CS4235 Datasheet, PDF (83/94 Pages) Cirrus Logic – CrystalClear Low Cost ISA Audio System

CS4235
CrystalClear ^TM Low Cost ISA Audio System
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.
REFFLT - Reference Filter, Input
Voltage reference used internal to the part. A 0.1 µF and a 1 µF capacitor with short fat traces
must be connected between this pin and AGND. No other connections should be made to this
pin.
Analog Outputs
LOUT - Left Line Level Output
Analog output from the mixer for the left channel. Nominally 1 V_RMS max centered around
VREF. A 1000 pF NPO capacitor must be attached from this pin to AGND.
ROUT - Right Line Level Output
Analog output from the mixer for the Right channel. Nominally 1 V_RMS max centered around
VREF. A 1000 pF NPO capacitor must be attached from this pin to AGND.
FLT3D - 3D Filter
A 0.01 µF capacitor must be attached from this pin to AGND.
FLTO - Filter Output
A 1000 pF NPO capacitor must be attached between this pin and FLTI.
DS252PP2
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