SAMHOP Microelectronics Corp.
6 CHANNELS VOLUME CONTROLLER
SM7347
GENERAL DESCRIPTION
The SM7347 is 6 channels electronic volume
controlled by 3-wire serial data. The IC is suitable
for use in DVD systems and AV.
FEATURES
* 4 Output ports
* Built-in microcomputer interface circuit con-
trolled by 16-bit serial data.
* Electronic volume
Volume level......0dB~-79dB, -
∞
dB(1dB/
step)
APPLICATIONS
* DVD
* Home Audio equipment
* AV
PIN ASSIGNMENTS
OUT4
OUT3
OUT2
OUT1
AVDD
SWin
GNDS
SRin
SLin
GNDC
Cin
GNDR1
GNDR2
GNDL1
GNDL2
Rin
GNDLR
Lin
NC
NC
NC
1
2
3
4
5
6
7
8
9
1
0
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
DVDD
CLK
DATA
LATCH
DGND
AGND
SWout
SRout
SLout
Cout
Rout
Lout
AVSS1
AVSS2
NC
NC
NC
NC
NC
NC
NC
SDIP 42PIN
Page 1
MAY.2003
SAMHOP Microelectronics Corp.
6 CHANNELS VOLUME CONTROLLER
SM7347
BLOCK DIAGRAM
C input
SW input
SL input
SR input
L input
R input
volume
C output
SW output
SL output
SR output
L output
R output
μ
-com
interface
Latch Data CLK
Page 2
MAY.2003
SAMHOP Microelectronics Corp.
6 CHANNELS VOLUME CONTROLLER
SM7347
PIN DESCRIPTION (Pin count base on 42pin SDIP)
Pin No.
1
2
3
4
5
7
10
12
13
14
15
17
6
8
9
11
16
18
36
35
34
33
32
31
29
30
37
38
39
40
41
42
Symbol
OUT4
OUT3
OUT2
OUT1
AVDD
GNDS
GNDC
GNDR1
GNDR2
GNDL1
GNDL2
GNDLR
SW in
SR in
SL in
C in
R in
L in
SW out
SR out
SL out
C out
R out
L out
AVSS2
AVSS1
AGND
DGND
LATCH
DATA
CLK
DVDD
Analog negative Power supply
Analog GND
Digital GND
Latch INPUT
Data INPUT
Clock INPUT Fowrward data
Digital Power supply
39,40,41
S
INPUT:schmitt trigger type
+5V
-7V
Volume OUTPUT
Volume INPUT
6,8,9,11,16,18
18 to 22 K
Ω
(TYP)
Function
OUTPUT: PMOS
Transistor
open drain
Circuit
DVDD(=5V)
1 to 4
Port OUTPUT
Analog positive Power supply
+7V
GND
Connect to analog GND
31~36
Page 3
MAY.2003
SAMHOP Microelectronics Corp.
6 CHANNELS VOLUME CONTROLLER
SM7347
PIN CONFIGURATION AND IC INTERNAL BLOCK DIAGRAM
OUT4
OUT3
OUT2
OUT1
SWin
volume
OUT-
PUT
PORT
volume
DVDD
CLK
DATA
I/F
LATCH
DGND
MCU
SW out
SRin
SLin
volume
SRout
SLout
Cout
Cin
volume
Rout
Lout
volume
Rin
volume
LIN
Page 4
MAY.2003
SAMHOP Microelectronics Corp.
6 CHANNELS VOLUME CONTROLLER
SM7347
ABSOLUTE MAXIMUM RATINGS
Symbol
Vsupply
Pd
K
θ
Topr
Tstg
Parameter
Supply Voltage
Power dissipation
Thermal derating
Operating temperature
Storage temperature
Conditions
AVDD-AVSS
Ta<25
o
C
Ta>25
o
C
*standard board
Ratings
16.0
1000
10
-20~+75
-40~+125
Unit
V
mW
mW /
o
C
o
C
o
C
THERMAL DERATING (MAXIMUM RATING)
Standard board
1.5
POWER DISSIPATION pd[W]
1.0
0.5
0
25
50
75
100
125
150
AMBIENT TEMPERATURE Ta [
℃
]
Page 5
MAY.2003
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