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WM8772 Fiches technique(PDF) 50 Page - Wolfson Microelectronics plc |
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WM8772 Fiches technique(HTML) 50 Page - Wolfson Microelectronics plc |
50 / 73 page WM8772EFT – 32 LEAD TQFP Production Data w PD Rev 4.2 October 2005 50 Figure 43 Application and Release of Soft Mute The MUTE pin is an input to select mute or not mute. MUTE is active high; taking the pin high causes the filters to soft mute, ramping down the audio signal over a few milliseconds. Taking MUTE low again allows data into the filter. The automute function detects a series of ZERO value audio samples of 1024 samples long being applied to both channels. After such an event, a latch is set whose output (AUTOMUTED) is wire OR’ed through a 10kΩ resistor to the MUTE pin. Thus if the MUTE pin is not being driven, the automute function will assert mute. If MUTE is tied low, AUTOMUTED is overridden and will not mute unless the IZD register bit is set. If MUTE is driven from a bi-directional source, then both MUTE and automute functions are available. If MUTE is not driven, AUTOMUTED appears as a weak output (10kΩ source impedance) and can be used to drive external mute circuits. AUTOMUTED will be removed as soon as any channel receives a non-ZERO input. A diagram showing how the various Mute modes interact is shown below Figure 20. IZD (Register Bit) AUTOMUTED (Internal Signal) 10k Ω Ω Ω Ω MUTE (Register Bit) SOFTMUTE (Internal Signal) MUTE PIN Figure 44 Selection Logic for MUTE Modes -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 0 0.001 0.002 0.003 0.004 0.005 0.006 Time(s) |
Numéro de pièce similaire - WM8772_05 |
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Description similaire - WM8772_05 |
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