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CS43199 Datasheet(PDF) 49 Page - Cirrus Logic |
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CS43199 Datasheet(HTML) 49 Page - Cirrus Logic |
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49 / 111 page  DS1113F1 49 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 REGISTER/BIT FIELDS 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 0 0 1 000 1 0 Nonoversampling filter is selected High-pass filter is selected 0x10010 0x0 TASK REGISTER/BIT FIELDS 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 0 0 0 000 1 0 High-pass filter is selected 0x10010 0x0 |
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