Datasheet
PCM3168A
PCM3168A-Q1
www.ti.com
......................................................................................................................................................................................... SBAS452 – SEPTEMBER 2008
ZREV DAC Zero flag polarity select
This bit controls the polarity of the zero flag pin.
Default value: 0.
ZREV DAC Zero flag polarity select
0 High for zero detect (default)
1 Low for zero detect
DEC HEX B7 B6 B5 B4 B3 B2 B1 B0
71 47 ATDA07 ATDA06 ATDA05 ATDA04 ATDA03 ATDA02 ATDA01 ATDA00
72 48 ATDA17 ATDA16 ATDA15 ATDA14 ATDA13 ATDA12 ATDA11 ATDA10
73 49 ATDA27 ATDA26 ATDA25 ATDA24 ATDA23 ATDA22 ATDA21 ATDA20
74 4A ATDA37 ATDA36 ATDA35 ATDA34 ATDA33 ATDA32 ATDA31 ATDA30
75 4B ATDA47 ATDA46 ATDA45 ATDA44 ATDA43 ATDA42 ATDA41 ATDA40
76 4C ATDA57 ATDA56 ATDA55 ATDA54 ATDA53 ATDA52 ATDA51 ATDA50
77 4D ATDA67 ATDA66 ATDA65 ATDA64 ATDA63 ATDA62 ATDA61 ATDA60
78 4E ATDA77 ATDA76 ATDA75 ATDA74 ATDA73 ATDA72 ATDA71 ATDA70
79 4F ATDA87 ATDA86 ATDA85 ATDA84 ATDA83 ATDA82 ATDA81 ATDA80
ATDAx[7:0] DAC Digital attenuation level setting
Where x = 0 and 1 to 8, corresponding to the DAC channel, DACx (x = 1 to 8).
Each DAC channel (VOUTx) has a digital attenuator function. The attenuation level can be set
from 0 dB to – 100 dB in 0.5-dB steps, and also can be set to infinite attenuation (mute). The
attenuation level change from current value to target value is performed by incrementing or
decrementing with s-curve responses and a time set by ATSPDA. While an attenuation level
change sequence is in progress, new processing of the attenuation level change for new
commands are ignored; any new commands are overwritten into the command buffer. The last
command for the attenuation level change is performed after the present attenuation level
change sequence is finished.
The attenuation level for each channel can be set individually using the following formula; the
table below shows attenuation levels for various settings.
Attenuation level (dB) = 0.5 × (ATDAx[7:0]DEC – 255), where ATDAx[7:0]DEC = 0 through 255
for ATDAx[7:0]DEC = 0 through 54, attenuation is set to infinite attenuation (Mute).
ATDA0[7:0] are used to control all channels at the same time with attenuation data of ATDA0[7:0]
+ ATDAx[7:0] in decibel number, when ATMDDA is set to '1'. This scheme provides preset and
master volume operation.
Default value: 1111 1111.
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