三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7181 ECHO REV. 1.20 DECEMBER 31, 2004 The information in this document is subject to change without notice. c SAMHOP Microelectronics Corp. All Rights Reserved. 台北縣新店市民權路100號7樓 7F,No.100,Min-Chyuan Road, Hsintien, Taipei Hsien, Taiwan, R.O.C. TEL: 886-2-2218-3978/2820 FAX: 886-2-2218-3320 Email : [email protected] Page 1 SM7181 SAMHOP Microelectronics Corp. ECHO DESCRIPTIONS FEATURE SM7181 is an Audio Echo Processor using CMOS Technology. It has build in AD/DA and 8KBits SRAM for echo effect time delay. * Buildin adjustable OSC. * Buildin power on reset circuit. * Buildin 8KBits SRAM for delay control. * By change oscillator resistor to adjust echo effect time. APPLICATIONS * * * * * VCD Karaok TV Audio System Car Stereo VREF 1 16 OP1-IN OSC1 2 15 OP1-OUT OSC2 3 14 ADC-OUT VDD 4 13 ADC-IN DGND 5 12 DAC-IN AGND 6 11 DAC-OUT ADCTL 7 10 OP2-IN DACTL 8 9 OP2-OUT SM7181 DIP 16 Page 2 V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO PIN DESCRIPTION PIN NO. PIN NAME I/O FUNCTION 1 VREF AI/O Analog referance voltage 2 OSC1 IN 3 OSC2 OUT 4 VDD Power Power 5 DGND Power Digital negative power supply 6 AGND Power Analog negative power supply 7 ADCTL AIN ADC control 8 DACTL AIN DAC control 9 OP2-OUT AOUT OP2 output 10 OP2-IN AIN OP2 input 11 DAC-OUT AOUT DAC OP output 12 DAC-IN AIN DAC OP input 13 ADC-IN AIN ADC OP input 14 ADC-OUT AOUT ADC OP output 15 OP1-OUT AOUT OP1 output 16 OP1-IN AIN OP1 input Oscillator AI/O: Analog input/output AIN: Analog input AOUT: Analog output Page 3 V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO BLOCK DIAGRAM D A C T L OP1-IN Low Pass Filter D A C D A C A D C A D C I N O U T O U T I N A/D Converter A D C T L VDD OP2-IN DGND Mix OP1-OUT AGND Low Pass Filter OP2-OUT D/A Converter OSC1 OSC VREF Digital Control POR OSC2 SRAM VREF Page 4 V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO Echo Mode SM7181 digitize the audio signal through A/D converter and store the value in a First-in- First-out 8Kbits SRAM. After 32768 Tsec ( T is the period of oscillator) of delay time the value sto re in the SRAM will be read out and reconstruct by D/A converter then add with the present sound to b ecome an echo signal output. The echo delay is control by the RC of Pin 2, Pin 3. Audio out Low Pass Filter A/D Converter Add Audio In SRAM Low Pass Filter D/A Converter Echo Mode ABSOLUTE MAXIMUM RATINGS o ( Ta = 25 C, unless otherwise noted ) Symbol Description Limits Unit Vcc Supply voltage 6.5 V Icc Supply current 100 mA Pd Power dissipation 0.9 W Topr Operation temperature -20 ~ 75 Tstg Storage temperature -25 ~ 125 Page 5 o C oC V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO AC CHARACTERISTICS o ( Vcc = 5.0V, f in = 1KHz, Vi = 100mVrms, fck = 390KHz, Ta = 25 C, unless otherwised noted ) SYMBOL PARAMETER Icco Sypply current Gv Vomax Voltage gain RL = 47K Maximum output voltage THD = 10% 30KHz L.P.F. THD Output disortion No Output noise voltage PSRR Power supply rejection ratio Tmute Mute time Min Test condition DIN Audio Typ Ω Max Unit 3 6 mA -0.5 2.5 dB 0.7 1.7 Vrms Echo mode 2 3.0 % Surround mode 2 3.0 % Echo mode -76 -60 dBV Surround mode -78 -60 dBV -40 -25 dB Vcc = -20dBV f = 100Hz Echo mode 76 84 92 msec Surround mode 76 84 92 msec DC CHARACTERISTICS Symbol Parameter Vcc Supply voltage Icc Supply current V IH "H" input voltage V IL "L" input voltage Limits Min 4.5 Page 6 Unit Typ Max 5 5.5 V 3 6 mA 3.5 V 1.5 V V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO ECHO MODE APPLICATION CIRCUIT Echo Mode 5V 22 µ + 8.2K 100K 47K 10 µ I/P 47K O/P OP2 3.3 µ 27K 8200p 27K 0.01µ 33K 16 5V 3900p 30K 0.01µ 560p 15 14 6800p 27K 33K 22K 12K + 22µ 4.7K 470p 13 12 11 10 19 16 17 18 3300p 2200p OP1 10K 50K SM7181 11 12 13 10K 220 µ 14 18K 15 0.1µ 0.1µ 0.1µ 200p 100 µ +5V 1 Represent Analog Ground. 2. Represent Digital Ground. Page 7 V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO MIC PRE-AMP CIRCUIT MIC 1 +5V 0.02 µ F 1µ F 1K 20K 560 47K 15K 5 + 7 10µ F 6 - 22 µF 4.7K 47K OUTPUT MIC 2 0.02 µ F 100pF ~ 820pF 47K 15K 1K 20K 560 1µ F +5V 22 µ F + 2 - 1 10µ F 4 47K 100pF ~ 820pF 4.7K 4.7K 3 4.7K 100 µF Page 8 V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO SURROUND MODE APPLICATION CIRCUIT OP1 5V 22K 12K 10µ I/P 47K 27K 0.01µ 8200p 27K 33K 3900p 6800p 3300p 2200p 30K 15 14 22 µ O/P 10K 47K 33K 0.01µ 560p 16 27K + 470p 13 12 11 10 9 6 7 8 SM7181 1 2 3 10K 220 µ 4 18K 5 0.1µ 0.1µ 0.1µ 200p 100 µ +5V 1 Represent Analog Ground. 2. Represent Digital Ground. Page 9 V1.20 SM7181 SAMHOP Microelectronics Corp. ECHO SM7181 Pad Coordinates in Microns AGND AVDD DGND DVDD DEL1 DEL2 TIN2 TEST TIN1 OSC2 ADCTL OSC1 DACTL (PIN1) VREF Y OP2-OUT OP2-IN DAC-OUT DAC-IN ADC-IN ADC-OUT OP1-IN OP1-OUT X VREF OSC1 OSC2 TIN1 TEST TIN2 DEL2 DEL1 DVDD AVDD DGND AGND ADCTL DACTL OP2-OUT OP2-IN DAC-OUT DAC-IN ADC-IN ADC-OUT OP1-OUT OP1-IN 1640.50, 1640.50, 1640.50, 1640.50, 1415.00, 1163.00, 911.00, 659.00, 468.50, 350.00, 231.50, 98.00, 98.00, 98.00, 98.00, 169.75, 430.75, 692.75, 953.75, 1215.75, 1476.75, 1668.25, 421.95 648.70 856.45 973.00 1129.80 1129.80 1129.80 1129.80 1096.80 1096.80 1096.80 1096.80 827.05 565.05 304.05 98.00 98.00 98.00 98.00 98.00 98.00 169.75 DIE SPECIFICATIONS: DIE SIZE: 1770 microns x 1230 microns BOND PAD SIZE: 4 mil x 4 mil Note: TIN1, TEST, TIN2, DEL2, DEL1 are testing PAD. Page 10 V1.20