CS4231A Datasheet, PDF (51/76 Pages) List of Unclassifed Manufacturers – PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC

CS4231A
LAUX2 - Left Auxiliary #2 Input, Pin 38 (L), Pin 44 (Q).
Nominally 1 V_RMS max analog input for the Left AUX2 channel, centered around VREF. A
programmable gain block (I4) allows routing of the AUX2 channels into the output mixer.
RAUX2 - Right Auxiliary #2 Input, Pin 43 (L), Pin 49 (Q).
Nominally 1 V_RMS max analog input for the Right AUX2 channel, centered around VREF. A
programmable gain block (I5) allows routing of the AUX2 channels into the output mixer.
MIN - Mono Input, Pin 46 (L), Pin 56 (Q).
Nominally 1 V_RMS max analog input, centered around VREF, that goes through a
programmable gain stage (I26) into both channels of the 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. On power-up, MIN is connected directly to MOUT, but not to L/ROUT. The
default condition can be changed in I26.
Analog Outputs
LOUT - Left Line Level Output, Pin 40 (L), Pin 46 (Q).
Analog output from the mixer for the left channel. Nominally 1 V_RMS max centered around
VREF when OLB = 1 (I16). When OLB = 0, the output is attenuated 3 dB and is a maximum
of 0.707 V_RMS
ROUT - Right Line Level Output, Pin 41 (L), Pin 47 (Q).
Analog output from the mixer for the right channel. Nominally 1 V_RMS max centered around
VREF when OLB = 1 (I16). When OLB = 0, the output is attenuated 3 dB and is a maximum
of 0.707 V_RMS
MOUT - Mono Output, Pin 47 (L), Pin 57 (Q).
When OLB=1 (I16), MOUT is nominally 1 V_RMS max analog output, centered around VREF.
When OLB=0, the maximum output voltage is 3 dB lower, 0.707 V_RMS. 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.
Independently mutable via MOM in I26.
Miscellaneous
XTAL1I - Crystal #1 Input, Pin 17 (L), Pin 12 (Q).
This pin will accept either a crystal with the other pin attached to XTAL1O or an external
CMOS clock. XTAL1 must have a crystal or clock source attached for proper operation. The
standard crystal frequency is 24.576 MHz although other frequencies can be used. The crystal
should be designed for fundamental mode, parallel resonance operation.
XTAL1O - Crystal #1 Output, Pin 18 (L), Pin 13 (Q).
This pin is used for a crystal placed between this pin and XTAL1I.
DS139PP2
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