Datasheet SC9153A Datasheet (SILAN)

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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
*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.

6V ~ 12V)

DD=

BLOCK DIAGRAM

U/D

10

OSC

9

L-OUT1

2

L-IN1

3

A-GND

4

L-IN2

5

6

OSC

U/D

CK

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

7 Bits Bidirectional

shift registor

VDD VSS

INT

U/D

6 Bits Bidirectional

CK

VDD

CK CK

7 Bits Latch Circuit

6BitsLatchCircuit

116

shift registor

7BitsLatchCircuit

CKCK

6 Bits Latch Circuit

INT

Auto Initialize

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

A-SW

SC9153A

INH

Circuit

Constant

Current

Circuit

7

DCO

8

R-OUT1

15

R-IN1

14

A-GND

13

R-IN2

12

R-OUT2L-OUT2

11

DIP-16

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Rev: 1.0 2000.12.31

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PIN CONFIGURATION

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Vss

1

16

VDD

SC9153A

L-OUT1

L-IN1

A-GND

L-IN2

L-OUT2

INH

DCO

2

3

4

SC9153A

5

6

7

8

15

14

13

12

11

10

9

R-OUT1

R-IN1

A-GND

R-IN2

R-OUT2

U/D

OSC

ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Value Unit

Supply Voltage(Pin 16) V
Input/Output Voltage V
PowerDissipation P

DD

IN

D

Operating Temperature Topr -30 ~ +75
Storage Temperature Tstg -55 ~ +125

13.0 V

Vss-0.3V ~ VDD+0.3V V

150 mW

°C
°C

ELECTRICAL CHARACTERISTICS

(Tamb=25°C,VDD=12.0V, VSS=0V, Unless otherwise specified)

Parameter Symbol Test conditions Min Typ Max Unit

Operating Supply Voltage V
Operating supply current I

Input Voltage

“H” Level V

“L” Level V
Backup current I
Attenuator 1 (10dB/step) resistor R
Attenuator 2 (2dB/step) resistor R

DD

DD

IH

INH,U/D

IL

VDD=4V,INH=”L” 10

B
ATT-1R-IN1(L-IN1
ATT-2R-IN2(L-IN2

)~A-GND 25 50 70

)~A-GND 10 20 28

612V

13mA

0.8*V

DD

Vss-0.3 0.2*V

VDD+0.3

DD

V

µA
kΩ

kΩ
Attenuator Error 2dB
Maximum Input Amplitude Vin Biase VDD/2=6V 4.0 Vrms
Total Harmonic Distortion THD ATT=-10dB, fin=1kHz,

0.005 0.01 %

Vin=1.0Vp-p
DCO output current I
Oscillation frequency f

1 step 70 100 140

DCO
OSC

5 10k Hz

µA

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Rev: 1.0 2000.12.31

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FUNCTIONAL DESCRIPTION OF EACH TERMINAL

Terminal

No.

2,15

3,14

4,13 A-GND

5,12

6,11
7 INH Inhibit terminal. When this terminal is at “L” level, all

8 DCO DC current output for displaying attenuation. Attenuation

Symbol Function Remarks

L-OUT1,
R-OUT1
L-IN1,
R-IN1

L-IN2,
R-IN2
L-OUT2,
R-OUT2

10dB/step attenuator outputs. A signal applied to IN is
attenuated in 7 steps from 0dB to 60dB at 10dB/step.

10dB/step attenuator inputs
Analog ground terminal

2dB/step attenuator inputs
2dB/step attenuator outputs. A signal applied to IN is

attenuated in 5 steps from 0dB to 8dB at 2dB/step.

input/output cut off and the SC9153A is placed in the
inhibit state. When at “H” level, the SC9153A operates
normally.

0dB~∞ is divided into 13 steps and approx 100µA/step is
transmitted.

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0dB

1step=100µA

SC9153A

L and R are symmetrical.

Out1

IN1

A-

GND

IN2

Out2

Attenuation can be
converted to DC voltage
by attaching a resistor
between this terminal and
Vss.

13 steps

~

~

∞

9 OSC R,C connecting terminal or the oscillator. Up/down speed

10 U/D Attenuation terminal for oscillator. When this terminal is

1 VSS (-) Power supply terminal
16 VDD (+) Power supply terminal

of attenuation is decided by the attenuation up/down
control oscillator according to this time constant.

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.

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

3

VDD

OSC

U/D

Rev: 1.0 2000.12.31

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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

-30dB

-32dB

-34dB

-36dB

-38dB

-40dB

SC9153A

Vss

VDD

OSC

U/D

2.2µF

16

9

10

Rx=33kΩ
Cx=4.7µF
Rs=100kΩ

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)

Cx Rs

Rx

UP Down

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 100µA/step is transmitted.

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STEP DCO ATTENUATION REMARKS

00

I

1
2
3
4
5
6
7
8

9
10
11
12
13

DCO=100µA±30µA

2 × I

DCO

3 × I

DCO

4 × I

DCO

5 × I

DCO

6 × I

DCO

7 × I

DCO

8 × I

DCO

9 × I

DCO

10 × I

DCO

11 × I

DCO

12 × I

DCO

13 × I

DCO

-64dB ~ ∝

-60dB ~ -62dB

-54dB ~ -58dB

-50dB ~ -52dB

-44dB ~ -48dB

-40dB ~ -42dB

-34dB ~ -38dB

-30dB ~ -32dB

-24dB ~ -28dB

-20dB ~ -22dB

-14dB ~ -18dB

-10dB ~ -12dB

-4dB ~ -8dB
0dB ~ -2dB

8

Step 0

1kΩ

Vss

4

3

2

1 Step is about 100mV±30mV

1

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.

Buffer

IN1

A-GND

R1

R1

R1

R1

R1

R1

R1

0

OUT1

-10

-20

-30

-40

-50

-60

Attenuator-1

R1=50kΩ(typical)
R2=20kΩ(typical)

IN2

R2

R2

R2

R2

R2

Attenuator-2

SC9153A

11

10

9

8

7

6

5

0

OUT2

-2

-4

-6

-8

-∞

13

12

About

1.3V

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Rev: 1.0 2000.12.31

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VDD

Vss

4.POWER SUPPLY

DUAL POWER SUPPLY

VDD

A-GND

VDD

IN1

Vss

U/D OSC

SC9153A

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If there is possibility for excessive voltage being to the
attenuator, it is recommended to insert a protected diode as
illustrated below.

+VDD

UP DOWN

SC9153A

OSC

U/D

0

VSS

SINGLE POWER SUPPLY

VDD

A-GND

VSS

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

INH

VDD

U/D OSC

SC9153A

INH

VDD

DCO

DCO

DC

DC

6

UP DOWN

-VSS

+VDD

0

VSS (0V)

OSC

U/D

Rev: 1.0 2000.12.31

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5.BACKUP WHEN POWER OFF

On the SC9153A, when the INH terminal is set
at “L” level, all input/output terminal are shut off
and current consumption is reduced to the
minimum. The backup by means of a capacitor
become possible in this condition. An example
of application, when a backup capacitor is
used, is shown right.

If V

DD-VSS drops below 4.0V, the backup

becomes impossible.

6.INITIALIZATION WHEN POWER ON

The SC9153A has the auto-initializating built-in
for initialization at time of power ON. As the
initializing system through detection of supply
voltage level is adopted., if rise power supply is
too fast, the initialization may not be fully
effected.(No external initialization is
necessary. )In addition for effective initialization,
it is necessary that the INH terminal is raised
simultaneously with supply voltage. Further, the
initializating level is –40dB.
It is recommended to rise supply voltage and the
INH terminal as illustrated below. If the VDD-VSS
drops below 4.0V, the auto-initializing function is
actuated.

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+B

-VSS

V

DD-VSS

10KΩ

51KΩ

or INH

Terminal

Voltage

10KΩ

1000µF

T>1ms

SC9153A

16

VDD

7

INH

16V

1

VSS

VDD-VSS=4.0V

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APPLICATION CIRCUIT (L-CH ONLY)

680Ω

10µF

VSS= -6V

Input

1µF

1µF

1

2

3

4

5

16

15

14

13

12

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UTC4558

120kΩ

27pF

470kΩ1µF

82kΩ

1.2kΩ 0.022µF

1

2

3

4

5

2700pF

10µF

27kΩ

5.6kΩ
560kΩ

16 1

39kΩ

15

14

13

12

SC9153A

VDD= +6V

10µF

0.012µF

0.01µF

16

2

0.068µF

3

4.7kΩ

4

5

15

14

13

12

Output

1µF

6

7

11

10

6

7

SC9153A SC9153A

Down

8 9

2.2µF

8 9

UP

11

10

6

7

SC9153A

8

_

+

2.2µF

VOLUME TREBLE BASS

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

8

11

10

9

_

+

Rev: 1.0 2000.12.31

2.2µF

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PACKAGE OUTLINE

DIP-16-300-2.54 UNIT:mm

2.54

SC9153A

0.25

6.40

1.50

19.4

3.51

0.46

7.62

15 degree

5.083.30

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0 2000.12.31

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