n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT DESCRIPTION The M65853 is a CMOS IC built-in Digital Echo function with microphone peripheral circuits for "Karaoke" equipment packed in a single chip. It is suitable for "Karaoke" equipments such as Video CD Player, Mini Stereo, CD-Radio Cassette, TV or VCR. FEATURES • • • • • • • Built-in automatic reset circuit activated with power on • 5V single power supply RECOMMENDED OPERATING CONDITION • Supply voltage range • • • • • Vcc = 4.5 ~ 5.5V Rated supply voltage • • • • • Vcc = 5V PIN CONFIGURATION MCLKCONT 1 42 MIC SW VALC 2 41 DATA MIC1IN 3 40 CLOCK ALC1 4 39 LATCH MIC1NFIN 5 38 PS2 MIC1OUT 6 MIC1VOLIN 7 MIC2IN 8 ALC2 9 MIC2NFIN 10 MIC2OUT 11 MIC2VOLIN 12 MICOUT 13 LPF1IN1 14 LPF1IN2 15 LPF1OUT 16 M 6 5 8 5 3 F P • High performance digital echo circuit thanks to 16Kbit memory Built-in surround function which works Simulated Stereo for monaural source and Stereo Surround for stereo source ALC-equipped microphone amplifiers permit excessively high input. ALC operating voltage can be set as desired. 2 microphone volumes, echo effect volume and echo feedback volume are included Stereo microphone-line mixing amplifiers Karaoke entertainment functions such as vocal cut and automatic vocal support system Built-in current-control oscillation circuit 37 PS1 36 35 LOU T ROUT 34 VCFIL 33 LIN1 32 RIN1 31 LIN2 30 RIN2 29 VOL IN 28 LPF2OUT 27 LPF2IN2 ADINTOUT 17 26 LPF2IN1 ADINTIN 18 25 DAINTOUT ADCONT 19 24 DAINTIN REF 20 23 DACONT 22 VCC GND 21 SYSTEM CONFIGURATION Lch1 INPUT SOURCE SELECTOR MIX Lch OUTPUT MIX Rch OUTPUT L Lch2IN PUT Rch1 INPUT PHASE SHIFTER SURROUND R (L+R)/2 VOCAL CUT Rch2IN PUT ALC MIC VOL MIC MIX ECHO ALC MIC MIX MIC VOL ECHO VOL FEEDBACK VOL MITSUBISHI ELECTRIC ( 1 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT DATA CLOCK LATCH PS2 PS1 LOUT ROUT VCFIL LIN1 RIN1 LIN2 RIN2 VOL IN LPF2OUT LPF2IN2 LPF2IN1 DAINTOUT DAINTIN DACONT 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 µ-COM PHASE SHIFTER SURROUND I/F L R 22 Vcc D/A LPF (L+R) / 2 VCC MIC SW PIN CONFIGURATION STEREO MIC SW ECHO VOL ECHO F.BVOL 16kbit SRAM MAIN LOGIC MIC VOL MIC VOL LPF A/D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 VALC MIC1IN ALC1 MIC1NFIN MIC1OUT MIC1VOLIN MIC2IN ALC2 MIC2NFIN MIC2OUT MIC2VOLIN MICOUT LPF1IN1 LPF1IN2 LPF1OUT ADINTOUT ADINTIN ADCONT 1/2Vcc MCLKCONT ALC MITSUBISHI ELECTRIC ( 20 GND 21 GND ALC REF MCLK 2 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT PIN DESCRIPTION Pin No. Symbol Nam I/O Clock control — 1 MCLKCONT 2 VALC 3 MIC1IN 4 ALC1 5 MIC1NFIN Microphone 1 negative feedback input I 6 MIC1OUT Microphone 1 output O 7 MIC1VOLIN Microphone 1 volume input I 8 MIC2IN Microphone 2 input I 9 ALC2 10 MIC2NFIN Microphone 2 negative feedback input I 11 MIC2OUT Microphone 2 input I 12 MIC2VOLIN Microphone 2 volume input I 13 MICOUT Microphone output 14 LPF1IN1 Low pass filter 1 input 1 I 15 LPF1IN2 Low pass filter 1 input 2 I 16 LPF1OUT Low pass filter 1 output O 17 ADINTOUT A/D integrator output O 18 ADINTIN A/D integrator input I 19 ADCONT A/D control 20 REF Reference power output 21 GND Ground ALC operating voltage setting terminal Microphone 1 input ALC1 control ALC2 control Function Controls built-in clock generation circuit with external R To set ALC operating voltage according — to applied voltage I To connect MIC1 To connect ALC1 attack / recovery time — setting capacitor To connect low cut-off frequency of MIC1 amplifier setting capacitor To connect capacitor to reduce noise generated at time of volume change To connect MIC2 To connect ALC2 attack/recovery time — setting capacitor To connect low cut-off frequency of MIC2 amplifier setting capacitor To connect capacitor to reduce noise generated at time of volume change O Mixing output of MIC1 and MIC2 Pre-filter before A/D convertor for digital delay Composes D/A conversion integrator with external capacitor To determine adaptive time constant of — A/D convertor with ADM system — To connect 1/2 Vcc output and filter capacitor — MITSUBISHI ELECTRIC ( 3 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som Pin No. 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT Symbol Nam I/O Function 22 VCC Power supply — 23 DACONT D/A control — D/A convertor with ADM system 24 DAINTIN D/A Integrator input I 25 DAINTOUT D/A integrator output O 26 LPF2IN1 Low pass filter 2 input 1 I 27 LPF2IN2 Low pass filter 2 input 2 I 28 LPF2OUT Low pass filter 2 output O 29 VOLIN Echo effect / Echo feed back volume input I To connect capacitor to reduce noise generated at time of volume change 30 RIN2 Rch line input2 I Rch line input2 31 LIN2 Lch line input2 I Lch line input2 32 RIN1 Rch line input1 I Rch line input 1 33 LIN1 Lch line input1 I Lch line input1 34 VCFIL Vocal cut filter 35 ROUT Rch output O Rch mixing output 36 LOU Lch output O Lch mixing output 37 PS1 Phase shift input 1 I 38 PS2 Phase shift input 2 I 39 LATCH LATCH I Latch input via serial bus 40 CLOCK CLOCK I Clock input via serial bus 41 DATA DATA I Data input via serial bus 42 MIC SW I L: MIC OFF H: MIC ON To determine adaptive time constant of Composes D/A conversion integrator with external capacitor Post-filter after D/A convertor for digital delay — Processes frequencies lower than the vocal band Determines a constant at time of phase shift Microphone SW MITSUBISHI ELECTRIC ( 4 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT ELECTRICAL CHARACTERISTICS ( Vcc=5V,f=1kHz,vi=100mVrms,Ta=25°C Unless otherwise noted ) Limits Mic volume Microphone amplifier TOTAL Symbol Test conditions Min Typ Max — 35 mA 47 dB Unit Icc Circuit current No signal provided Gvo Amplifier gain Vo = -17dBV THD1 Distortion Vo = -17dBV,with ALC not operated — 0.1 0.5 % THD2 Distortion Vi= -37dBV,with ALC operated — 3.0 6.0 % ALC operating voltage VoALC measurement error measurement : -10 to +3dBV -3 0 +3 dB TALCAT ALC attack time C=4.7µF 25 40 55 msec TALCRE ALC recovery time C=4.7µF 1.0 1.5 2.0 sec VoMAX Maximum output voltage THD=10% 1.3 1.4 — Vrms No Output noise voltage — -68 -57 dBV Zi Input impedance 5 10 20 K Gv I/O voltage gain Volume max -3 0 +3 dB ATTmax Maximum attenuation Volume min — -72 -67 dBV THD Distortion Volume max — 0.15 0.30 % ViMAX Maximum input voltage THD=10% 1.4 1.7 — Vrms Output noise voltage JIS - A — -96 -90 dBV I/O voltage gain Volume max -3 0 +3 dB ATTmax Maximum attenuation Volume min — -72 -67 dBV THD Volume max — 0.15 0.30 % 1.1 1.4 — Vrms — -96 -90 dBV No Echo effect / Echo feed back volume Parameter Gv Distortion Gv=47dB,f=100 to 5KHz VoMAX Maximum output voltage THD=10% No Output noise voltage JIS - A MITSUBISHI ELECTRIC ( 5 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som Digital echo Symbol Gv Digital echo Parameter Test conditions I/O voltage gain Delay Time Min Limits Typ Max Unit -3 0 +3 dB 1.1 1.4 — Vrms 98.3 msec 131.1 msec 147.5 msec 196.6 msec Sets Delay time with microcomputer. Td=98.3mS,30KHzLPF 1.0 1.0 2.0 % Td=131.1mS,30KHzLPF 1.5 1.5 3.0 % Td=147.5mS,30KHzLPF 1.5 1.5 3.0 % Td=196.6mS,30KHzLPF 2.0 2.0 4.0 % Vi=0mVrms,JIS - A Td=98.3msec,Rg=620 -72 -87 — dBV Vi=0mVrms,JIS - A Td=131.1msec,Rg=620 -70 -85 — dBV Vi=0mVrms,JIS - A Td=147.5msec,Rg=620 -70 -85 — dBV Vi=0mVrms,JIS - A Td=196.6msec,Rg=620 -67 -82 — dBV -3 0 +3 dB 30KHzLPF — 0.02 0.04 % VoMAX Maximum output voltage THD=10% 1.1 1.7 — Vrms No Output noise voltage JIS - A,MIC SW OFF -90 -95 — dBV CS Channel separation Lin=400Hz,Rout JIS - A Zi Input impedance Grej Vocal removal ratio THD No LINE KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT VoMAX Maximum output voltage THD=10% Td 50 S E RI ES Distortion Output noise voltage Gv I/O voltage gain THD Distortion Vocal cut MITSUBISHI ELECTRIC -70 dB 10 20 30 KHz 14 18 — dB ( 6 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT ABSOLUTE MAXIMUM Symbol Nam Test conditions Ratings Units Vcc Supply voltage 6.0 V Vi Circuit current -0.3 ~ Vcc+0.3 V Pd Input Voltage Operating temperature Storage temperature 1.1 W -20 ~ +75 °C -40 ~ +125 °C Topr Tstg RECOMMENDED OPERATING CONDITION Limits Symbol Parameter Test conditions Units Min Typ Max Vcc Supply voltage 4.5 5 5.5 V VIL L input level 0 — 0.3VDD V VIH H input level 0.7VDD — VDD V MITSUBISHI ELECTRIC ( 7 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION DESCRIPTION OPERATION MODE Operating modes can be set with serial data 16-bits entered at the timing given below. DATA(pin39) is taken inside at the rising edge of CLOCK(pin38) and the last-packed 16-bits are latched at the raising edge of LATCH(pin37). 37 LATCH 38 CLOCK 39 DATA D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 time DATA FUNCTION DATA FUNCTION Control description D0 D1 D0 D1 D2 Digital echo Creates four kinds of delay signals between 98.3msec and 196.6msec. D3 D6 Desired audio source operation to each "karaoke" software can be selected by the Source selector. 5 kinds D7 Phase shifter D8 surround Surround is formed with phase shifter to increase the ambience of sound even when karaoke is used. D0="L" Source D5 selector If you are in discomfort from unknown Auto vocal song, the vocal of the singer can be output support you. D9 support ON / OFF Selector switch for turning on/off of auto vocal support. Line input D10 selector MIC SW D11 ON / OFF D12,D13 D15 Echo D2 effect Volume D3 Sets volume attenuation in 8 steps between +3dB and - . D4 Echo Feed D5 Back Volume D6 Sets volume attenuation in 5 steps between -2dB and - . D7 D0="H" D4 D14 Control description Selector switch for changing line input of Lch and Rch. Selector switch for turning on/off of microphone signal mixing. MIC1 D8 Volume Sets volume attenuation in 8 steps between 0dB and - . D9 D10 D11 MIC2Vol ume Sets volume attenuation in 8 steps between 0dB and - . ADDRESS Data is taken inside D14=[L],D15=[H],and others cancel. D12 D13 TEST mode Data is taken inside ADDRESS D14=[L],D15=[H],and others cancel. MITSUBISHI ELECTRIC D14 D15 ( 8 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION CONTROL • DELAY TIME CONTROL • SOURCE SELECTOR Control Data Control Data Delay time D0 D3 D2 D1 D0 D6 D5 D4 Source select L L — 98.3msec L L L Lch, monaural L H — 131.1msec L L H Rch, monaural H L — 147.5msec L H — (L+R) / 2 H H — 196.6msec H L — Vocal cut H H Delay off mode H H — L H L • PHASE SHIFTER SURROUND CONTROL Control Data PHASE SHIFTER SURROUND D0 D8 D7 L Surround SW Effect • AUTO VOCAL SUPPORT SWITCH Control Data Auto vocal support SW D0 D9 OFF L Stereo L OFF H ON L L H H L H H LOW L ON MID HIGH • SELECT LINE IN SWITCH Control SELECT Data LINE IN SW D0 D10 L • MICROPHONE MIXING SWITCH Control Data Remar MIC SW k D0 D11 Remar k OFF Select to LIN1/RIN1 ON Select to LIN2/RIN2 L L OFF Microphone mixing OFF H ON Microphone mixing ON L H MITSUBISHI ELECTRIC ( 9 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT VOLUME CONTROL • Echo effect volume attenuation • Echo FEEDBACK volume attenuation Control Data Attenuation Control Data Attenuation D0 D3 D2 D1 (dB) D0 D6 D5 D4 (dB) L L L +3 L L L -2 L L H 0 L L H -3 L H L -3 L H L -5 L H H -6 L H H -7 H L L -9 H L L - H L H -12 H H L -15 H H H - H H • Microphone volume attenuation Control Data D9 D8 D7 MIC1 Volume Attenuation D0 (dB) D12 D11D10 MIC2 Volume L L L 0 L L H -3 L H L -6 L H H -9 H L L -12 H L H -15 H H L -18 H H H - H • ADDRESS CONTROL Control Data ADDRESS D0 D15D14 L L Data Cancel L H H L Data take inside H H Data Cancel L,H MITSUBISHI ELECTRIC ( 10 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION DESCRIPTION (1) AUTO RESET Settings are reset automatically when the IC is powered up. The reset state is automatically canceled approximately 150msec after powering up(Vcc=5V and the capacitor connected to pin C=100µF). By auto reset, operation mode setting become as follows. •Delay Time Control : 98.3msec •Source Selector : stereo •Phase Shifter Surround Control : OFF •Auto Vocal support Switch : OFF •Select Line IN Switch LIN1,RIN1 •Microphone Mixing Switch : OFF •Echo Feed back Volume : •Echo effect Volume : •Microphone Volume Attenuation : -10dB (2) AUTO MUTE FUNCTION The IC carries out auto mute function at the time of powering up, delay time setting change, in order to suppress shock noise that the digital delay may produce. •At power up Reset Time Mute time (400msec) •At delay time setting change Delay signal before change Delay signal after change Mute time (400msec) MITSUBISHI ELECTRIC ( 11 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT (3) Clock oscillator circuit This IC incorporates a current control type clock oscillator circuit in it, thus providing circuit configuration just by connecting an Rc for current control pin 1 (MCLKCONT). Fully internal clock supply prevents occurrence of undesired radiation without affecting any external circuit. The oscillator frequency fck is following. fck = 4 MHz(Rc=22K ) Rc DC Current Clock oscillator circuit 1 Clock frequency:fck (4) Microphone amplifier The gain(Gv) and low cut-off frequency(fcl) of microphone amplifier are expressed as follows. REF 1 R1+1.5K+334K fcl= Gv=20log• 2 •(R1+1.5K)•C1 R1+1.5K 10k Assuming Gv=37dB, fcl=220Hz,for instance, the constants take the following values. (typ) 3 MIC Gv(max)=47dB,fcl=225Hz R1=0 ,C1=0.47µF 10k 0.22µF 334k 1.5k 5 R1=3.3K ,C1=0.15µF 6 R1 C1 MITSUBISHI ELECTRIC ( 12 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT (5)ALC level diagram Vo(dBV) ALC OPERATING VOLTAGE SETTING RANGE 10 +3 0 -10 -20 MICROPHONE AMPLIFIER GAIN SETTIG=47dB -30 -70 -60 -50 -40 -30 -20 -10 Vi(dBV) (6)ALC operating voltage setting ALC operating voltage can be set at a desired value between -10 and +3dBV by varying the DC voltage applied to pin 35 (ALC operating voltage setting terminal). (Setting method) 1 2.5V( 2 Vcc) INTERNAL DC BIAS ONE SIDE PEAK VOLTAGE,Vpo VOLTAGE APPLIED TO 35 PIN,VALC VALC= OV 1 2 Vcc-Vpo Vcc To set ALC operating voltage at -5dB(Vcc=5V) 51k -5dBV=0.56Vrms=1.59Vp-p=0.8Vp-o VALC=2.5-0.8=1.7V Since the input impedance at pin 35 is high at 1M or more, it is possible to provide ALC operating voltage by dividing resistance. When Vcc=5V ALC operating voltage (dBV) +3 0 -2 -4 -6 -8 -10 Voltage applied to pin 35 VALC(V) 0.50 1.09 1.38 1.61 1.79 1.94 2.05 MITSUBISHI ELECTRIC 35 R Resistance R( 0.01µ ) 5.6k 15k 20k 24k 27k 33k 36k ( 13 / 17 ) MITSUBISHI SOUND PROCESSOR ICs 50 S E R I E S M65853FP KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT (7) Input and output LPF for the digital echo The input and output LPF for the digital echo are configured as shown. figure below. C2:1000pF C1:4700pF 15 14 16 24k 24k 24k Input Output The accuracy of the internal resistance of the IC is approximately ±30% Cut-off frequency(fc) is given as follows. fc= 1 2πX24k X C1XC2 = 1 2πX24k X 3.1KHz 4700pFX1000pF Quality factor (Q) is given by the following equation for long echo. Q= 1 3 C1 C2 0.72 (Figure of 0.7 is recommended) MITSUBISHI ELECTRIC ( 14 / 17 ) MITSUBISHI SOUND PROCESSOR ICs 50 S E R I E S M65853FP KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT (8) Auto vocal support If you can not continue sing a song, the reference vocal from the source will support you automatically. Signal Detection Source selector mode On Lch monaural vocal cut Off (L+R)/2 (L+R)/2 Stereo Rch monaural (L+R)/2 same as above The timing of microphone input signal detection Reference level (REF+20mV) Microphone input level output release time 1.5s microphone signal detection attack time 0s OFF On MITSUBISHI ELECTRIC On ( 15 / 17 ) MITSUBISHI SOUND PROCESSOR ICs 50 S E R I E S M65853FP KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT (9) Vocal cut support The sound components of the same phase and same sound volume in the L and R channels are attenuated. This made also allows components with lower frequency than the vocal band to pass through the filter, to compensate insufficient low-frequency sound. Lch INPUT vocal cut block OUTPUT Rch INPUT 33 C 0.15µ 1 fvc= =53.0Hz 2πCR LPF is formed by the internal R (20k ) and the external C, where C=0.15µF , cut off frequency is 53Hz. (10)Following is the phase shifter block, which makes phase surround effect. Phase Shifter Surround Lch INPUT Lch OUTPUT 36 C(external)=0.022µF 37 Rch INPUT Rch OUTPUT Surround Source selector L R Simulated Stereo (L+R)/2 Vocal cut Stereo Stereo Surround MITSUBISHI ELECTRIC ( 16 / 17 ) n. atio ange. Y c i f i A R pec o ch MITSUBISHI SOUND PROCESSOR ICs t ls fina bject IMIN ot a e su M65853FP L is n ar P RicEe ; Theistric limits Not param e som 50 S E RI ES KARAOKE DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT APPLICATION EXAMPLE RIN2 LIN2 RIN1 LIN1 ROUT LOUT LATCH DATA CLOCK MIC SW Vcc 0.0047µ 1µ 41 42 1µ 1µ 40 µ-COM 39 0.022µ 38 37 1µ 36 1µ 35 0.15µ 1µ 34 PHASE SHIFTER SURROUND I/F 33 1µ 32 31 0.22µ 0.001µ 1µ 1µ 30 28 29 27 26 25 24 L R 23 0.1µ 22 Vcc D/A LPF (L+R) / 2 0.1µ 100µ 0.068µ STEREO MIC SW ECHO VOL ECHO F.BVOL 16kbit SRAM MAIN LOGIC MIC VOL MCLK MIC VOL 2 1 4 3 LPF ALC ALC 5 6 8 7 9 10 11 12 13 14 15 A/D 16 17 1/2Vcc 18 19 22 k 20 GND 21 100µ 4.7µ Vcc 0.22µ 4.7µ 1µ 0.1µ 0.22µ 0.022µ 1µ 0.001µ 0.1µ 0.0047µ 0.068µ 0.1µ Vcc 10 k MIC1IN 51k 0.01µ 10 k MIC2IN Unit R : C:F 22k MITSUBISHI ELECTRIC ( 17 / 17 )