Page 1
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
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
AVDD
VREF
AGND
DGND
NC1
OSCR
SDI/PDI
DVDD
Test
EC/SR
SDReq/PD1
SDCK/PD2
SDData/PD3
Mute
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
V.2.0 MAR. 8, 2002
PIN ASSIGNMENT
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 2
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
I/O
Power
AI/O
Power
Power
OSC
IN
Power
IN
IN
IN
IN
IN
IN
AIN
AIN
AIN
AIN
AIN
AOUT
AIN
AOUT
AIN
AOUT
AOUT
AIN
AOUT
Function
Analog positive power supply
Analog reference voltage
Analog negative power supply
Digital negative power supply
No connection
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
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
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 3
BLOCK DIAGRAM
SRAM
AD Converter
DA Converter
Low Pass
Filter
Low Pass
Filter
OSC Verf POR
Digital Control
Mix
OSCR
VREF
PD3
PD2
PD1
EC/SR
TEST
SDI/PDI
AVDD
AGND
DVDD
DGND
Mute
OP1-IN
OP2-OUT
OP1-OUT
OP2-IN
ECFB
A
D
C
T
L
2
A
D
C
I
N
A
D
C
O
U
T
A
D
C
T
L
1
D
A
C
I
N
D
A
C
O
U
T
D
A
C
T
L
2
D
A
C
T
L
1
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 4
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.
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
0
5
4
3
2
1
6
SDReq
SDData
SDCK
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.
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 5
Echo Mode & 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.
Audio
out
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.
Add
Low Pass
Filter
AD Converter
DA Converter
Low Pass
Filter
SRAM
Audio In
Echo Mode
Low Pass
Filter
AD Converter
DA Converter
Low Pass
Filter
SRAM
Surround Mode
Audio In
Audio Out
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 6
DELAY TIME TABLE
Surround Mode
0
0
0
0
0
0
0
0
Delay Time
4.1ms
10.2ms
14.3ms
20.5ms
24.6ms
30.7ms
34.8ms
41.0ms
PD1
0
1
1
0
1
0
0
1
PD2
0
1
0
1
0
0
1
1
Sample Rate
750KH
Z
750KH
Z
750KH
Z
750KH
Z
750KH
Z
750KH
Z
750KH
Z
750KH
Z
NOTE: All the value are based on internal OSC is 6MHz
PD3
0
0
0
0
1
1
1
1
Echo Mode
1
1
1
1
1
1
1
1
Delay Time
20.5ms
41.0ms
61.4ms
81.9ms
98.3ms
122.9ms
139.3ms
163.8ms
PD1
0
1
1
0
1
0
0
1
PD2
0
1
0
1
0
0
1
1
Sample Rate
375KH
Z
375KH
Z
375KH
Z
375KH
Z
187.5KH
Z
187.5KH
Z
187.5KH
Z
187.5KH
Z
PD3
0
0
0
0
1
1
1
1
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 7
AC CHARACTERISTICS
( Vcc
=
5.0V, f
in
= 1KHz, Vi
=
100mVrms, f
ck
=
6MHz, Ta
=
25 C, unless
otherwise noted )
o
Symbol
Icco
Gv
Vomax
Parameter
Supply current
Voltage gain
Maximum output
voltage
Test Condition
RL = 47K
THD = 10%
THD
No
Output distortion
Output noise voltage
30KHz
L.P.F.
DIN
Audio
Echo mode
Surround mode
Echo mode
Surround mode
PSRR
Tmute
Power supply
rejection ratio
Mute time
Vcc = -20dBV
f = 100Hz
Echo mode
Surround mode
Min. Typ. Max. Unit
60 100 mA
-0.5 2.5 dB
0.7 1.2 Vrms
1.5 3.0 %
0.3 1.0 %
-85 -60 dBV
-90 -70 dBV
-40 -25 dB
515 520 525
msec
122 127 132
msec
DC CHARACTERISTICS
Vcc
Icc
V
IH
V
IL
Symbol
Parameter
Unit
Limits
Min Typ Max
Supply voltage
Supply current
"H" input voltage
"L" input voltage
V
mA
V
V
4.5 5 5.5
60 100
3V
1.5V
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 8
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
Unit
V
mA
W
Limits
6.5
100
1.7
-20 ~ 75
-25 ~ 125
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 9
Echo Mode
28 27 26 25 24 23 22 21 20 19 18 17 16 15
SM7183
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9 10 11 12 13 14
47
F
0.1
F
ECHO MODE APPLICATION CIRCUIT
47
F
0.1
F
+5V
*10K
20K
0.1
F
10K
+5V
0.01
F
75K
0.33
F
7.5K
75K
0.33
F
7.5K
0.01
F
0.047
F
0.047
F
5600pF
15K
10K
15K
560pF
0.033
F
NC
50K
15K
560pF
10K
10 F
15K
4.7K
4.7
F
100K
INPUT
5600pF
15K
4.7
F
OUTPUT
3K
10
F
1. Pin 6 R is approximate 15K~25k
.
2. Represent Analog Ground.
3. Represent Digital Ground.
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 10
MIC 1
20K
MIC 2
20K
C
0.02
F
C
0.02
F
1
F
1
F
15K
15K
47K
47K
1K
560
22
F
1K
1K
560
22
F
5
6
+
-
10
F
+12V
47K
100pF
~
820pF
47K
OUTPUT
4.7K
4.7K
10
F
100pF
~
820pF
4
3
2
1
+
-
7
4.7K
100
F
4.7K
+12V
MIC PRE-AMP CIRCUIT
V.2.0 MAR. 8, 2002
8
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 11
SURROUND MODE APPLICATION CIRCUIT
28 27 26 25 24 23 22 21 20 19 18 17 16 15
SM7183
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9 10 11 12 13 14
47
F
0.1
F
47
F
0.1
F
+5V
10K
20K
0.1
F
+5V
0.01
F
75K
0.33
F
7.5K
75K
0.33
F
7.5K
0.01
F
0.047
F
NC
NC
NC
0.047
F
5600pF
15K
10K
15K
560pF
OUTPUT
10
F
3K
15K
560pF
10K
100K
INPUT
5600pF
15K
4.7
F
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
Page 12
MUTE APPLICATION CIRCUIT
1K
+5V
2
3
-
+
10
F
+5V
IC1
8
4
1K
1K
1
2
3
-
+
+5V
8
4
1
10K
VR1
1K
+5V
+5V
+5V
7.5K
10K
VR2
2M
Q1
8550
+
-
-
+
10K
4
7
3
2
+5V
6
IC3
IC2
PIN14
MIC OUTPUT
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
V.2.0 MAR. 8, 2002
SM7183
ECHO
S
AM
H
OP
Microelectronics Corp.
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