AK4490EN Datasheet, PDF (42/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490EN]
■ Zero Detection (PCM, DSD, EX DF I/F)
The AK4490EN 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.
Table 26. Zero Detect Function and DZF Pin Output
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
■ Mono Output (PCM, DSD, EX DF I/F)
The AK4490EN 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
Table 27 MONO Mode Output Select
SELLR bit
Lch Out
0
Lch In
1
Rch In
0
Lch In
1
Rch In
Rch Out
Rch In
Lch In
Lch In
Rch In
■ Sound Quality Control (PCM, DSD, Ex DF I/F)
Sound quality of the AK4490EN can be selected by SC1-0 bits.
Table 28. SC1-0 bits Control
SC1
SC0
Mode
0
0
Sound Setting 1
0
1
Sound Setting 2
1
0
Sound Setting 3
1
1
Reserved
(default)
015013666-E-01
- 42 -
2015/12