PCM5142 datasheet(20/123 Pages) TI2

20 / 123 page

PCM5141, PCM5142

SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

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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.

Table 5. Zero Data Detection Mode

ATMUTECTL

VALUE

FUNCTION

Independently L-ch or R-ch are zero data for zero data

detection

Bit : 2

Both L-ch and R-ch have to be zero data for zero data

1 (Default)

detection

Zero detection and analog mute are disabled for R-ch

Bit : 1

1 (Default)

Zero detection analog mute are enabled for R-ch

Zero detection analog mute are disabled for L-ch

Bit : 0

1 (Default)

Zero detection analog mute are enabled for L-ch

Table 6. Zero Data Detection Time

ATMUTETIML /

NUMBER OF LRCKs

TIME AT 48 kHz

ATMUTETIMR

0 0 0

1024

21 ms

0 0 1

5120

106 ms

0 1 0

10240

213 ms

0 1 1

25600

533 ms

1 0 0

51200

1.066 sec

1 0 1

102400

2.133 sec

1 1 0

256000

5.333 sec

1 1 1

512000

10.66 sec

8.3.3 XSMT Pin (Soft Mute / Soft Un-Mute)

An external digital host controls the PCM514x soft mute function by driving the XSMT pin with a specific

minimum rise time (tr) and fall time (tf) for soft mute and soft un-mute. The PCM514x requires tr and tf times of

less than 20 ns. 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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