DS4201

3 of 24

102099

SIGNAL NAME

TYPE

FUNCTION

RAUX

I

Auxiliary right channel analog input to the analog output mixer.

LAUX

I

Auxiliary left channel analog input to the analog output mixer.

ROUT

O

LOUT

O

VCM

O

DC bias point to which all AC coupled inputs are centered.

VREFI

I

Filter capacitor connection for internal voltage reference node.

for best operation.

VA

I

Power supply input for analog functions. Range: 3.0 – 5.5V.

VD

I

Power supply input for digital functions. Range: 3.0 – 5.5V.

VB

I

USB I/F power supply input. Range: 3.0 – 3.6V.

DGND

I

Digital ground.

AGND

I

Analog ground.

X1I

I

Crystal 1 input. Use a 12.0 MHz, fundamental mode, parallel

resonant crystal. A 12.0 MHz CMOS clock source may also be used.

X10

O

Crystal 1 output. Connect to other side of crystal 1 if used.

X2I

I

Crystal 2 input. Use a 12.888 MHz, fundamental mode, parallel

resonant crystal. A 12.288 MHz CMOS clock source may also be

used.

X2O

O

Crystal 2 output. Connect to other side of crystal 2 if used.

NC

No connect. Leave these pins unconnected.

DS4201 OPERATION

Operation of the DS4201 is described per the block diagram of Figure 2 and is divided into six sections:

• USB DEVICE

• USB TRANSCEIVER

• VOLTAGE REFERENCE

• ANALOG I/O

• POWER CONTROL

The following sections provide details regarding the operation of each of these elements. Additionally,

APPENDIX C provides recommended connection information.