Datasheet

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PCM1770 , PCM1771
SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007
Register 03
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 OVER RSV RINV AMIX DEM FMT2 FMT1 FMT0
IDX[6:0]: 000 0011b
OVER: Oversampling Control
Default value: 0
OVER = 0 128f
S
oversampling
OVER = 1 192f
S
, 256f
S
, 384f
S
oversampling
The OVER bit controls the oversampling rate of the ∆ - Σ D/A converters. When it operates at a low sampling
rate, less than 24 kHz, this function is recommended.
RINV: Polarity Control for Headphone Output, H
OUT
R
Default value: 0
RINV = 0 Not inverted
RINV = 1 Inverted output
The RINV bits allow the user to control the polarity of the headphone output, H
OUT
R. This function can be used
to connect the monaural speaker using the BTL connection method. This bit is recommended to be 0 during the
power-up/-down sequence for minimizing audible pop noise.
AMIX: Analog Mixing Control for External Analog Signal, AIN
Default value: 0
AMIX = 0 Disabled (not mixed)
AMIX = 1 Enabled (mixing to the DAC output)
The AMIX bit allows the user to mix analog input (AIN) with headphone outputs (H
OUT
L/H
OUT
R) internally.
DEM: 44.1-kHz De-Emphasis Control
Default value: 0
DEM = 0 Disabled
DEM = 1 Enabled
The DEM bit enables or disables the digital de-emphasis filter for the 44.1-kHz sampling rate.
FMT[2:0]: Audio Interface Data Format
Default value: 000
The FMT[2:0] bits select the data format for the serial audio interface. The following table shows the available
format options.
FMT[2:0] Audio Data Format Selection
000 16- to 24-bit, left-justified format (default)
001 16- to 24-bit, I
2
S format
010 24-bit right-justified data
011 20-bit right-justified data
100 16-bit right-justified data
101 16- to 24-bit, left-justified format, master mode
110 Reserved
111 Reserved
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