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TS4974 Datasheet(PDF) 3 Page - STMicroelectronics |
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TS4974 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 8 page Application Information TS4974 3/8 1 Application Information Operation Mode The TS4974 is a fully differential power amplifier which enables better performances in terms of noise immunity and PSRR. The TS4974 features a digital volume control with an internal gain range from -33dB up to +12dB, by steps of 3dB. When the device is firstly biased, an initial gain of -12dB is internally fixed. When standby mode is activated, the gain value is memorized and held until standby is released. The volume is controlled by means of two pins UP and DOWN on which the application of a VIL voltage will activate the increase or decrease in gain. The TS4974 integrates a debouncing system which does not allow to take into account UP or DOWN pulse shorter than Tdebounce time. Moreover an autorepeat function is implemented. When a continuous voltage is applied on UP or DOWN pin, the gain is continuously increased or decreased after a certain time called Tautorepeat. The first period of each autorepeat sequence is longer ( x1.5Tauto ) to avoid any parasitic activation. In this operational mode, Trange time is necessary to cover the whole gain range of the device. Figure 1: Typical application schematics BIAS DIGITAL VOLUME CONTROL GND VCC UP DOWN 8 Ω TS4974 Cb 1µF + 330nF + + 330nF OUT1 STBY STDBY BYPASS OUT2 DIFFERENTIAL INPUT STAGE Vin+ Vin- Cs + 1µF BIAS DIGITAL VOLUME CONTROL DIGITAL VOLUME CONTROL GND VCC UP DOWN 8 Ω TS4974 Cb 1µF + 330nF + + 330nF OUT1 STBY STDBY BYPASS OUT2 DIFFERENTIAL INPUT STAGE Vin+ Vin- Cs + 1µF Cs + 1µF |
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