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SM7186
DESCRIPTIONS:
SM7186 is 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

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

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

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

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

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

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

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

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

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

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