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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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