SDA/CDOUT/CKF0 - Serial Control Data Out / Clock Select

In I

output data from the control port interface on the CS4225.

In hardware control mode, CKF0 and CKF1 controls the clock frequency of CLKOUT.

DATAUX - Auxiliary Data Input

DATAUX is the auxiliary audio data input line, usually connected to an external digital audio

source.

LRCKAUX - Auxiliary Word Clock Input or Output

In auxiliary slave mode, LRCKAUX is a word clock (at Fs) from an external digital audio

source. LRCKAUX can be used as the clock reference for the internal PLL. In auxiliary master

mode, LRCKAUX is a word clock output (at Fs) to clock an external digital audio source.

SCLKAUX - Auxiliary Bit Clock Input or Output

In auxiliary slave mode, SCLKAUX is the serial data bit clock from an external digital audio

source, used to clock in data on DATAAUX. SCLKAUX can be used as the clock reference for

the internal PLL. In auxiliary master mode, SCLKAUX is a serial data bit clock output.

AD0/IS0, AD1/IS1 - Input Select Control Pins

In software mode, these pins are part of the chip address.

In hardware mode, IS0 and IS1 select the audio input source from between 4 pairs of signals

(AIN1, AIN2 and AIN3) and DATAUX.

H/S - Hardware or Software Control

Setting H/S high puts the CS4225 into hardware control mode, where many functions are

controlled by dedicated pins. When H/S is low, many chip functions are controlled via the

control port in SPI mode. When H/S is open circuit, then software mode I

selected for the control port. When floating H/S, a 100pF capacitor should be connected from

the H/S pin to ground, to reduce the possibility of external interference influencing the pin.

OVL - Overload Indicator

If either of the 2 16-bit audio ADCs, or the 12-bit ADC, is clipped, then this pin goes high.

Clock and Crystal Pins

XTI, XTO - Crystal connections

Input and output connections for the crystal which may be used to operate the CS4225.

Alternatively, a clock may be input into XTI.

CLKOUT - Master Clock Output

CLKOUT allows external circuits to be synchronized to the CS4225. Alternate output

frequencies are selectable by the control port or via hardware pins.

CS4225

DS86PP8

27