三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER PIN ASSIGNMENT FEATURES * 0dB to -66dB attenuation controlled by 2dB/step * 2 channels built in * High voltage CMOS technology operating voltage range: VCC=6 ~ 12V APPLICATION Vss 1 16 VDD L-OUT1 2 15 R-OUT1 L-IN1 3 14 R-IN1 A-GND 4 13 A-GND L-IN2 5 12 R-IN2 L-OUT2 6 11 R-OUT2 INH 7 10 U/D DCO 8 9 OSC Audio Equipment Volume Control. SM7153 BLOCK DIAGRAM VDD 16 U/D U/D 7 BITS 10 CK VSS 1 INT BI-DIRECTIONAL SHIFT REGISTER INH 7 U/D 6 BITS CK BI-DIRECTIONAL SHIFT REGISTER AUTO INITIALISE CIRCUIT INT OSC 9 CONSTANT CURRENT CIRCUIT OSC 8 DCO 15 R-OUT1 14 R-IN1 13 A-GND 12 R-IN2 11 R-OUT2 VDD L-IN1 3 CK CK A-SW A-SW A-SW A-SW A-SW A-SW 7bit LATCH CIRCUIT 2 7bit LATCH CIRCUIT L-OUT1 A-SW A-SW A-SW CK CK CK 6bit LATCH CIRCUIT A-SW CK 6bit LATCH CIRCUIT A-SW A-SW A-SW A-SW A-GND 4 L-IN2 5 A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-SW L-OUT2 6 Page 1 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER PIN DESCRIPTION Pin Symbol Description 2 L-OUT1 10dB/step attenuator outputs. 15 R-OUT1 A signal applied to IN is attenuated in 7 steps from 0dB to 60dB at 10dB/step. 3 14 L-IN1 R-IN1 4 13 A-GND 5 12 L-IN2 R-IN2 2 dB/step attenuator inputs 6 L-OUT2 2 dB/step attenuator inputs 11 R-OUT2 A signal applied to IN is attenuated in 5 steps from 0dB to 8dB at 2 dB/step. 7 INH Inhibit terminal. When this terminal is at ' L ' level, all input/ output cut off and the SM7153 is placed in the inhibit state. When at ' H ' level, the SM7153 operates normally. 8 DCO DC current output for displaying attenuation. 9 OSC C, R connecting terminal for the oscillator. up/down speed of attenuation is decided by the attenuation up/down control oscillator according to this time constant. 10 U/D Attenuation up/down control input terminal. When this terminal is at ' H ' level, sound volume is increased synchronising with rise of the oscillator. Conversely, when this pin is at ' L ' level, sound volume is decreased. 1 VSS Negative Power Supply 16 VDD Positive Power Supply (Substrate) 10dB/step attenuator inputs Analog ground terminal Page 2 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER FUNCTION DESCRIPTION (1) Setting Of Attenuation After power on, attenuation is automatically set at -40dB. POWER SUPPLY U/D OSC -30dB -32dB -34dB -36dB -38dB -40dB Figure 1 When the UP key is pressed after power ON, the U/D terminal is placed in the up state at ' H ' level, and the oscillator is actuated. When the DOWN key is pressed, t 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. 1 fosc≒ (Hz) (Rs≧3Rx) 0.7 Cx * Rx VDD CX RS OSC osc RX U/D UP + RX=33 KΩ - 2.2uF CX=4.7µF RS=100 KΩ DWOM VSS Figure 2 Page 3 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER (2) Attenuation Display Output The SM7153 is provided with the DC current output terminal for displaying attenuation. With 0dB ~ ∞ divided into 13 steps, current of approx. 100µA/step is transmitted. DCO 0 I = 100μA + 30μA 2xI 3xI 4xI 5xI 6xI 7xI 8xI 9xI 10 x I 11 x I 12 x I 13 x I Step 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Attenuation -64 dB ~ ∞ -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 TABLE 1 13 12 11 8 10 9 1KΩ VSS 8 7 ABOUT 1.3V 6 5 4 3 2 STEP 0 1 ABOUT 100mV + 30mV VSS Figure 3 When high precision is required, use a variable resistor as a load resistor. Page 4 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER (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 AMP IN2 OUT1 0dB IN1 0 -10 -2 -20 -4 -30 -6 R1 OUT2 R2 -40 -8 -50 00 ATTENUATOR 2 -60 ATTENUATOR 1 A-GND R1=50kΩ(Typ.) R2=20kΩ(Typ.) Figure 4 If there is the possibility for excessive voltage being to the attenuator, it is recommended to insert a protective diode as illustrated below. VDD VDD IN Vss Vss Figure 5 Page 5 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER (4) Power Supply VDD ≈ (a) Dual Power Supply U/D +VDD OSC OSC U/D Vss ≈ A-GND INH OV DCO -Vss DC VDD UP DOWN Figure 6 VDD ≈ (b) Single Power Supply U/D OSC INH DCO +VDD Vss ≈ A-GND 1/2 VDD OV(Vss) VDD Figure 7 Page 6 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER (5) Backup When Power Off When the INH terminal is set at ' L ' level, all input/output terminals are shut off and current consumption is reduced to the minimum. The back up by means of a capacitor becomes possible in this condition. An application circuit is shown in Figure 8. VDD SM7153 +B 10KΩ + - 51KΩ -Vss Figure 8 If VDD-Vss drops below 4V, the backup becomes impossible. (6) Initialisation When Power ON When VDD-VSS drops below 4V, the auto-initialising function is actuated. The initialising level is -40dB. If rise of power supply is to It is recommended to rise supply voltage and the INH terminal as illustrated below. * VDD - VSS = 4.0V VDD - VSS OR INH TERMINAL VOLTAGE T T≧1 msec Figure 9 Page 7 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER MAXIMUM RATINGS (TA=25oC) Parameter Symbol Ratings Unit Supply Voltage VDD 15 V Input Voltage VIN VSS-0.3 ~ VDD+0.3 V Power Dissipation PD 150 mW Operating Temperature Topr -20 ~ +75 ℃ Storage Temperature Tstg -40 ~ +125 ℃ ELECTRICAL CHARACTERISTICS (Unless otherwise specified, VDD=12V, VSS=0V, Ta=25oC) Parameter Supply Voltage Supply Current Stand-by Current Input Voltage Symbol Min. Typ. Max. Unit VDD 6 - 12 V IDD - 1 3 mA - - 300 µA 0.8VDD - VDD+0.3 V VSS-0.3 - VDDx0.2 25 50 70 KΩ 10 20 28 KΩ - - 2 dB - - 4.0 Vrms fck - - 100 KHz Tck 5 - - µS IB 'H' LEVEL 'L' LEVEL Attenuator 1 resistor (10dB / step) Attenuator 2 resistor (2dB / step) Attenuation Error Max input Amplitude Max clock Frequency Min clock Width VIH VIL RATT-1 Test Condition VDD=4V,INH=L INH, U/D Terminal R-IN1 -A-GND (L-IN1) R-IN2 -A-GND RATT-2 (L-IN2) Vin Biase 0V Page 8 V.1.0 三合微科股份有限公司 SM7153 SAMHOP Microelectronics Corp. ELECTRONIC VOLUME CONTROLLER APPLICATION CIRCUIT (L-ch Only) -6V Vss 4 TA75558P + 1 - 8 2 10µF 3 10µF 680KΩ 120KΩ 1µF 27pF +6V VDD 10µF 1µF 470K Ω 82K Ω 1µF INPUT 1 16 2 15 3 14 4 GND 1µF OUTPUT 5 SM7153 13 12 6 11 7 10 8 19 CX 1µF 10K RS 1N4148 RX 1N4148 UP SW Page 9 DOWN SW V.1.0