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PCM5142 Datasheet(PDF) 62 Page - Texas Instruments

Part # PCM5142
Description  PCM514x 2-VRMS DirectPath™, 112/106-dB Audio Stereo DAC With 32-bit, 384-kHz PCM Interface
PDF  123 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCM5142 Datasheet(HTML) 62 Page - Texas Instruments

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3.3V
XSMT
I2S Clocks
SCK, BCK, LRCK
3 ms
VDD
0V
High
Low
High
Low
Time
3.3V
XSMT
I
2
S Clocks
SCK, BCK, LRCK
150t + 0.2ms
S
VDD
0V
High
Low
High
Low
Time
PCM5141, PCM5142
SLAS759B – AUGUST 2012 – REVISED JANUARY 2016
www.ti.com
Recommended Powerdown Sequence (continued)
10.2.3 Planned Shutdown
These auto-muting processes can be manipulated by system designs to mute before power loss in the following
ways:
1. Assert XSMT low 150 tS + 0.2 ms before power is removed.
Figure 80. Assert XSMT
2. Stop I2S clocks (SCK, BCK, LRCK) 3 ms before powerdown as shown in Figure 81.
Figure 81. Stop I2C Clocks
10.2.4 Unplanned Shutdown
Many systems use a low-noise regulator to provide an AVDD 3.3-V supply for the DAC. The XSMT Pin can take
advantage of such a feature to measure the pre-regulated output from the system SMPS to mute the output
before the entire SMPS discharges. Figure 82 shows how to configure such a system to use the XSMT pin. The
XSMT pin can also be used in parallel with a GPIO pin from the system microcontroller/DSP or power supply.
62
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Product Folder Links: PCM5141 PCM5142



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