CS4328 datasheet(7/31 Pages) CIRRUS

7 / 31 page

latch data. Table 2 lists the four formats, along

with the associated figure number. Format 0 is

compatible with existing 16-bit D/A converters

and digital filters. Format 1 is an 18-bit version

of format 0. Format 2 is similar to Crystal ADCs

and many DSP serial ports. Format 3 is compat-

ible with the I

2S serial data protocol. Formats 2

and 3 support 18-bit input or 16-bit followed by

two zeros. In all four serial input modes, the se-

rial data is MSB-first and 2’s-complement

format.

Formats 0, 2 and 3 will operate with 16-bit data

and 16 BICK pulses as well. See Figure 6 for

1 6 - bit

timing.

However,

th e

use

BICK = 64

× IWR is recommended to minimize

the possibility of performance degradation result-

ing from BICK coupling into VREF-.

Reset and Offset Calibration

RST is an active low signal that resets the digital

filter and the delta-sigma modulator, synchro-

nizes LRCK with internal control signals and

starts an offset calibration cycle upon exiting re-

set. When RST goes low, CALO goes high and

stays high until the end of an offset calibration

cycle. An offset calibration cycle takes 1024

IWR cycles to complete. CALO must be con-

nected to CALI and CMPO must be connected

to CMPI for offset calibration. During an offset

calibration the analog output is forced to zero.

Power-Up Considerations

Upon initial application of power to the DAC,

offset calibration and digital filter registers will

be indeterminate. RST should be low during

power-up to activate an internal mute and pre-

vent this erroneous information from being

output from the DAC. Bringing RST high will

begin a calibration cycle and initialize these reg-

isters.

Muting

There are two types of mutes that can be imple-

mented with the CS4328. The first is a -50 dB

DIF1

DIF0

Mode

Figure

Table 2. Digital Input Formats

XTI/XTO

Reset Status

40 ns

minimum

40 ns

minimum

Exit Reset

LRCK

"Kickstart"

ACK0

RST

Figure 2. RESET Cancellation Timing

CS4328

DS62F3

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