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SM7513 数据表(PDF) 8 Page - SamHop Microelectronics Corp. |
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SM7513 数据表(HTML) 8 Page - SamHop Microelectronics Corp. |
8 / 13 page SAMHOP Microelectronics Corp. 3W STEREO AUDIO POWER AMPLIFIER WITH UP / DOWN GAIN CONTROL VOLUME CONTROL The output volume of SM7513 is respectively controlled by two input pins, UP and Down pin. The UP pin controls the volume increment, and the DOWN pin controls the volume decrement. It increases/decreases ±2dB each step. Both are all active high. The SM7513 built-in a RC oscillator and generates a based frequency for volume output register to count increasingly or decreasingly. It starts to count when the UP/DOWN pin is pressed. If the voltage on UP/DOWN pin is disappeared in specific unit period, the volume increment or decrement is not accepted, which means no action, keeps the original voltage and clears the value in count register. Therefore, there is no increment or decrement to make the volume uncertainly. After power on or shutdown, SM7513 will has -4dB±2dB initial gain. The mapping between output volume increment / decrement and active unit period is shown in Figure 2. When the UP Key keeps high for one active unit period, the output gain increases 2db after the Key is released. When the UP Key keeps low and the DOWN Key become high level for one active unit period, the output gain decreases 2db. The action of pressed the UP/DOWN Key continually is shown in Figure 3. The gain is increased/ decreased after one unit periods. If the Key is continually be pressed more than two unit periods, the gain is increased/ decreased until to maximum 20dB or -65dB. Page 7 t T UP VIN t VDD/2 Vout DOWN T t Figure 2 . How the volume change with respect to Up/Down timing cotrol UP T 2T 2T VDD/2 Vout Figure 3. Up key be pressed continually * T 300ms ± 20% = ~ t t VIN VIN V.1.0 Apr 30,2007 |
类似零件编号 - SM7513 |
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类似说明 - SM7513 |
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