CS4811 datasheet(19/24 Pages) CIRRUS

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CS4811

DS486PP2

Voltage Reference

CMOUT - Common Mode Output

Output: This pin provides an internally generated reference of 2.3 V to be used for biasing external

analog circuitry. The load on CMOUT must be DC only, with an impedance of not less than 50 kilohms.

CMFILT+,CMFILT- - Common Mode Filter Connections

Inputs: These pins are connections for external filter components required by the internal common mode

reference circuit. See the typical connection diagram in Figure 3. for details.

Serial Control Port

SPI

/I2C - Serial Control Port Format Select

Input: This pin configures the control port for I2C format if tied to VD or SPI format if tied to DGND.

SCL/CCLK - Serial Control Port Clock

Output: This pin clocks serial control port data into and out of SDA in I2C mode. In SPI mode, it clocks

control port data into CDIN and out of CDOUT.

AD0/CS - I2C Address Bit 0 / SPI Chip Select

Input/Output: In I2C® mode, AD0 is an input and must be tied to ground. In SPI mode, CS is an output

and is used to select the boot EEPROM.

AD1/CDIN - I2C Address Bit 1 / SPI Data Input

Input: In I2C® mode, AD1 is an input and must be tied to ground. In SPI mode, CDIN is the serial

control port data input and is clocked in on the rising edge of CCLK.

SDA/CDOUT - I2C Data / SPI Data Output

Bidirectional/Output: In I2C® mode, SDA is the bidirectional data I/O line. In SPI mode, CDOUT is the

serial control port data output and is clocked out on the falling edge of CCLK.

Clock and Crystal

XTI, XTO - Crystal Oscillator Connections (Master Clock)

Input, Output: These pins provide connections for an external parallel resonant quartz crystal.

Alternately, an external clock source may be applied to XTI. The clock frequency must be 256xFs.

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