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WM8941 Datasheet(PDF) 22 Page - Wolfson Microelectronics plc |
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WM8941 Datasheet(HTML) 22 Page - Wolfson Microelectronics plc |
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22 / 96 page  WM8941 Pre Production w PP, Rev 3.3, December 2007 22 AUXILLIARY INPUT An auxiliary input circuit (Figure 7) is provided which consists of an amplifier which can be configured either as an inverting buffer for a single input signal or as a mixer/summer for multiple inputs with the use of external resistors. The circuit is enabled by the register bit AUXEN. Figure 7 Auxiliary Input Circuit The AUXMODE register bit controls the auxiliary input mode of operation: In buffer mode (AUXMODE=0) the switch labelled AUXSW in Figure 7 is open and the signal at the AUX pin will be buffered and inverted through the aux circuit using only the internal components. In mixer mode (AUXMODE=1) the on-chip input resistor is bypassed, this allows the user to sum in multiple inputs with the use of external resistors. When used in this mode there will be gain variations through this path from part to part due to the variation of the internal 20kΩ resistors relative to the higher tolerance external resistors. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power management 1 6 AUXEN 0 Auxiliary input buffer enable 0 = OFF 1 = ON R44 Input control 3 AUXMODE 0 0 = inverting buffer 1 = mixer (on-chip input resistor bypassed) Table 5 Auxiliary Input Buffer Control |
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Similar Description - WM8941 |
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