Datasheet

PCM51xx
Audio DAC
Linear
Regulator
3V3
10 F
GND
GND
SMPS
6V
GND
XSMT
110V / 220V
MCU GPIO
“mute” signal
3.3V
XSMT
I2S Clocks
SCK, BCK, LRCK
3msec
VDD
0V
High
Low
High
Low
Time
PCM5100, PCM5101, PCM5102
www.ti.com SLAS764B –MAY 2011–REVISED SEPTEMBER 2012
2. Stop I
2
S clocks (SCK, BCK, LRCK) 3ms before powerdown as shown below:
Unplanned Shutdown
Many systems use a low-noise regulator to provide an AVDD 3.3V 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 DAC before
the entire SMPS discharges. Figure 37 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.
Figure 37. Using the XSMT Pin
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Product Folder Links: PCM5100 PCM5101 PCM5102