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LM4540 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM4540 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 16 page Pin Description (Continued) Analog I/O (Continued) Name Pin I / O Functional Description CD_R 20 I This line level input can be routed through the Input Mux and recorded by the right ADC. In addition, this analog input gets summed into the right output stream. The amount of CD_R signal mixed in the right output stream can be adjusted from +12dB to −34.5dB in 1.5dB steps as well as muted via register 12h. MIC1 21 I Either MIC1 or MIC2 can be selected via software and routed through the Input Mux for recording. The 20dB boost circuit is enabled/disabled via register 0Eh. Also, the amount of mic signal mixed in the output stream can be adjusted from +12dB to −34.5dB in 1.5dB steps as well as muted via register 0Eh. MIC2 22 I Either MIC1 or MIC2 can be selected via software and routed through the Input Mux for recording. The 20dB boost circuit is enabled/disabled via register 0Eh. Also, the amount of mic signal mixed in the output stream can be adjusted from +12dB to −34.5dB in 1.5dB steps as well as muted via register 0Eh. LINE_IN_L 23 I This line level input can be routed through the Input Mux and recorded by the left ADC. In addition, this analog input gets summed into the left output stream. The amount of LINE_IN_L signal mixed in the left output stream can be adjusted from +12dB to −34.5dB in 1.5dB steps as well as muted via register 10h. LINE_IN_R 24 I This line level input can be routed through the Input Mux and recorded by the right ADC. In addition, this analog input gets summed into the right output stream. The amount of LINE_IN_R signal mixed in the right output stream can be adjusted from +12dB to −34.5dB in 1.5dB steps as well as muted via register 10h. LINE_OUT_L 35 O This is a post-mixed output for the left audio channel. The level of this output can be adjusted from 0dB to −45dB in 1.5dB steps as well as muted via register 02h. LINE_OUT_R 36 O This is a post-mixed output for the right audio channel. The level of this output can be adjusted from 0dB to −45dB in 1.5dB steps as well as muted via register 02h. MONO_OUT 37 O This line level output can be switched between outputting the post-mixed combined left and right outputs or the mic signal. The level of this output can be adjusted from 0dB to −45dB in 1.5dB steps as well as muted via register 06h. www.national.com 8 |
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