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WM8980CGEFL/V Datasheet(PDF) 28 Page - Wolfson Microelectronics plc |
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WM8980CGEFL/V Datasheet(HTML) 28 Page - Wolfson Microelectronics plc |
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28 / 123 page  WM8980 Pre-Production w PP, Rev 3.8, May 2012 28 AUXILLIARY INPUTS There are two auxiliary inputs, AUXL and AUXR which can be used for a variety of purposes such as stereo line inputs or as a ‘beep’ input signal to be mixed with the outputs. The AUXL/R inputs can be used as a line input to the input BOOST stage which has gain adjust of - 12dB to +6dB in 3dB steps (plus off). See the INPUT BOOST section for further details. The AUXL/R inputs can also be mixed into the output channel mixers, with a gain of -15dB to +6dB plus off. In addition the AUXR input can be summed into the Right speaker output path (ROUT2) with a gain adjust of -15 to +6dB. This allows a ‘beep’ input to be output on the speaker outputs only without affecting the headphone or lineout signals. INPUT BOOST Each of the stereo input PGA stages is followed by an input BOOST circuit. The input BOOST circuit has 3 selectable inputs: the input microphone PGA output, the AUX amplifier output and the L2/R2 input pin (can be used as a line input, bypassing the input PGA). These three inputs can be mixed together and have individual gain boost/adjust as shown in Figure 14. Figure 14 Input Boost Stage The input PGA paths can have a +20dB boost (PGABOOSTL/R=1) , a 0dB pass through (PGABOOSTL/R=0) or be completely isolated from the input boost circuit (INPPGAMUTEL/R=1). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R47 Left Input BOOST control 8 PGABOOSTL 1 Boost enable for left channel input PGA: 0 = PGA output has +0dB gain through input BOOST stage. 1 = PGA output has +20dB gain through input BOOST stage. R48 Right Input BOOST control 8 PGABOOSTR 1 Boost enable for right channel input PGA: 0 = PGA output has +0dB gain through input BOOST stage. 1 = PGA output has +20dB gain through input BOOST stage. Table 7 Input BOOST Stage Control |
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