Datasheet

DATA
LRCK
1t
S
L- channel R- channel
MSB LSB MSB LSB
DATA
MSB LSB MSB LSB
Audio data word = 16-bit, BCK = 32, 48, 64f
S
DATA
MSB LSB MSB LSB
BCK
161521 161521
2423
2 242321
323121 323121
1
Audio data word = 24-bit, BCK = 48, 64f
S
Audio data word = 32-bit, BCK = 64f
S
PCM5100A , PCM5101A , PCM5102A
PCM5100A-Q1 , PCM5101A-Q1 , PCM5102A-Q1
SLAS859C –MAY 2012–REVISED MAY 2015 www.ti.com
I
2
S Data Format; L-channel = LOW, R-channel = HIGH
Figure 14. I
2
S Audio Data Format
9.3.2.3 Zero Data Detect
The PCM510xA has a zero-data detect function. When the device detects continuous zero data, it enters a full
analog mute condition. The PCM510xA counts zero data over 1024 LRCKs (21ms @ 48kHz) before setting
analog mute.
In Hardware mode, the device uses default values. By default, Both L-ch and R-ch have to be zero data for zero
data detection to begin the muting process etc.
9.3.3 XSMT Pin (Soft Mute / Soft Un-Mute)
An external digital host controls the PCM510xA soft mute function by driving the XSMT pin with a specific
minimum rise time (t
r
) and fall time (t
f
) for soft mute and soft un-mute. The PCM510xA requires t
r
and t
f
times of
less than 20ns. In the majority of applications, this is no problem, however, traces with high capacitance may
have issues.
When the XSMT pin is shifted from high to low (3.3 V to 0 V), a soft digital attenuation ramp begins. –1-dB
attenuation is then applied every sample time from 0 dBFS to –∞. The soft attenuation ramp takes 104 samples.
When the XSMT pin is shifted from low to high (0 V to 3.3 V), a soft digital “un-mute” is started. 1-dB gain steps
are applied every sample time from –∞ to 0 dBFS. The un-mute takes 104 samples.
In systems where XSMT is not required, it can be directly connected to AVDD.
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