3 Analog Mixing

When mixing of analog audio signal is desired, this device provides capability of mixing from various input channels with programmable mixer feature and scale factor to generate the final output channels. In this example, an input from single ended IN1P and IN1M with different tone and input swing are mixed as shown in the register setting and the input waveforms. IN1P is a 1 KHz tone at -10 dBrG and IN1M is a 750 Hz tone at -20 dBrG; 0 dBrG = 5 Vrms Full-scale.

Figure 3-1 Analog Single Ended Mix Register Setting

Figure 3-2 IN1P and IN1M Input Signal

The corresponding mixed output frequency respond is shown in Figure 3-3.

Figure 3-3 Mixed Analog Input of IN1P and IN1M