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CS4297A-KQ Datasheet(PDF) 11 Page - Cirrus Logic |
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CS4297A-KQ Datasheet(HTML) 11 Page - Cirrus Logic |
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11 / 52 page  CS4297A 11 data in its Slot 2. Write operations are similar, with the register index in Slot 1 and the write data in Slot 2 of a SDATA_OUT frame. The function of each input and output frame is detailed in Section 3, AC Link Frame Definition. Individual register de- scriptions are found in Section 4, Register Inter- face. 2.3 Output Mixer The CS4297A has two output mixers, illustrated in Figure 8. The stereo output mixer sums together the analog inputs to the CS4297A, including the PC_BEEP and PHONE signals, according to the settings in the volume control registers. The stereo output mix is sent to the LINE_OUT and ALT_LINE_OUT pins on the CS4297A. The mono output mixer generates a monophonic sum of the left and right channels from the stereo input mixer. The mono output mix is sent to the MONO_OUT output pin on the CS4297A. 2.4 Input Mux The input multiplexer controls which analog input is sent to the ADCs. The output of the input mux is converted to stereo 18-bit digital PCM data and sent to the controller by means of the AC-link SDATA_IN signal. 2.5 Volume Control The CS4297A volume registers control analog in- put levels to the input mixer and analog output lev- els, including the master volume level, and the alternate volume level. The PC_BEEP volume con- trol uses 3 dB steps with a range of 0 dB to -45 dB attenuation. All other analog volume controls use 1.5 dB steps. The analog inputs have a mixing range of +12 dB signal gain to -34.5 dB signal at- tenuation. The analog output volume controls have from 0 dB to -94.5 dB attenuation for LINE_OUT and from 0 dB to -46.5 dB attenuation for ALT_LINE_OUT and MONO_OUT. |
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