SM7186

三合微科股份有限公司

    SM7186 DESCRIPTIONS: SM7186 i s an Audio Echo Processor using CMOS Technology. It has built-in AD/DA and 48KBits SRAM for time delay. External Resister adjust large range oscillation frequency and control delay time. Many combination to fit your applications. FEATURE: * Built-in adjustable OSC. * Built-in power on reset circuit. * Built-in 48KBits SRAM for delay control. * Adjustable delay time setting: 30ms ~ 700ms * Low operating current. APPLICATIONS: * * * * * * VCD Karaoke TV Audio System Car Stereo VCR VDD VREF AGND DGND OSCO OSCR DACTL ADCTL 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 OP1-IN OP1-OUT OP2-OUT OP2-IN DAC-OUT DAC-IN ADC-IN ADC-OUT MAR. 2000 Page 1 三合微科股份有限公司

    PIN DESCRIPTION PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME VDD VREF AGND DGND OSCO OSCR DACTL ADCTL ADC-OUT ADC-IN DAC-IN DAC-OUT OP2-IN OP2-OUT OP1-OUT OP1-IN I/O Power AI/O Power Power OSC OSC AIN AIN AOUT AIN AIN AOUT AIN AOUT AOUT AIN FUNCTION Positive power supply Analog reference voltage Analog negative power supply Digital negative power supply System clock output Add resistor to modify internal OSC DAC control ADC control ADC OP output ADC OP input DAC OP input DAC OP output OP2 input OP2 output OP1 output OP1 input Page 2 三合微科股份有限公司

    BLOCK DIAGRAM D A C T L D A C I N D A C O U T A D C O U T A D C I N A D C T L OP1-IN OP2-IN Low Pass Filter Mix AD Converter VDD AGND DGND SRAM Low Pass Filter OP1-OUT OP2-OUT DA Converter OSCO OSC Verf POR Digital Control OSCR VREF Page 3 三合微科股份有限公司

    Echo Mode & Surround Mode Audio out Low Pass Filter Audio In Add Low Pass Filter DA Converter Echo Mode AD Converter SRAM Audio In Low Pass Filter AD Converter SRAM Audio Out Low Pass Filter DA Converter Surround Mode Page 4 三合微科股份有限公司

    DELAY TIME TABLE OSCR 160K 75K 33K 24K 18K 11K 6.8K 4.7K 3.3K 2.4K 1.8K 1.5K 1.1K 820 Fosc (MHz) 1.047 1.989 3.935 4.893 5.974 7.977 9.99 11.84 13.72 15.94 18.18 19.68 22.05 23.87 Delay Time ms 737.28 368.64 184.32 160.00 122.88 92.16 73.73 61.44 52.66 46.08 40.96 36.86 33.51 30.72 Page 5 三合微科股份有限公司

    AC CHARACTERISTICS ( Vcc = 5.0V, f in = 1KHz, Vi = 100mVrms, fck = 4.608MHz, Ta = 25 C, unless otherwise noted ) SYMBOL Icco Gv Vomax THD No PSRR Tmute PARAMETER Supply current Voltage gain Maximum output voltage Output distortion Output noise voltage Power supply rejection ratio Mute time Vcc = -20dBV f = 100Hz RL = 47K THD = 10% 0.8 Test condition Min Typ Max Unit 10 -0.5 1.4 0.38 0.9 -85 -40 560 600 20 2.5 mA dB Vrms % o -70 dBV -25 dB 640 msec DC CHARACTERISTICS Symbol Vcc Icc V IH V IL Parameter Supply voltage Supply current "H" input voltage "L" input voltage 0.7V 0.3V Limits Min Typ Max 4.5 5 10 5.5 20 Unit V mA V V Page 6 三合微科股份有限公司

    ABSOLUTE MAXIMUM RATINGS ( Ta = 25 C, unless otherwise noted ) o Symbol Vcc Icc Pd Topr Tstg Decription Supply voltage Supply current Power dissipation Operation temperature Storage temperature Limits 6.5 100 1.7 -20 ~ 75 -25 ~ 125 Unit V mA W o o C C Page 7 三合微科股份有限公司

    MIC PRE-AMP CIRCUIT MIC 1 C 0.02 F +12V 1F 1K 560 15K 47K 22 F 5 6 + 47K 4.7K 7 10 F 20K MIC 2 C 0.02 F 20K 1F +12V 15K 47K 1K 100pFs ~ 820pF 1K 560 22 F 3 2 + 47K 1 4 10 F 4.7K OUTPUT 4.7K 100pFs ~ 820pF 4.7K 100 F Page 8 三合微科股份有限公司

    ECHO MODE APPLICATION CIRCUIT(MODIFIED) 3900pF 15K 4.7 µ F 100K INPUT +5V 10K 4.7 µ F 1 0.1µ F 100µF 47 µ F 16 560pF 10K 4.7K 5.6K 10 µ F 10K 10 µ F 2 3 15 14 0.01 µF 50K OUTPUT SM7186 4 5 OSCR R 13 15K 12 560pF 3300pF 6 7 11 0.082 µ F 10K 10 9 10K 0.082 µF 0.1 µ F 8 0.1 µ F 1. Pin 6 R is approximate 1K~160k Ω . 2. 3. Represent Analog Ground. Represent Digital Ground. V.1.0, 2000 Page 9 NOV. 2000 三合微科股份有限公司

    SURROUND MODE APPLICATION CIRCUIT INPUT OUTPUT 100K 4.7 F 2.7K 5600pF 15K 10K 15K 10K 15K 0.1 F 560pF 560pF 15K 10 F 0.1 F 5600pF 16 15 14 13 12 11 10 19 SM7186 11 12 13 14 15 NC 100 F 0.1 F +5V 47 F 16 R *10K 17 18 0.1 F 0.1 F 0.1 F 20K Page 10