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Silan Semiconductors
ELECTRONIC VOLUME CONTROLLER
DESCRIPTION
The SC9153A is CMOS IC which has been designed for electronization volume control of audio equipment,etc.
SC9153A
FEATURES
*Wide operating voltage range(VDD=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
VDD VSS
16
1
INT Auto Initialize Circuit
U/D
10
U/D 7 Bits Bidirectional shift registor CK OSC
INT
U/D 6 Bits Bidirectional shift registor CK
7 INH
OSC
9
Constant Current Circuit VDD CK CK
8
DCO
L-OUT1 L-IN1
2 3
A-SW A-SW A-SW A-SW A-SW A-SW A-SW
15 R-OUT1
A-SW A-SW A-SW A-SW A-SW A-SW A-SW
14
R-IN1
7 Bits Latch Circuit
A-GND L-IN2
4
CK CK A-SW A-SW A-SW A-SW A-SW A-SW
7 Bits Latch Circuit
13 A-GND
A-SW A-SW A-SW A-SW A-SW A-SW
5
12
R-IN2
6 Bits Latch Circuit
L-OUT2
6
6 Bits Latch Circuit
11 R-OUT2
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
1
Silan Semiconductors
PIN CONFIGURATION
Vss 1 L-OUT1 2 L-IN1 3 A-GND 4 16 VDD 15 R-OUT1 14 R-IN1 13 A-GND
SC9153A
SC9153A
L-IN2 5 L-OUT2 6 INH 7 DCO 8 12 R-IN2
11 R-OUT2 10 9 U/D OSC
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage(Pin 16) Input/Output Voltage Power Dissipation Operating Temperature Storage Temperature
Symbol
VDD VIN PD Topr Tstg
Value
13.0 Vss-0.3V ~ VDD+0.3V 150 -30 ~ +75 -55 ~ +125
Unit
V V mW C C
ELECTRICAL CHARACTERISTICS
(Tamb=25C,VDD=12.0V, VSS=0V, Unless otherwise specified)
Parameter
Operating Supply Voltage Operating supply current "H" Level Input Voltage "L" Level Backup current Attenuator 1 (10dB/step) resistor Attenuator 2 (2dB/step) resistor Attenuator Error Maximum Input Amplitude Total Harmonic Distortion DCO output current Oscillation frequency
Symbol
VDD IDD VIH VIL IB RATT-1 RATT-2 Vin THD IDCO fOSC
Test conditions
Min
6 0.8*VDD Vss-0.3 25 10
Typ
Max
Unit
INH,U/D VDD=4V,INH="L" R-IN1(L-IN1) ~ A-GND R-IN2(L-IN2) ~ A-GND Biase VDD/2=6V ATT=-10dB, fin=1kHz, Vin=1.0Vp-p 1 step
12 V 1 3 mA VDD+0.3 V 0.2*VDD A 10 k 50 70 k 20 28 2 dB 4.0 Vrms 0.005 0.01 % 100 140 10k A Hz
70 5
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
2
Silan Semiconductors
FUNCTIONAL DESCRIPTION OF EACH TERMINAL
Terminal No. Symbol Function
L-OUT1, R-OUT1 L-IN1, R-IN1 A-GND L-IN2, R-IN2 L-OUT2, R-OUT2 INH 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. 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. DC current output for displaying attenuation. Attenuation 0dB~ is divided into 13 steps and approx 100A/step is transmitted.
0dB 1step=100A 13 steps
SC9153A
Remarks
L and R are symmetrical.
Out1 IN1 AGND IN2 Out2
2,15 3,14 4,13 5,12 6,11 7
8
DCO
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 16
VSS VDD
(-) Power supply terminal (+) Power supply terminal
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
DESCRIPTION OF OPERATION
1. SETTING OF ATTENUATION
SC9153A
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
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
16 9 10
Rx=33k Cx=4.7F Rs=100k
Cx
Rs
OSC
Rx
U/D
UP
Down 2.2F
Vss
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 100A/step is transmitted.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
4
Silan Semiconductors
STEP
0 1 2 3 4 5 6 7 8 9 10 11 12 13
SC9153A
REMARKS
13 12 8
1k Vss
DCO
0 IDCO=100A30A 2 x IDCO 3 x IDCO 4 x IDCO 5 x IDCO 6 x IDCO 7 x IDCO 8 x IDCO 9 x IDCO 10 x IDCO 11 x IDCO 12 x IDCO 13 x IDCO
-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
ATTENUATION
11 10 9 8 7 6 5 4 3 2 About 1.3V
Step 0
1
1 Step is about 100mV30mV
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
0
OUT1
R1
IN2
R2
0
OUT2
-10
R1 R2
-2 -4
R2
-20
R1
-30
R1 R2
-6 -8
R2
-40
R1
-50
R1
-
Attenuator-2
-60
R1 A-GND
Attenuator-1 R1=50k (typical) R2=20k (typical)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
5
Silan Semiconductors
VDD VDD
SC9153A
If there is possibility for excessive voltage being to the attenuator, it is recommended to insert a protected diode as illustrated below.
IN1
Vss Vss
4.POWER SUPPLY
DUAL POWER SUPPLY
+VDD OSC U/D VDD A-GND VSS U/D OSC
0
UP DOWN
SC9153A
INH DCO DC
-VSS
VDD
SINGLE POWER SUPPLY
+VDD OSC U/D VDD A-GND VSS U/D OSC
0
UP DOWN
SC9153A
INH DCO DC
VSS (0V)
VDD
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
6
Silan Semiconductors
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 VDD-VSS drops below 4.0V, the backup becomes impossible.
SC9153A
+B
10K
16
10K
VDD
7
51K
INH
-VSS
1000F 16V
1
VSS
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.
VDD-VSS or INH Terminal Voltage
VDD-VSS=4.0V
T>1ms
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
7
Silan Semiconductors
APPLICATION CIRCUIT (L-CH ONLY)
UTC4558
680 120k
SC9153A
10F
27k
VDD= +6V
27pF 0.012F 10F 1F 470k 2700pF 5.6k 1F
10F 560k
0.01F VSS= -6V 82k
1 2 Input
1F
16 15 14 13 12 11 10 SC9153A 9
0.022F
1 2 3 4 5 6 7 SC9153A 8
16
0.068F
1
39k
16 15 14 13 12 11 10 SC9153A 9
15 14 13 12 11 10 9
4.7k
2 3 4 5 6 7 8
3 4 5
Output
1F
6 7 8
1.2k
2.2F
Down
UP
+
2.2F
+
VOLUME
TREBLE
BASS
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
8
2.2F _
_
Silan Semiconductors
PACKAGE OUTLINE
SC9153A
UNIT:mm
2.54
DIP-16-300-2.54
6.40
1.50 19.4
7.62
15 degree
3.51
0.46
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
9
3.30
5.08
0.25

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