CS4237B Datasheet, PDF (100/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
RAUX1 - Right Auxiliary #1 Input
Nominally 1 V_RMS max analog input for the Right AUX1 channel, centered around VREF. A
programmable gain block provides volume control and is located in I3. Typically used for an
external Right line-level input.
LAUX2 - Left Auxiliary #2 Input
Nominally 1 V_RMS max analog input for the Left AUX2 channel, centered around VREF. A
programmable gain block provides volume control and is located in I4. Typically used for the
Left channel CDROM input.
RAUX2 - Right Auxiliary #2 Input
Nominally 1 V_RMS max analog input for the Right AUX2 channel, centered around VREF. A
programmable gain block provides volume control and is located in I5. Typically used for the
Right channel CDROM input.
CMAUX2 - Common Mode Auxiliary #2 Input
Common mode ground input for the LAUX2 and RAUX2 inputs. Typically connected to the
CDROM ground input to provide common-mode noise rejection. The impedance on this pin
should be one half the impedance on the LAUX2 and RAUX2 inputs.
MIN - Mono Input
Nominally 1 V_RMS max analog input, centered around VREF, that goes through a
programmable gain stage (I26) into both channels of the output mixer. This is a general purpose
mono analog input that is normally used to mix the typical "beeper" signal on most computers
into the audio system.
Analog Outputs
LOUT - Left Line Level Output
Analog output from the mixer for the left channel. Nominally 1 V_RMS max centered around
VREF. This pin needs a 1000 pF NPO capacitor attached and tied to analog ground.
ROUT - Right Line Level Output
Analog output from the mixer for the Right channel. Nominally 1 V_RMS max centered around
VREF. This pin needs a 1000 pF NPO capacitor attached and tied to analog ground.
MOUT - Mono Output
MOUT is nominally 1 V_RMS max analog output, centered around VREF. This output is a
summed analog output from both the left and right output channels of the mixer. MOUT
typically is connected to a speaker driver that drives the internal speaker in most computers. In
MODE2, MOM in I26 mutes both channels going into MOUT. In MODE 3, MOM in I26
mutes the left channel and MOMR in X5 mutes the right channel.
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