AK4490 Datasheet, PDF (41/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490]
■ Zero Detection (PCM, DSD)
The AK4490 has a channel-independent zeros detect function. When the input data at each channel is
continuously zeros for 8192 LRCK cycles, the DZF pin of each channel goes to “H”. The DZF pin of each
channel immediately returns to “L” if the input data of each channel is not zero after going to “H”. If the RSTN
bit is “0”, the DZF pins of both L and R channels go to “H”. The DZF pin of each channel returns to “L” in 4 ~
5/fs after the input data of each channel becomes “1” when RSTN bit is set to “1”. If DZFM bit is set to “1”, the
DZF pins of both L and R channels go to “H” only when the input data for both channels are continuously
zeros for 8192 LRCK cycles. The zero detect function can be disabled by setting the DZFE bit. In this case,
DZF pins of both channels are always “L”. The DZFB bit can invert the polarity of the DZF pin.
DZFE DZFB
Data
DZF-pin
0
-
L
0
1
-
H
not zero
L
0
Zero detect
H
1
not zero
H
1
Zero detect
L
Table 25. Zero Detect Function and DZF Pin Output
■ Mono Output (PCM, DSD, EX DF I/F)
The AK4490 can select input/output for both output channels by setting the MONO bit and SELLR bit. This
function is available for any audio format.
MONO bit
0
0
1
1
SELLR bit
Lch Out
0
Lch In
1
Rch In
0
Lch In
1
Rch In
Table 26 MONO Mode Output Select
Rch Out
Rch In
Lch In
Lch In
Rch In
■ Sound Quality Control (PCM, DSD, Ex DF I/F)
Sound quality of the AK4490 can be selected by SC1-0 bits.
SC1
SC0
Mode
0
0
Sound Setting 1
0
1
Sound Setting 2
1
0
Sound Setting 3
1
1
Reserved
Table 27. SC1-0 bits Control
(default)
MS1648-E-03
- 41 -
2014/11