SM7183

三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO GENERAL DESCRIPTIONS SM7183 is an Audio Echo Processor using CMOS Technology. It has built-in AD/DA and 30KBits SRAM for time delay. Three sample rate selection and eight delay time selection. Many combination to fit your applications. FEATURES * Built-in adjustable OSC. * Built-in power on reset circuit. * Built-in 30KBits SRAM for delay control. * Adjustable delay time setting: Echo Mode: 20.5ms ~ 163.8ms Surround Mode: 4.1ms ~ 41.0ms (Based on 6MHz OSC) * Direct control & Micro-processor control interface. * Auto muting during power up and change mode. APPLICATIONS * * * * * VCD Karaok TV Audio System Car Stereo PIN ASSIGNMENT AVDD VREF AGND DGND NC1 OSCR SDI/PDI DVDD Test EC/SR SDReq/PD1 SDCK/PD2 SDData/PD3 Mute 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 OP1-IN OP1-OUT ECFB NC2 OP2-OUT OP2-IN DAC-OUT DAC-IN ADC-OUT ADC-IN ADCTL-2 ADCTL-1 DACTL-2 DACTL-1 Page 1 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO Function Analog positive power supply Analog reference voltage Analog negative power supply Digital negative power supply No connection PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin Name AVDD VREF AGND DGND NC1 OSCR SDI/PDI DVDD Test EC/SR SDReq/PD1 SDCK/PD2 SDData/PD3 Mute DACTL-1 DACTL-2 ADCTL-1 ADCTL-2 ADC-IN ADC-OUT DAC-IN DAC-OUT OP2-IN OP2-OUT NC2 ECFB OP1-OUT OP1-IN AOUT AIN AOUT Page 2 OSC IN Power IN IN IN IN IN IN AIN AIN AIN AIN AIN AOUT AIN AOUT AIN AOUT Mute control DAC control pin1 DAC control pin2 ADC control pin1 ADC control pin2 ADC OP input ADC OP output DAC OP input DAC OP output OP2 input OP2 output No connection Echo feed back pin OP1 output OP2 input V.2.0 MAR. 8, 2002 I/O Power AI/O Power Power Add resistor to modify internal OSC Micro processor Serial interface or Parallel input selection Digital positive power supply Test mode input Echo or Surround mode selection Micro processor Serial interface or Parallel input 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO BLOCK DIAGRAM ECFB D A C T L 1 D A C T L 2 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 1 A D C T L 2 OP1-IN OP2-IN Low Pass Filter Mix AD Converter AVDD AGND SRAM Low Pass Filter DVDD DGND OP1-OUT OP2-OUT DA Converter OSC Verf POR Digital Control Mute OSCR VREF SDI/PDI TEST EC/SR PD1 PD2 PD3 Page 3 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO FUNCTION DESCRIPTIONS: Internal Control Register : Serial Interface: There is one register for SM7183's mode selection, mute control and delay time setting. This 5-bits register can only be access by tie SDI/PDI pin to VDD. When SDI/PDI is tie to VDD, the SM7183's state is control by this internal 5 Bits register. These bits are Mode for select Echo/Surround, Mute, Delay 1, Delay 2, Delay 3 for control delay time. SDReq SDCK 0 1 2 3 4 5 6 SDData When SDREQ is low then SM7183 is ready for received data from SDDATA. SM7183 will latch the SDDATA using the SDCK's negative edge. BIT 0,1 are unused data. BIT 2 is Mode as EC/SR BIT 3 is Mute as MUTE BIT 4 is Delay 1 as PD1 BIT 5 is Delay 2 as PD2 BIT 6 is Delay 3 as PD3 Parallel Mode: There are corresponding pin for the 5 bits when SDI/PDI is tie to VSS, the SM7183's state is control by external pins, like MUTE, Echo/Surround, PD1, PD2, PD3. The 5-Bits register can be access by SDReq, SDCK, SDData pin follow the following timing diagram. Page 4 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO 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 When EC/SR pin is tie to VDD then SM7183 is set to Echo Mode. When EC/SR pin is tie to GND then SM7183 is set to Surround Mode. The only difference between echo mode and surround mode are there is no feed back & add path inside the SM7183. And the delay time is shorter for surround mode then echo mode. But surround mode provide higher sampling rate and better sound quality then echo mode. MUTE CONTROL After power up the SM7183 will turn off its output for 350 ms. Any change of the EC/SR, PD1~2 pin and internal register, SM7183 will mute and turn off its output for 350 ms. Page 5 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO DELAY TIME TABLE Surround Mode 0 0 0 0 0 0 0 0 PD1 0 1 1 0 1 0 0 1 PD2 0 1 0 1 0 0 1 1 PD3 0 0 0 0 1 1 1 1 Sample Rate 750KHZ 750KHZ 750KHZ 750KHZ 750KHZ 750KHZ 750KHZ 750KHZ Delay Time 4.1ms 10.2ms 14.3ms 20.5ms 24.6ms 30.7ms 34.8ms 41.0ms Echo Mode 1 1 1 1 1 1 1 1 PD1 0 1 1 0 1 0 0 1 PD2 0 1 0 1 0 0 1 1 PD3 0 0 0 0 1 1 1 1 Sample Rate 375KHZ 375KHZ 375KHZ 375KHZ 187.5KHZ 187.5KHZ 187.5KHZ 187.5KHZ Delay Time 20.5ms 41.0ms 61.4ms 81.9ms 98.3ms 122.9ms 139.3ms 163.8ms NOTE: All the value are based on internal OSC is 6MHz Page 6 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO AC CHARACTERISTICS ( Vcc = 5.0V, f in = 1KHz, Vi = 100mVrms, fck = 6MHz, Ta = 25 C, unless otherwise noted ) Symbol Icco Gv Vomax THD o Parameter Supply current Voltage gain Maximum output voltage Output distortion Test Condition Min. Typ. Max. Unit 60 100 2.5 mA dB Vrms 3.0 1.0 -60 -70 -25 % % dBV dBV dB RL = 47KΩ THD = 10% 30KHz L.P.F. Echo mode Surround mode 0.7 -0.5 1.2 1.5 0.3 -85 -90 -40 515 520 122 127 No Output noise voltage Power supply rejection ratio Mute time Echo mode DIN Audio Surround mode Vcc = -20dBV f = 100Hz Echo mode Surround mode PSRR Tmute 525 msec 132 msec DC CHARACTERISTICS Symbol Vcc Icc V IH V IL Parameter Supply voltage Supply current "H" input voltage "L" input voltage Page 7 3V 1.5V Limits Min Typ Max 4.5 5 60 5.5 100 Unit V mA V V V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO ABSOLUTE MAXIMUM RATINGS ( Ta = 25 ℃, unless otherwise noted ) Symbol Vcc Icc Pd Topr Tstg Description Supply voltage Supply current Power dissipation Operation temperature Storage temperature Limits 6.5 100 1.7 -20 ~ 75 -25 ~ 125 Unit V mA W ℃ ℃ Page 8 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO ECHO MODE APPLICATION CIRCUIT Echo Mode OUTPUT INPUT 100K 4.7K 4.7μF 10μ F 15K 15K 4.7μF 50K 10 F 5600pF 0.33μF 0.33μF 5600pF 10K 15K 0.033μ F 560pF 3K NC 0.047μF 15K 10K 15K 0.047μF 560pF 75K 7.5K 0.01μF 75K 7.5K 0.01μF 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SM7183 11 12 13 14 15 16 17 *10K 47μF 47μF 10K 18 19 10 11 12 13 14 0.1μF +5V 0.1μF 20K 0.1μF +5V 1. Pin 6 R is approximate 15K~25kΩ. 2. 3. Represent Analog Ground. Represent Digital Ground. Page 9 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO MIC PRE-AMP CIRCUIT MIC 1 C 0.02μF +12V 1μF 1K 560 15K 47K 22μF 5 6 8 + 47K 4.7K 7 10μF 20K MIC 2 C 0.02μF 20K 1μF +12V 15K 47K 1K 100pF ~ 820pF 1K 560 22μF 3 2 + 47K 1 4 10μF 4.7K OUTPUT 4.7K 100pF ~ 820pF 4.7K 100μF Page 10 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO SURROUND MODE APPLICATION CIRCUIT INPUT OUTPUT 100K 4.7μF 3K 5600pF 15K 10K 15K NC 560pF 15K 10μF 0.33μF 0.33μF 5600pF 10K NC 560pF 15K 0.047μF 0.047μF 7.5K 75K 7.5K 75K 0.01μ F 0.01μF 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SM7183 11 12 13 14 15 NC 47μF 47μF 16 10K 17 18 19 10 11 12 13 14 0.1μF +5V 0.1μF 20K 0.1μF +5V Page 11 V.2.0 MAR. 8, 2002 三合微科股份有限公司 SAMHOP Microelectronics Corp. SM7183 ECHO MUTE APPLICATION CIRCUIT 10K +5V +5V MIC OUTPUT +5V +5V 3 2 1K +5V 1K IC1 1 + 4 3 1K 8 7.5K VR2 2M +5V 2 7 6 IC3 3+ 4 8 + 1 +5V IC2 + 4 2 10K PIN14 1K VR1 10K Q1 8550 10μF VR2 1.46M 1.2M 1.0M 0.8M 0.6M 0.4M Time 11.0S 9.0S 7.6S 6.0S 4.5S 3.0S Page 12 V.2.0 MAR. 8, 2002