CS43L21 datasheet(43/63 Pages) CIRRUS

43 / 63 page

DS723A1

CS43L21

Freeze Controls (FREEZE)

Default: 0

Function:

This function will freeze the previous settings of, and allow modifications to be made to all control port reg-

isters without the changes taking effect until the FREEZE is disabled. To have multiple changes in the con-

trol port registers take effect simultaneously, enable the FREEZE bit, make all register changes, then

disable the FREEZE bit.

DAC De-Emphasis Control (DEEMPH)

Default: 0

0 - No De-Emphasis

1 - De-Emphasis Enabled

Function:

Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control.

Enables the digital filter to apply the standard 15

µs/50µs digital de-emphasis filter response for a sample

rate of 44.1 kHz.

Analog Output Auto MUTE (AMUTE)

Default: 0

0 - Auto Mute Disabled

1 - Auto Mute Enabled

Function:

Enables (or disables) Automatic Mute of the analog outputs after 8192 “0” samples on each digital input

channel.

DAC Soft Ramp and Zero Cross Control (DAC_SZC[1:0])

Default = 10

00 - Immediate Change

01 - Zero Cross

10 - Soft Ramp

11 - Soft Ramp on Zero Crossings

Function:

Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control

Immediate Change

When Immediate Change is selected all volume-level changes will take effect immediately in one step.

Zero Cross

This setting dictates that signal-level changes, either by gain changes, attenuation changes or muting, will

occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a

timeout period between 1024 and 2048 sample periods (21.3 ms to 42.7 ms at 48 kHz sample rate) if the

signal does not encounter a zero crossing. The zero cross function is independently monitored and imple-

mented for each channel. Note: The LIM_SRDIS bit is ignored.

CS43L21 bảng dữ liệu(PDF) 43 Page - Cirrus Logic