG = 600W  
20KHz LPF  
Signal to Noise Ratio  
S/N  
73  
80  
Channel Balance  
CB  
GVO  
VO = 0dBm  
-1.0  
-2.6  
4.5  
0
1.0  
1.0  
dB  
dB  
dB  
dB  
Open Loop Gain  
VI = 900mVrms  
-0.6  
6
Gain Adjusting Range  
Mute Attenuation Ratio  
GVR  
VI = 900mV, S1, S2; ON  
VI = 900mV, Mute SW; ON  
ATTMUTE  
40  
50  
f = 1KHz  
f = 5KHz  
-0.87  
-6.03  
-0.37  
-4.53  
-9.03  
0.13  
-3.03  
-7.53  
De-emphasis  
DEEMPH  
De-emphasis: ON  
dB  
f = 16KHz -10.53  
Note: De-emphasis input conditions: VO = 0dBm  
De-emphasis off position  
KA9270  
AUDIO FILTER  
TEST CIRCUIT  
CH2  
OUTPUT  
(Vo)  
3.3§Þ  
1/2 Vcc  
0.0015§Þ  
10K  
1M  
47§Þ  
0.01§Þ  
5.6K  
0.0012§Þ  
12K  
27K  
Vcc  
CH2-INPUT  
(from SIGNAL  
GENERATOR  
OUTPUT)  
+
330pF  
4.7§Þ  
27K  
5K  
+
5.6K 5.6K  
+
4.7§Þ  
+
-
VI  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
Vcc  
1/2 Vcc  
LPF2  
DE-AMP2  
-
+
-
+
-
+
-
+
BUFFER2  
BUFFER1  
MUTE  
SW  
DE-EM  
SW  
+
-
+
-
+
-
DE-AMP1  
LPF1  
CH1-INPUT  
1
2
3
4
5
6
7
8
9
10  
(from SIGNAL  
GENERATOR  
OUTPUT)  
5.6K  
5.6K  
+
4.7§Þ  
330pF  
5.6K  
27K  
12K  
27K  
+
-
5K  
+
CH1  
OUTPUT  
(Vo)  
VI  
3.3§Þ  
MUTE  
CONTROL CONTROL  
SIGNAL  
(MUTE)  
DE-EMPHASIS  
0.0015§Þ  
0.0012§Þ  
SIGNAL  
(DE-EM)  
10K  
1M  
Fig. 2  
KA9270  
AUDIO FILTER  
APPLICATION INFORMATION  
1. BUFFER  
INPUT  
+
to De-emphasis input  
(from D/A Converter  
Output)  
-
Fig. 3  
It is used for impedance matching, between D/A converter output and de-emphasis input.  
2. DE-EMPHASIS  
a) De-emphasis operation condition  
Control Input  
High  
De-emphasis Operation  
ON  
Low  
OFF  
b) De-emphasis characteristic at the de-emphasis ON  
C1  
R5  
R4  
R6  
-
Vi  
Vo  
+
Fig. 4 Equevalent Circuit of De-emphasis ON Mode  
Av  
R4 / R6  
T1 = C1 (R4 + R5)  
T2 = C1 X R5  
The de-emphasis charcteristics is dependent on the external parts value.  
KA9270  
AUDIO FILTER  
3. MUTE  
RQON  
Where:  
RQON = internal TR  
ON resistance  
R6  
-
Vi  
Vo  
+
Fig. 5 Equivalent Circuit of Mute Switch ON Mode  
Mute attenuation [M (att)] ratio is as follow;  
VO  
VI  
M (att) = 20 log  
= 20 log  
RQON  
R6  
(dB)  
4. LOW PASS FILTER  
R1  
R3  
R2  
Vi  
C4  
-
C3  
+
Fig. 6 Equivalent Circuit of LPF  
Cut off frequency (FC) is as follow:  
1
fC  
=
(Hz)  
2pÖR2 R1 C3 C4  
KA9270  
AUDIO FILTER  
APPLICATION CIRCUIT  
3.3§Þ  
CH2  
OUTPUT  
RL  
10K  
1/2 Vcc  
C9  
1M  
R12  
5.6K  
120uP  
12K R9  
CH2-INPUT  
(from DAC  
OUTPUT)  
Vcc  
1500p  
4.7¥ì  
+
C7  
C10  
C8  
27K  
R8  
27K  
R7  
5.6K  
R11  
5.6K  
R10  
330p  
4.7¥ì  
C8  
+
10¥ì  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
Vcc  
LPF2  
DE-AMP2  
-
+
-
+
-
+
-
+
BUFFER2  
BUFFER1  
MUTE  
SW  
DE-EM  
SW  
+
-
+
-
+
-
DE-AMP1  
LPF1  
1
2
3
4
5
6
7
8
9
10  
5.6K  
R1  
+
C7  
4.7¥ì  
10u  
C4  
5.6K  
27K  
R3  
R4  
R6  
27K  
1500p  
R2  
C3  
330p  
C5  
3.3¥ì  
+
C2  
CH1  
MUTE  
DE-EMPHASIS  
CONTROL CONTROL  
OUTPUT  
(Vo)  
CH1-INPUT  
(from DAC  
OUTPUT)  
12K  
1200p  
1M  
SIGNAL  
(MUTE)  
SIGNAL  
(DE-EM)  
RL  
10K  
Fig. 7  
KA9270  
AUDIO FILTER  
(PCB PATTERN)  

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