CS43199 datasheet(49/111 Pages) CIRRUS

49 / 111 page

DS1113F1

CS4399

5.4 Alert Mixing Shutdown

2. Power up and verify communication with CS4399. If there is no communication, it is possible that the crystal did

not start. Check power rails and load capacitance and try again.

3. Clear PDN_CLKOUT in the Power Down Control (0x20000) register. This sets the clock output at MCLK_INT/2

frequency from CLKOUT pin.

4. Measure the frequency and verify that it is within acceptable range of the desired frequency. If yes, continue

normal operation. If not, power down the chip, change the load capacitor values and go back to step 2.

Note: These steps need to be performed only once per PCB.

5.4 Alert Mixing Shutdown

To prevent a DSD mute pattern from turning off the DAC while mixing DSD data with PCM data, turn off the auto mute by

clearing the DSD_AMUTE bit.

5.5 Enable/Disable Nonoversampling Filter

If the user decides to use the nonoversampling filter, the following sequences must be followed to enable/disable the

nonoversampling filter.

5.5.1

Nonoversampling Filter Enable Sequence

5.5.2

Nonoversampling Filter Disable Sequence

5.6 CS4399 Analog Output and Filtering

The CS4399 requires an external opamp filter stage for driving headphone loads. One of the typical filter topologies used

for this purpose is the multiple-feedback filter configuration. The CS4399 does not include phase or amplitude

compensation for an external filter. Therefore, the DAC system and phase response is dependent on the external circuitry.

5.7 Audio Output Power Down Sequences

Examples of power down sequences for PCM and DSD are shown in Ex. 5-1 and Ex. 5-2, respectively. Follow the stated

sequence every time to shut down the audio output. The sequence assumes that the PDN_DONE_INT interrupt bit is

unmasked.

TASK

VALUE

DESCRIPTION

Configure PCM filter

0x10010

0x99

0xC0001

0x0C

PCM Filter Option 0x90000

0x22

FILTER_SLOW_FASTB

PHCOMP_LOWLATB

NOS

Reserved

HIGH_PASS

DEEMP_ON

000

Nonoversampling filter is selected

High-pass filter is selected

0x10010

0x0

TASK

VALUE

DESCRIPTION

Configure PCM filter

0x10010

0x99

0xC0001

0x0D

PCM Filter Option 0x90000

0x02

FILTER_SLOW_FASTB

PHCOMP_LOWLATB

NOS

Reserved

HIGH_PASS

DEEMP_ON

000

High-pass filter is selected

0x10010

0x0

CS43199 데이터시트(PDF) 49 Page - Cirrus Logic

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