SC9153A

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 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 (Tamb=25°C,VDD=12.0V, VSS=0V, Unless otherwise specified) 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 µA 10 kΩ 50 70 kΩ 20 28 2 dB 4.0 Vrms 0.005 0.01 % 100 140 10k µA 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 100µA/step is transmitted. 0dB 1step=100µA 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 3 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=4.7µF Rs=100k Cx Rs OSC Rx U/D UP Down 2.2µF 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 100µA/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=100µA±30µA 2 × IDCO 3 × IDCO 4 × IDCO 5 × IDCO 6 × IDCO 7 × IDCO 8 × IDCO 9 × IDCO 10 × IDCO 11 × IDCO 12 × IDCO 13 × 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 100mV±30mV 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 1000µF 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 10µF SC9153A 27k VDD= +6V 1µF 470k 2700pF 0.012µF 10µF 5.6k 1µF 27pF 10µF 560k 0.01µF VSS= -6V 1 2 Input 1µF 16 15 14 13 12 11 10 SC9153A 9 0.022µF 82k 1 2 3 4 5 6 7 SC9153A 8 16 0.068µF 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 1µF 6 7 8 1.2k 2.2µF Down UP + 2.2µF + VOLUME TREBLE BASS HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 8 2.2µF _ _ 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