KA9270 monolithic integrated circuit designed audio filter. used compa
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KA9270
KA9270 monolithic integrated circuit designed audio filter. used compact disc player, digital audio tape recorder, etc.
AUDIO FILTER
20-DIP-300A
FEATURES
Functions: Buffer impedence matching pass filter emphasis control Mute control Reference voltage circuit Gain adjustable audio output Minimum number external parts required Recommand operation supply voltage range 12.0V Device KA9270 KA9270D
20-SOP-375
Package 20-DlP-300A 20-SOP-
Operating Temperature 20°C +75°C
BLOCK DIAGRAM
OUTPUT2
LPF2B
VREF
RIPPLE
DE-EMPHA DE-EMPHA DE-EMPHA OUT2
BUFFER OUT2
INPUT2
LPF2
1/2Vcc-AMP
DE-AMP2
BUFFER2
BUFFER1
MUTE
DE-EM
LPF1
DE-AMP1
OUTPUT1
LPF1B
MUTE CONTROL INPUT
INPUT1
DE-EMPHA DE-EMPHA DE-EMPHA DE-EMPHA BUFFER CONTROL OUT1 OUT1 INPUT
Fig.
KA9270
ABSOLUTE MAXIMUM RATINGS 25°C)
Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol Value
AUDIO FILTER
Unit
ELECTRICAL CHARACTERISTICS
25°C, 1KHz, 10K, De-emphasis; off, Mute; off, off, unless otherwise specified) Characteristic Quiescent Circuit Current Maximum Output Voltage Symbol 100Hz 1KHz Total Harmonic Distortion 0dBm 10KHz 16KHz 20KHz 100Hz 1KHz Frequency Characteristics 6dBm 10KHz 16KHz 20KHz 100Hz Cross Talk 0dBm 1KHz 10KHz Signal Noise Ratio Channel Balance Open Loop Gain Gain Adjusting Range Mute Attenuation Ratio De-emphasis ATTMUTE DEEMPH 0dBm, 20KHz 0dBm 900mVrms 900mV, 900mV, Mute 1KHz De-emphasis: 5KHz 16KHz Note: De-emphasis input conditions: 0dBm De-emphasis position -0.1 -0.5 -1.0 -1.5 -1.0 -2.6 -0.87 -6.03 -10.53 Test Conditions 0.01 0.01 0.05 -0.6 -0.37 -4.53 -9.03 0.13 -3.03 -7.53 0.05 0.05 Unit Vrms
KA9270
AUDIO FILTER
TEST CIRCUIT
OUTPUT (Vo)
330pF 5.6K 5.6K LPF2 5.6K
CH2-INPUT (from SIGNAL GENERATOR OUTPUT)
DE-AMP2
BUFFER2
BUFFER1
MUTE
DE-EM
LPF1
DE-AMP1
5.6K 330pF
5.6K 5.6K
CH1-INPUT (from SIGNAL GENERATOR OUTPUT)
OUTPUT (Vo)
MUTE CONTROL SIGNAL (MUTE)
DE-EMPHASIS CONTROL SIGNAL (DE-EM)
Fig.
KA9270
APPLICATION INFORMATION
BUFFER
AUDIO FILTER
INPUT
(from Converter Output)
De-emphasis input
Fig. used impedance matching, between converter output de-emphasis input.
DE-EMPHASIS
De-emphasis operation condition Control Input High De-emphasis Operation
De-emphasis characteristic de-emphasis
Fig. Equevalent Circuit De-emphasis Mode
de-emphasis charcteristics dependent external parts value.
KA9270
MUTE
AUDIO FILTER
Where: RQON internal resistance
Fig. Equivalent Circuit Mute Switch Mode Mute attenuation (att)] ratio follow; (att) RQON (dB)
PASS FILTER
Fig. Equivalent Circuit frequency (FC) follow: (Hz)
KA9270
APPLICATION CIRCUIT
OUTPUT
AUDIO FILTER
5.6K
330p 5.6K
120uP 1500p
5.6K
CH2-INPUT (from OUTPUT)
LPF2
DE-AMP2
BUFFER2
BUFFER1
MUTE
DE-EM
LPF1
DE-AMP1
5.6K
OUTPUT (Vo)
330p
MUTE CONTROL SIGNAL (MUTE) DE-EMPHASIS CONTROL SIGNAL (DE-EM)
1500p
5.6K 1200p
CH1-INPUT (from OUTPUT)
Fig.
KA9270
AUDIO FILTER
(PCB PATTERN)
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