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WM8777 Datasheet(PDF) 13 Page - Wolfson Microelectronics plc |
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WM8777 Datasheet(HTML) 13 Page - Wolfson Microelectronics plc |
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13 / 103 page  Pre-Production WM8777 w PP Rev 3.0 January 2005 13 ANALOGUE TONE CONTROLS Facilities are provided for implementation of analogue treble and bass tone controls on each of the Front left, right and centre channels. External R and C values are used to set the corner frequencies of these tone control functions, allowing the system builder to choose the required responses. Adjustment of the amplitude of the required tone response is made electronically by writing the required gain or attenuation value into the WM8777 over the serial control interface. Maximum boost or attenuation of tone control values of +/-10dB in 1dB steps is provided. A tone control bypass path is provided, plus input summing paths for Rear (i.e. Surround L/R), Centre and LFE channels, to allow for creation of a stereo ‘mix-down’ signal when only two speakers are supported. Each of these mix-down paths has independent gain adjust from 0dB to -6db in 1dB steps. An analogue input bypass path is also provided. This allows AIN6L and AIN6R to be output on the FRONTL and FRONTR output channels making use of the volume controls if required. In order to provide sufficient headroom for cases where significant amounts of analogue treble or bass boost have been applied, a gain attenuation control is provided in the summing stage after the tone adjust PGAs. This allows attenuation of -6dB, -12dB or -18dB to be applied. Re-adjustment of the nominal 0dB signal level may then be made in the following volume control stage as required. pad pad pad pad Bass filter Treble filter Bass Managed Signal Bass cut +/-10dB Treble boost Tone Control Bypass Main Volume Control +20dB to -100dB 0, -6, -12, -18dB Bass boost Bass management filter Bypass Aux input DAC pad XSUMOP XIN3 XIN2 XIN1 FRONTL/R Treble cut Bass Management pad RearL/R Center LFE Stereo Mix-down inputs No-Sub Option AIN6L/R 0 to -6dB Figure 1 Tone Control Configuration - Front Left/Right (single channel shown) pad pad pad pad Bass filter Treble filter Bass Managed Signal Bass cut +/-10dB Treble boost Tone Control Bypass Main Volume Control +20dB to -100dB 0, -6, -12, -18dB Bass boost Bass management filter Bypass Aux input DAC pad CNTSUMOP CIN3 CIN2 CIN1 CNTR Treble cut Bass Management pad LFE No-Sub Option 0 to -6dB To Front L/R Figure 2 Tone Control Configuration - Centre Channel |
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