Silan
Semiconductors
SC9153A
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
1
ELECTRONIC VOLUME CONTROLLER
DESCRIPTION
The
SC9153A is CMOS IC which has been designed for
electronization volume control of audio equipment,etc.
FEATURES
*Wide operating voltage range(V
DD=
6V ~ 12V)
*Low current comsumption .
*Attenuation can be controlled from 0dB to 66dB by 2dB/step
*Both of dual power suppliers of (+) and (-) and a single power
supply can be used.
*Be capable of controlling attenuation by means of the built-in
oscillator and the up/down terminals.
DIP-16
BLOCK DIAGRAM
7
B
i
t
s
L
at
ch
C
i
r
c
ui
t
A-SW
A-SW
A-SW
A-SW
A-SW
A-SW
A-SW
6B
i
t
sL
a
t
c
h
C
i
r
c
u
i
t
A-SW
A-SW
A-SW
A-SW
A-SW
A-SW
7B
i
t
sL
a
t
c
h
C
i
r
c
u
i
t
A-SW
A-SW
A-SW
A-SW
A-SW
A-SW
A-SW
6
B
i
t
s
Lat
ch
C
i
r
c
ui
t
A-SW
A-SW
A-SW
A-SW
A-SW
A-SW
7 Bits Bidirectional
shift registor
U/D
CK
6 Bits Bidirectional
shift registor
U/D
CK
OSC
Auto Initialize
Circuit
Constant
Current
Circuit
CK
CK
CK
CK
2
3
4
5
6
15
14
13
12
11
8
7
1
16
10
9
INT
INT
VDD
VSS
INH
R-OUT1
R-IN1
DCO
A-GND
R-IN2
R-OUT2
L-OUT2
L-IN2
A-GND
L-IN1
L-OUT1
OSC
U/D
VDD
Silan
Semiconductors
SC9153A
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
2
PIN CONFIGURATION
SC9153A
15
16
13
14
11
12
9
10
2
1
4
3
6
5
8
7
Vss
L-OUT1
A-GND
INH
DCO
R-IN1
A-GND
R-IN2
R-OUT2
U/D
OSC
L-IN1
L-IN2
L-OUT2
R-OUT1
VDD
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Value
Unit
Supply Voltage(Pin 16)
V
DD
13.0
V
Input/Output Voltage
V
IN
Vss-0.3V ~ V
DD
+0.3V
V
Power Dissipation
P
D
150
mW
Operating Temperature
Topr
-30 ~ +75
C
Storage Temperature
Tstg
-55 ~ +125
C
ELECTRICAL CHARACTERISTICS
(Tamb=25
C,V
DD
=12.0V, V
SS
=0V, Unless otherwise specified)
Parameter
Symbol
Test conditions
Min
Typ
Max
Unit
Operating Supply Voltage
V
DD
6
12
V
Operating supply current
I
DD
1
3
mA
"H" Level
V
IH
0.8*V
DD
V
DD
+0.3
Input Voltage
"L" Level
V
IL
INH,U/D
Vss-0.3
0.2*V
DD
V
Backup current
I
B
VDD=4V,INH="L"
10
A
Attenuator 1 (10dB/step) resistor
R
ATT-1
R
-IN1
(
L-IN1
) ~ A-GND
25
50
70
k
Attenuator 2 (2dB/step) resistor
R
ATT-2
R
-IN2
(L
-IN2
) ~ A-GND
10
20
28
k
Attenuator Error
2
dB
Maximum Input Amplitude
Vin
Biase V
DD
/2=6V
4.0
Vrms
Total Harmonic Distortion
THD
ATT=-10dB, fin=1kHz,
Vin=1.0Vp-p
0.005
0.01
%
DCO output current
I
DCO
1 step
70
100
140
A
Oscillation frequency
f
OSC
5
10k
Hz
Silan
Semiconductors
SC9153A
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
3
FUNCTIONAL DESCRIPTION OF EACH TERMINAL
Terminal
No.
Symbol
Function
Remarks
2,15
L-OUT1,
R-OUT1
10dB/step attenuator outputs. A signal applied to IN is
attenuated in 7 steps from 0dB to 60dB at 10dB/step.
3,14
L-IN1,
R-IN1
10dB/step attenuator inputs
4,13
A-GND
Analog ground terminal
5,12
L-IN2,
R-IN2
2dB/step attenuator inputs
6,11
L-OUT2,
R-OUT2
2dB/step attenuator outputs. A signal applied to IN is
attenuated in 5 steps from 0dB to 8dB at 2dB/step.
L and R are symmetrical.
Out1
IN1
A-
GND
IN2
Out2
7
INH
Inhibit terminal. When this terminal is at "L" level, all
input/output cut off and the SC9153A is placed in the
inhibit state. When at "H" level, the SC9153A operates
normally.
8
DCO
DC current output for displaying attenuation. Attenuation
0dB~
is divided into 13 steps and approx 100
A/step is
transmitted.
~
~
13 steps
1step=100
A
0dB
Attenuation can be
converted to DC voltage
by attaching a resistor
between this terminal and
Vss.
9
OSC
R,C connecting terminal or the oscillator. Up/down speed
of attenuation is decided by the attenuation up/down
control oscillator according to this time constant.
VDD
OSC
10
U/D
Attenuation terminal for oscillator. When this terminal is
at "H" level, sound volume is increased synchronizing
with rise of the oscillator. Conversely, when this pin is at
"L" level, sound volume is decreased.
U/D
1
VSS
(-) Power supply terminal
16
VDD
(+) Power supply terminal
Silan
Semiconductors
SC9153A
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
4
DESCRIPTION OF OPERATION
1. SETTING OF ATTENUATION
On the SC9153A, attenuation can be increased/decreased according to the stae of U/D terminal "H" or "L"
level ) by actuating the build-in oscillator. The attenuation is automatically set at the -40dB positions when power is
applied.
Power
Supply
U/D
OSC
-40dB
-38dB
-34dB
-32dB
-30dB
-36dB
When the UP key is pressed after power ON,
the U/D terminal is place in the UP state at "H"
level, and the oscillator is actuated. When the
DOWN key is pressed, the U/D terminal is kept
at "L" level as long as the Down key is pressed,
and the oscillator is actuated in the down state
and therefore, attenuation is decreased.
Oscillation frequency is decided by Cx and Rx.
Fosc=1/(0.7*Rx*Cx) (Hz)
(Rs>3Rx)
VDD
OSC
U/D
2.2
F
Rx
Cx
Rs
UP
Down
Vss
Rx=33k
Cx=4.7
F
Rs=100k
9
10
16
2.ATTENUATION DISPLAY OUTPUT
The SC9153A is provided with DC current output terminal for displaying attenuation. With 0dB ~
divided in to
13steps, current of approx 100
A/step is transmitted.
Silan
Semiconductors
SC9153A
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
5
STEP
DCO
ATTENUATION
REMARKS
0
0
-64dB ~
1
I
DCO
=100
A
30
A
-60dB ~ -62dB
2
2
I
DCO
-54dB ~ -58dB
3
3
I
DCO
-50dB ~ -52dB
4
4
I
DCO
-44dB ~ -48dB
5
5
I
DCO
-40dB ~ -42dB
6
6
I
DCO
-34dB ~ -38dB
7
7
I
DCO
-30dB ~ -32dB
8
8
I
DCO
-24dB ~ -28dB
9
9
I
DCO
-20dB ~ -22dB
10
10
I
DCO
-14dB ~ -18dB
11
11
I
DCO
-10dB ~ -12dB
12
12
I
DCO
-4dB ~ -8dB
13
13
I
DCO
0dB ~ -2dB
Step 0
1
2
3
4
5
6
7
8
9
10
11
12
13
About
1.3V
1 Step is about 100mV30mV
8
1k
Vss
3.ATTENUATOR
The attenuator unit consist of diffused resistors and analog switches. Attenuator-1 attenuates 0 ~ 60dB at
10dB/step while Attenuator-2 attenuates 2~8db at 2dB/step, a total of 0~ 66dB at 2dB/step.
-10
0
-30
-20
-40
-60
-50
-2
0
-6
-4
-8
-
R1
R1
R1
R1
R1
R1
R1
R2
R2
R2
R2
R2
OUT1
IN1
IN2
Buffer
OUT2
Attenuator-2
Attenuator-1
R1=50k (typical)
R2=20k (typical)
A-GND
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