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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 Device KA9270 KA9270D
20-SOP-375
Package 20-DlP-300A 20-SOP- 375
Operating Temperature 20C ~ +75C
BLOCK DIAGRAM
LPF OUTPUT2
LPF2B
VREF
RIPPLE
DE-EMPHA DE-EMPHA DE-EMPHA CTL OUT2 IN3
BUFFER OUT2
INPUT2
20
19
18
17
16 Vcc
15
14
13
12
11
LPF2
+
+
1/2Vcc-AMP
DE-AMP2
+
+ BUFFER2
BUFFER1 +
-
MUTE SW
DE-EM SW
+
-
+
-
LPF1
DE-AMP1
1
GND
2
LPF OUTPUT1
3
LPF1B
4
MUTE CONTROL INPUT
5
6
7
8
9
10
INPUT1
DE-EMPHA DE-EMPHA DE-EMPHA DE-EMPHA BUFFER CONTROL CTL OUT1 IN1 OUT1 INPUT
Fig. 1
KA9270
ABSOLUTE MAXIMUM RATINGS (Ta = 25C)
Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD T OPR T STG Value 16 550 -20 ~ + 75 -45 ~ + 150
AUDIO FILTER
Unit V W C C
ELECTRICAL CHARACTERISTICS
(Ta = 25C, VCC = 8V, f = 1KHz, RL = 10K, De-emphasis; off, Mute; off, S1 & S2; off, unless otherwise specified) Characteristic Quiescent Circuit Current Maximum Output Voltage Symbol ICC VOM VI = 0 THD = 1% f = 100Hz f = 1KHz Total Harmonic Distortion THD VO = 0dBm f = 10KHz f = 16KHz f = 20KHz f = 100Hz f = 1KHz Frequency Characteristics fv VO = 6dBm f = 10KHz f = 16KHz f = 20KHz f = 100Hz Cross Talk CT VO = 0dBm f = 1KHz f = 10KHz Signal to Noise Ratio Channel Balance Open Loop Gain Gain Adjusting Range Mute Attenuation Ratio De-emphasis S/N CB GVO GVR ATTMUTE DEEMPH VO = 0dBm, RG = 600 20KHz LPF VO = 0dBm VI = 900mVrms VI = 900mV, S1, S2; ON VI = 900mV, Mute SW; ON f = 1KHz De-emphasis: ON f = 5KHz f = 16KHz Note: De-emphasis input conditions: VO = 0dBm De-emphasis off position -0.1 0 -0.5 -1.0 -1.5 70 65 60 73 -1.0 -2.6 4.5 40 -0.87 -6.03 -10.53 Test Conditions Min 1 1.8 Typ 4 2.1 0.01 0.01 0.05 0.1 0.1 0 0 0 0 0 80 75 65 80 0 -0.6 6 50 -0.37 -4.53 -9.03 0.13 -3.03 -7.53 dB 1.0 1.0 dB dB dB dB dB dB 0.05 0.05 0.1 0.2 0.2 0.1 0 0.5 1.0 1.5 dB % Max 6 Unit mA Vrms
KA9270
AUDIO FILTER
TEST CIRCUIT
CH2 OUTPUT (Vo) 10K
3.3 + 1/2 Vcc 0.0015 47 0.01 Vcc 330pF + 5.6K 5.6K + 4.7 20 19 18 17 16 Vcc 1/2 Vcc LPF2 15 14 13 12 11 + VI 4.7 5.6K
0.0012
1M
12K 27K 27K 5K
+
CH2-INPUT (from SIGNAL GENERATOR OUTPUT)
+
+
DE-AMP2
+
+ BUFFER2
BUFFER1 +
-
MUTE SW
DE-EM SW
+
-
+
-
LPF1
DE-AMP1
1
2
3 5.6K 330pF
4
5
6
7
8
9 +
10
5.6K 5.6K
27K
27K
4.7 5K
CH1-INPUT (from SIGNAL GENERATOR OUTPUT)
CH1 OUTPUT (Vo)
+ 3.3
0.0015 10K
MUTE CONTROL SIGNAL (MUTE)
DE-EMPHASIS CONTROL SIGNAL (DE-EM)
+ VI -
0.0012
12K
1M
Fig. 2
KA9270
APPLICATION INFORMATION
1. BUFFER
AUDIO FILTER
INPUT
+
(from D/A Converter Output)
-
to De-emphasis input
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 Low De-emphasis Operation ON OFF
b) De-emphasis characteristic at the de-emphasis ON
R5
C1
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
3. MUTE
R QON
AUDIO FILTER
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; M (att) = 20 log VO VI = 20 log RQON (dB) R6
4. LOW PASS FILTER
R1 R3 Vi C4 C3 R2
+
Fig. 6 Equivalent Circuit of LPF Cut off frequency (FC) is as follow: fC = 1 2R2 R1 C3 C4 (Hz)
KA9270
APPLICATION CIRCUIT
3.3 + CH2 OUTPUT
AUDIO FILTER
RL 10K
R12 5.6K
1/2 Vcc C9
1M
Vcc C10 330p 5.6K R11 20 19 18
120uP 1500p
12K R9 27K R8 27K R7 + 14 13 12 4.7i C8
4.7i + +
C8
C7 5.6K R10
CH2-INPUT (from DAC OUTPUT)
10i 17 16 Vcc 15
11
LPF2
+
+
DE-AMP2
+
+ BUFFER2
BUFFER1 +
-
MUTE SW
DE-EM SW
+
-
+
-
LPF1
DE-AMP1
1
2
3 5.6K
4
5
6
7
8
9 +
10
CH1 OUTPUT (Vo)
+
330p C5 3.3i
R2 C3
MUTE CONTROL SIGNAL (MUTE) DE-EMPHASIS CONTROL SIGNAL (DE-EM)
+
C4
R1
1500p
10u
R3 5.6K C2 1200p
R4 27K
R6 27K
C7 4.7i
RL 10K
12K
CH1-INPUT (from DAC OUTPUT)
1M
Fig. 7
KA9270
AUDIO FILTER
(PCB PATTERN)


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