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TDA7808 bảng dữ liệu(PDF) 17 Page - STMicroelectronics

tên linh kiện TDA7808
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TDA7808 bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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DS12230 Rev 4
17/39
TDA7808
Operation states
38
4
Operation states
TDA7808 functionality is regulated by means of a finite state machine.
Main states are:
Standby
ECO-mode
Amplifier mode
4.1
Standby state
When STBY pin is under VILSTBY voltage the amplifier is in stand-by state and the current
consumption is very low.
4.2
ECO-mode state
When STBY pin is over VIHSTBY the amplifier is in a state of low current absorption, the
ECO-mode. The short circuit protections are active and the amplifier is ready for receiving
commands from micro-controller through I2C interface.
Outputs and A3V3 supply are biased at 0 V.
4.3
Amplifier-mode state
When TDA7808 is in ECO-mode state, IB3-d0 is set to "1", (Amplifier-ON), and I2S clock is
present the amplifier moves to Amplifier-mode state.
The outputs are biased from 0 V to Vcc/2 and the current consumption reaches "Iq" level
until the amplifier is set in MUTE or in PLAY with low level signal. User can move the
amplifier from MUTE to PLAY and viceversa acting on IB2-d4, d3 bits.
A hardware unmute pin is available in PSO36 package only.



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