CS4239 datasheet(85/98 Pages) CIRRUS

85 / 98 page

RAUX2 - Right Auxiliary #2 Input

Nominally 1 VRMS 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 VRMS 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 VRMS 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 VRMS max centered around

VREF. This pin needs a 1000 pF NPO capacitor attached and tied to analog ground.

FLT3D - 3D Filter

This pin needs a 0.01

µF capacitor attached and tied to analog ground.

FLTO - Filter Output

This pin needs a 1000 pF NPO capacitor attached and tied to FLTI.

FLTI - Filter Input

This pin needs a 1000 pF NPO capacitor attached and tied to FLTO.

VREF - Voltage Reference, Output

All analog inputs and outputs are centered around VREF which is nominally 2.1 Volts. This pin

may be used to level shift external circuitry, although any AC loads should be buffered.

CS4239

CrystalClear Portable ISA Audio System

DS253PP2

CS4239 Datasheet(PDF) 85 Page - Cirrus Logic