Datasheet
3−4
Digital Audio Interface Format (Address: 0000111)
BIT D8 D7 D6 D5 D4 D3 D2 D1 D0
Function X X MS LRSWAP LRP IWL1 IWL0 FOR1 FOR0
Default 0 0 0 0 0 0 0 0 1
MS Master/slave mode 0 = Slave 1 = Master
LRSWAP DAC left/right swap 0 = Disabled 1 = Enabled
LRP DAC left/right phase 0 = Right channel on, LRCIN high
1 = Right channel on, LRCIN low
IWL[1:0] Input bit length 00 = 16 bit 01 = 20 bit 10 = 24 bit 11 = 32 bit
FOR[1:0] Data format 11 = DSP format, frame sync followed by two data words
10 = I
2
S format, MSB first, left – 1 aligned
01 = MSB first, left aligned
00 = MSB first, right aligned
X Reserved
NOTES: 1. In Master mode, the TLV320AIC23 supplies the BCLK and LRCIN. In Slave mode, BCLK and LRCIN are supplied to the
TLV320AIC23.
2. In normal mode, BCLK = MCLK/4 for all sample rates except for 88.2 kHz and 96 kHz. For 88.2 kHz and 96 kHz sample rate,
BCLK = MCLK.
3. In USB mode, bit BCLK = MCLK
Sample Rate Control (Address: 0001000)
BIT D8 D7 D6 D5 D4 D3 D2 D1 D0
Function X CLKOUT CLKIN SR3 SR2 SR1 SR0 BOSR USB/Normal
Default 0 0 0 0 0 0 0 0 0
CLKOUT Clock output divider 0 = MCLK 1 = MCLK/2
CLKIN Clock input divider 0 = MCLK 1 = MCLK/2
SR[3:0] Sampling rate control (see Sections 3.3.2.1 AND 3.3.2.2)
BOSR Base oversampling rate
USB mode: 0 = 250 f
s
1 = 272 f
s
Normal mode: 0 = 256 f
s
1 = 384 f
s
USB/Normal Clock mode select: 0 =Normal 1 = USB
X Reserved
Digital Interface Activation (Address: 0001001)
BIT D8 D7 D6 D5 D4 D3 D2 D1 D0
Function X X X X X X X X ACT
Default 0 0 0 0 0 0 0 0 0
ACT Activate interface 0 = Inactive 1 = Active
X Reserved
Reset Register (Address: 0001111)
BIT D8 D7 D6 D5 D4 D3 D2 D1 D0
Function RES RES RES RES RES RES RES RES RES
Default 0 0 0 0 0 0 0 0 0
RES Write to this register triggers reset
3.2 Analog Interface
3.2.1 Line Inputs
The TLV320DAC23 has line inputs for the left and the right audio channels (RLINEIN and LLINEIN). Both line inputs
have independently programmable mutes. Active and passive filters for the two channels prevent high frequencies
from folding back into the audio band.